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Journal articles on the topic "IMTA"
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Hossain, Amir, Paula Senff, and Marion Glaser. "Lessons for Coastal Applications of IMTA as a Way towards Sustainable Development: A Review." Applied Sciences 12, no. 23 (November 22, 2022): 11920. http://dx.doi.org/10.3390/app122311920.
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Integrated multi-trophic aquaculture (IMTA) systems integrate the cultivation of species from different trophic levels. Uneaten feed, solid wastes, and dissolved nutrients are turned into harvestable and healthy food, making IMTA a driver for ecologically sustainable aquaculture. Its wider sustainability potentials arise from social, environmental, and economic sustainability enhancement options. Biological and economic outcomes are promising, while social equity and acceptance remain to be further investigated in the context of the long-term viability of aquaculture. Sustainable coastal and marine aquaculture development requires a holistic approach that involves social/cultural, economic, as well as environmental sustainability. This article examines IMTA as a pathway to socially, environmentally, and economically sustainable development. We collate evidence that shows that IMTA can minimize the negative environmental effects of aquaculture, assist local economies, and boost competitiveness and long-term economic viability. Available analyses of socio-economic and cost-effectiveness reveal positive prospects for IMTA systems, through product diversification, faster production cycles, and IMTA product prices and show a divergence between financial returns at the level of the entrepreneurial unit and economic returns at the macro level, which inhibits the uptake of IMTA. We conclude that the lack of governance analysis or inappropriateness of institutional development, in terms of aquaculture governance and management laws and regulations, is at the core of the hitherto weak engagement with IMTA. Unsuitable policies, regulations, and public and private sector decision policies and implementation, underlined by the scarcity of analyses of aquaculture governance institutions, are part of the reason for this. The evidence we have aggregated indicates that the relative scarcity of commercially successful coastal IMTA undertakings is not so much an intrinsic feature of the IMTA approach but is likely to have been generated by missing or inappropriate governance structures and procedures in the coastal realm.
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Radiarta, I. Nyoman, and Erlania Erlania. "PERFORMA KOMODITAS BUDIDAYA LAUT PADA SISTEM INTEGRATED MULTI-TROPHIC AQUACULTURE (IMTA) DI TELUK GERUPUK, LOMBOK TENGAH, NUSA TENGGARA BARAT." Jurnal Riset Akuakultur 11, no. 1 (October 5, 2016): 85. http://dx.doi.org/10.15578/jra.11.1.2016.85-97.
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<p>Budidaya laut berbasis Integrated Multi-Trophic Aquaculture (IMTA) merupakan opsi pengembangan budidaya perikanan yang sejalan dengan konsep pelestarian lingkungan. Tujuan penelitian ini adalah menganalisis performa komoditas budidaya laut yang pada sistem integrated multi trophic aquaculture (IMTA). Penelitian dilaksanakan di Teluk Gerupuk, Lombok Tengah, Nusa Tenggara Barat, pada bulan Juni-November 2015. Model IMTA yang dikembangkan adalah kombinasi antara ikan kerapu macan (<em>Epinephelus</em> <em>fuscoguttatus</em>), ikan bawal bintang (<em>Trachinotus blochii</em>, Lacepede), dan rumput laut (<em>Kappaphycus</em> <em>alvarezii</em>). Hasil penelitian menunjukkan bahwa selama 150 hari masa pemeliharaan ikan kerapu dan bawal bintang menghasilkan pertumbuhan yang baik, dengan rata-rata bobot akhir ikan kerapu sebesar 173,45 ± 36,61 g/ekor; dan<br />ikan bawal bintang sebesar 161,27 ± 30,05 g/ekor. Pertumbuhan rumput laut selama tiga siklus menunjukkan bahwa siklus pertama (Juni-Juli) dan siklus kedua (Agustus-September) menghasilkan pertumbuhan yang lebih baik dibandingkan dengan siklus ketiga (Oktober–November). Laju pertumbuhan harian rumput laut di sekitar keramba jarring apung (KJA) ikan sebesar 4,22%-6,09%/hari lebih tinggi dibandingkan dengan kontrol (jarak 2-3 km dari KJA ikan) yaitu 3,90%-5,53%/hari. Hasil dari penelitian ini menunjukkan efektivitas sistem IMTA dalam hal peningkatan produktivitas budidaya rumput laut. Model IMTA dapat diterapkan sebagai model pengembangan budidaya laut yang berwawasan lingkungan melalui peningkatan produksi, sistem produksi bersih, dan berkelanjutan.</p><p>Mariculture activity with Integrated Multi-Trophic Aquaculture (IMTA) is an aquaculture development technique which in line with environment conservation concept. This study was aimed to analyze perfomance of mariculture commodities that cultured under integrated multi-trophic aquaculture (IMTA) system. The study was conducted in Gerupuk Bay, Central Lombok, West Nusa Tenggara during June-November 2015. The IMTA model was combined between tiger grouper fish (Epinephelus fuscoguttatus), silver pompano fish (Trachinotus blochii, Lacepede), and seaweed (Kappaphycus alvarezii). The result showed that during 150 days of cultured periods, both of grouper and pompano indicated a good growth performance, with mean body weight at the end of culture period about 173.45 ± 36.61 g/ind. and 161.27 ± 30.05 g/ind., respectively. Seaweed growth performance from three cultivation cycles showed that cycle-1 (June- July) and cycle-2 (August-September) had better growth performance than cycle-3 (October November). Daily growth rate of seaweed that cultured near fish cages was higher (4.22%-6.09%) than control, 2-3 km distance to fish cages (3.90%-5.53%). This study indicated the effectiveness of IMTA system to increase seaweed culture production. IMTA model can be applied as development model of mariculture with environmental concept through production enhancement, zero waste production, and sustainability.</p>
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Nederlof, MAJ, J. Fang, TG Dahlgren, SPS Rastrick, AC Smaal, Ø. Strand, H. Sveier, MCJ Verdegem, and HM Jansen. "Application of polychaetes in (de)coupled integrated aquaculture: an approach for fish waste bioremediation." Aquaculture Environment Interactions 12 (September 3, 2020): 385–99. http://dx.doi.org/10.3354/aei00371.
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Development of benthic components within integrated multi-trophic aquaculture (IMTA) systems warrants more attention, and the development of polychaetes as an extractive component in IMTA systems is ongoing. This study estimates the bioremediation potential of Capitella sp. and Ophryotrocha craigsmithi for coupled and decoupled salmon-driven IMTA. In coupled IMTA, polychaetes receive fresh faeces, while in decoupled IMTA, preservation of faeces is applied. Respiration and ammonia excretion rates were measured for polychaetes fed fresh, oven-dried or acidified salmon faeces, and combined with nutrients incorporated into tissue growth, to estimate nutrient requirements. Nutrient requirements were subsequently used to evaluate bioremediation potential. Metabolic rates were highest for O. craigsmithi and contributed notably to their overall nutrient requirement (20-30%). For the 2 polychaete species, nutrient requirements ranged from 5 to 26 mg C and from 2 to 6 mg N g-1 AFDW d-1. These requirements were comparable with or higher than other polychaete species, highlighting the potential for fish waste bioremediation by Capitella sp. and O. craigsmithi. Preserved diets reduced bioremediation potential 1.5 and 3-5 times for, respectively, Capitella sp. and O. craigsmithi. Assuming that polychaetes are efficient fish-faeces convertors, the bioremediation potential indicates that benthic cultivation units containing 65000-95000 ind. m-2 of Capitella sp. or 36000-194000 ind. m-2 of O. craigsmithi can convert the daily organic waste flux deposited below an average salmon farm. These densities were within ranges reported for wild populations, indicating that, based on the bioremediation potential, development of benthic IMTA with these 2 polychaete species seems realistic and efficient for waste conversion.
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Resende, Luís, Juan Flores, Cláudia Moreira, Diana Pacheco, Alexandra Baeta, Ana Carla Garcia, and Ana Cristina Silva Rocha. "Effective and Low-Maintenance IMTA System as Effluent Treatment Unit for Promoting Sustainability in Coastal Aquaculture." Applied Sciences 12, no. 1 (December 31, 2021): 398. http://dx.doi.org/10.3390/app12010398.
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Integrated multitrophic aquaculture (IMTA) is a versatile technology emerging as an ecological and sustainable solution for traditional monoculture aquacultures in terms of effluent treatment. Nevertheless, IMTA is still poorly applied in aquaculture industry due to, among other reasons, the lack of effective, low-investment and low-maintenance solutions. In this study, one has developed a practical and low maintenance IMTA-pilot system, settled in a semi-intensive coastal aquaculture. The optimisation and performance of the system was validated using Ulva spp., a macroalgae that naturally grows in the fishponds of the local aquaculture. Several cultivation experiments were performed at lab-scale and in the IMTA-pilot system, in static mode. The specific growth rate (SGR), yield, nutrient removal, N and C enrichment, protein and pigment content were monitored. Ulva spp. successfully thrived in effluent from the fish species sea bream (Sparus aurata) and sea bass (Dicentrarchus labrax) production tanks and significantly reduced inorganic nutrient load in the effluent, particularly, NH4+, PO43− and NO3−. The enrichment of nitrogen in Ulva spp.’s tissues indicated nitrogen assimilation by the algae, though, the cultivated Ulva spp. showed lower amounts of protein and pigments in comparison to the wild type. This study indicates that the designed IMTA-pilot system is an efficient solution for fish effluent treatment and Ulva spp., a suitable effluent remediator.
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Nurfadillah, Nurfadillah, Iwan Hasri, Muhammad Reza Purnama, Adrian Damora, and Siska Mellisa. "The application of integrated multi-trophic aquaculture (IMTA) using floating net cages on Tilapia fish with native fish (Peres, Lemeduk, and Depik)." Depik 10, no. 3 (November 18, 2021): 219–24. http://dx.doi.org/10.13170/depik.10.3.22465.
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Environmental problems due to aquaculture occur along with the increase in aquaculture production. IMTA is one system used as a solution in dealing with environmental problems. The objective of this study was to analyze the growth performance, survival rate, and production of the main commodity (tilapia) and the supporting commodities (Peres, Lemeduk, and Depik) which are applied through the application of integrated multi-trophic aquaculture (IMTA) using floating net cages. This research was conducted at the Lukup Badak Fish Seed Center, Central Aceh from July to August 2020. The experimental design used was a completely randomized design (CRD) with 4 treatments and 3 replications, namely: A (tilapia), B (tilapia and peres), C (tilapia and lemeduk), and D (tilapia and depik). ANOVA test results showed that the IMTA system had a significant effect on absolute length growth, absolute weight growth, specific growth rate (SGR), survival rate, and biomass production of tilapia (P0.05). The results showed that maintenance for 42 days produced the highest value in treatment B with the increase in absolute length growth (4.26cm±0.24); absolute weight growth (5.47g±0.45), specific daily growth rate (2.28%/day±0.13) and the highest tilapia biomass production (480g/0.5m2±19.25). The highest survival rate was found in treatment C (82.42%±2.28). It was concluded that the treatment using the IMTA system was better than without the IMTA system.Keywords:IMTAWater qualityGrowth performanceTrophic interactionBiomass production
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Bouwmans, Clazien, Marieke Krol, Hans Severens, Marc Koopmanschap, Werner Brouwer, and Leona Hakkaart-van Roijen. "The iMTA Productivity Cost Questionnaire." Value in Health 18, no. 6 (September 2015): 753–58. http://dx.doi.org/10.1016/j.jval.2015.05.009.
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Bouwmans, C., M. Krol, W. Brouwer, J. L. Severens, M. A. Koopmanschap, and L. Hakkaart. "IMTA Productivity Cost Questionnaire (IPCQ)." Value in Health 17, no. 7 (November 2014): A550. http://dx.doi.org/10.1016/j.jval.2014.08.1791.
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Anggorowati, D. A., and H. Munandar. "Diversity and fluctuation of cultivable Vibrio bacteria populations in an integrated multi-trophic aquaculture (IMTA) system of Holothuria scabra, Chanos chanos and Gracillaria sp." IOP Conference Series: Earth and Environmental Science 967, no. 1 (January 1, 2022): 012008. http://dx.doi.org/10.1088/1755-1315/967/1/012008.
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Abstract Sea cucumber is one of the vital aquaculture commodities in the global market. Progressive demand and limiting the supply of sea cucumber from natural sources drove sea cucumber aquaculture development. An integrated multi-trophic aquaculture system (IMTA) was a polyculture system in aquaculture to improve production by promoting nutrient utilisation through different tropical levels. This system combined sea cucumber (Holothuria scabra), milkfish (Chanos chanos), and seaweed (Gracillaria sp.) in a rearing tank system. Several factors affect the success of IMTA processes, including microorganisms. Microorganisms in the aquaculture environment play a crucial role in elements cycling, energy flow and farmed-species health. Diseases caused by the bacteria, mainly from the Vibrionaceae family, were often chronic than acute and may cause a high mortality percentage. This study aimed to investigate the Vibrio bacterial diversity and fluctuation in the water of IMTA rearing tanks. The result indicated that the Vibrio bacterial diversity from the polyculture system (IMTA) was generally higher than the monoculture system. Vibrio bacteria populations from different culture systems have been found to consist of varied bacterial species. However, the predominant species was the same. The polyculture system is suggested as a sustainable and eco-friendly culture system.
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Nasti, Diana, S. Sunarno, and Sapto Purnomo Putro. "Analisa Hubungan Panjang dengan Berat Ikan Bawal Bintang (Trachinotus Blochii, Lacepede) Pada Sistem Keramba Jaring Apung (KJA) Integrated Multi Trophic Aquaculture (IMTA) di Kawasan Sea Farming Kepulauan Seribu." Bioma : Berkala Ilmiah Biologi 19, no. 1 (July 13, 2017): 1. http://dx.doi.org/10.14710/bioma.19.1.1-4.
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Tujuan penelitian ini adalah menganalisa hubungan panjang dan berat ikan bawal bintang (Trachinotus blochii) pada sistem keramba jaring apung (KJA) Integrated multi trophic aquaculture (IMTA) dan Monokultur. Keramba jaring apung IMTA diaplikasikan pada Stratified double net cage (SDNC). Penelitian ini dilakukan di kawasan Sea Farming Karang Lebar kepulauan Seribu, di dua lokasi yaitu : lokasi A adalah kawasan budidaya sistem IMTA dengan jenis biota ikan bawal bintang (Trachinotus blochii) dan ikan kerapu macan (Epinephelus fuscoguttatus,Forsskal). Lokasi B adalah kawasan budidaya monokultur dengan jenis biota bawal bintang (Trachinotus Blochii). Hasil penelitian analisa hubungan panjang dan berat ikan di kedua lokasi menunjukan pola alometrik positif b > 3, dan berdasarkan kondisi fisik dan kimia perairan laut dari kedua lokasi penelitian terdapat perbedaan namun, secara umum masih menunjukkan dalam kisaran normal yaitu konduktivitas berkisar antara 4,53 – 5,05 mS/cm, kecerahan berkisar antara 23,21 – 25,50 mg/l, turbiditas berkisar antara 19,89 – 27,00 mg/l, Dissolved Oxygen (DO) berkisar pada 6,09 – 7,50 mg/L, salinitas berkisar antara 25,09 – 32,37ppt, pH berkisar antara 7,21 – 7,96 dan temperatur berkisar antara 29,33 – 31,40 oC. Kata kunci : Bawal bintang (Trachinotus blochii), IMTA, Monokultur, pola pertumbuhan
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Dewi, Asriani Atika, Sri Rejeki, and Titik Susilowati. "PENGARUH KEPADATAN UDANG WINDU YANG BERBEDA PADA KONSEP IMTA (INTEGRATED MULTITROPHIC AQUACULTURE) TERHADAP RASIO C/N DALAM MEDIA AIR BUDIDAYA." Sains Akuakultur Tropis 4, no. 2 (October 1, 2020): 148–55. http://dx.doi.org/10.14710/sat.v4i2.6876.
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Budidaya udang windu dengan sistem IMTA yaitu mengkombinasikan dua atau tiga komoditas budidaya, dimana limbah nutrisi/pakan dari hewan tingkat tinggi dikonsumsi oleh hewan tingkat rendah. Budidaya sistem IMTA saat ini belum banyak diketahui nilai C/N dalam memenuhi persyaratan yang optimal. Bakteri heterotrof di perairan akan tumbuh dengan baik apabila rasio C/N bernilai 10 atau lebih. Oleh karena itu, perlu dilakukan analisis rasio C/N dalam air pada budidaya dengan sistem IMTA (Integrated Multitrophic Aquaculture). Penelitian ini bertujuan untuk mengetahui pengaruh kepadatan udang windu terhadap rasio C/N dalam air dan mengetahui kepadatan udang windu yang optimal untuk menghasilkan rasio C/N pada lingkungan budidaya. Udang windu dengan stadia PL-30 (0.092±0,84 cm) dibudidayakan pada sistem IMTA dengan menggunakan ikan nila dengan kepadatan 20 ekor/m3 (0.69±0,3 cm), rumput laut dengan kepadatan 100 g/m2 dan kerang hijau dengan kepadatan 90 g/m2 (3,32±0,79 cm). Pakan udang windu yang digunakan memiliki kandungan protein 40% dengan metode pemberian pakan secara fix feeding rate. Pakan ikan nila yang digunakan memiliki kandungan protein 30% dengan metode pemberian pakan yang diberikan secara ad satiation. Wadah yang digunakan adalah menggunakan bak fiber dengan ukuran panjang 1 m2dan lebar 1 m2dan kedalaman air 0,7 m2. Media yang digunakan untuk membuat sebuah ekosistem yang menyerupai ekosistem tambak ditambahkan substrat berupa pasir berlumpur. Substrat berupa lumpur berpasir mengacu pada penelitian. Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap (RAL) 4 perlakuan dan 3 ulangan. Kepadatan yang digunakan yaitu perlakuan A (tanpa udang), B (60), C (80), dan D (100). Data yang diamati adalah rasio C/N, laju pertumbuhan spesifik (SGR) dan kelulushidupan (SR). Hasil penelitian menunjukkan bahwa kepadatan udang windu yang berbeda pada sistem IMTA berpengaruh (P<0,05) terhadap kelulushidupan tetapi tidak berpengaruh terhadap rasio C/N dan laju pertumbuhan spesifik. Perlakuan kepadatan udang windu 60, 80 dan 100 ekor mempunyai hasil rasio C/N yang baik dalam persyaratan rasio C/N air.Kata Kunci : IMTA, Kepadatan, Rasio C/N, Udang windu.
Dissertations / Theses on the topic "IMTA"
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Reis, Mariana Pereira. "Estudo do perfil lipídico da alga Grateloupia turuturu cultivada em IMTA." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22416.
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Mestrado em Bioquímica - Bioquímica AlimentarAs algas são consideradas uma das mais promissoras e sustentáveis fontes de biomassa sendo utilizadas na industria alimentar, farmacêutica, cosmética e de biocombustíveis. O interesse crescente na comercialização de algas, levou ao desenvolvimento de várias técnicas de algicultura. Atualmente a técnica de aquacultura multitrófica integrada (IMTA) tem ganho destaque uma vez que propõe a integração de vários níveis tróficos no mesmo sistema de aquacultura permitindo a mitigação da libertação do desperdício da aquacultura, aumentando a produtividade dos organismos extrativos, como é ocaso das algas. Neste sentido, a empresa ALGAPlus elegeu esta técnica sustentável para a produção de diversas algas presentes na costa portuguesa. A Grateloupia turuturu é uma alga vermelha comestível com alto valor nutritivo. É uma espécie não nativa da costa Portuguesa, de caráter não invasivo, com potencial para comercialização na área alimentar e farmacêutica. Assim este trabalho de mestrado teve como objetivos: a avaliação do potencial de cultivo de G. turuturu num sistema experimental IMTA, tendo em conta a influência do estado reprodutivo da alga; a comparação da composição bioquímica de G. turuturu de cultivo com a alga recolhida nas populações selvagens da Ria de Aveiro, aprofundando a composição lipídica da alga através da análise de ácidos gordos (AG) e lípidos polares através de uma abordagem lipidómica e a determinação da atividade antioxidante do extrato lipídico da G. turuturu selvagem e de cultivo. A alga foi cultivada num sistema experimental em IMTA na empresa ALGAplus onde foi feito um estudo preliminar para avaliar a taxa de crescimento e a produtividade de duas fases do seu ciclo de vida (reprodutiva e não reprodutiva). A composição bioquímica da biomassa resultante foi estudada quanto ao teor de lípidos, proteína, cinzas e fibra. A fração lipídica foi extraída com clorofórmio/metanol e analisada em termos de AG metilestrificados por GC-MS e em termos de lípidos polares por HPLC-MS. A atividade antioxidante do extrato lipídico foi avaliada pelo método do DPPH. De um modo geral, verificou-se que a alga cresceu no sistema de cultivo em ambas as fases do ciclo de vida, contudo a alga reprodutiva apresentou uma maior produtividade. Em termos de composição bioquímica a G. turuturu apresentou uma grande percentagem de proteínas e fibra e baixo teor em lípidos e cinzas. Observou-se que de um modo geral a G. turuturu apresar de apresentar um baixo teor de lípidos contém uma elevada quantidade de PUFA apresentando um rácio n-6/n-3 abaixo de 1. Foi caracterizado pela primeira vez o perfil de lípidos polares da G. turuturu em que foram identificadas 64 espécies correspondendo a glicolípidos (sulfoquinovosildiacilgliceróis, sulfoquinovosilmonoacilgliceróis, di- e monogalactosildiacilgliceróis), glicerofosfolípidos (liso- e fosfatidicolinas, ácidos fosfatídicos, liso- e fosfatidilgliceróis e fosfatidiletanolamina) e di- e monoacil betaínas. Adicionalmente, o extrato lipídico demonstrou atividade antioxidante. Desta forma, este estudo permitiu evidenciar a composição de G. turuturu cultivada em IMTA de modo a valorizar esta alga como um produto alimentar e como fonte de compostos bioativos. No entanto são necessários estudos posteriores para validar estes resultados
Algae are one of the most promising and sustainable sources of biomass for a wide variety of products. Currently, algae can be consumed directly by humans or used in animal nutrition, food additives, fertilizers, biofuel, cosmetics, and medicine. The growing interest in the commercialization of algae has led to the development of various techniques of algiculture. Currently, the integrated multitrophic aquaculture technique (IMTA) has gained popularity since it proposes the integration of several trophic levels in the same aquaculture system, thus, allow the mitigation of the aquaculture waste. Therefore, the company AlgaPlus chose this sustainable technique for the production of several algae present on the portuguese coast. Grateloupia turuturu is an edible red seaweed with high nutritional value originating in Japan and has dispersed along the Atlantic coast including Portugal. It is a non-native species with potential for commercialization in the food and pharmaceutical industries. Thus, this work has different aims: an evaluation of the cultivation potential of G. turuturu in an experimental IMTA system, taking into account the influence of the life cycle phase of the seaweed; comparison of the biochemical composition of cultivated G. turuturu and the wild populations of the Ria de Aveiro; analysis of fatty acids (AG) and polar lipids through a lipidomic approach and determination of antioxidant activity of lipid extract of the G. turuturu wild and cultivated. The algae were grown in an experimental system at IMTA at the company ALGAplus where the growth rate and productivity of two stages of its cycle (reproductive and non-reproductive) were evaluated. The biochemical composition was studied for the lipid, protein, ash and fiber content. The lipid fraction was extracted with chloroform/methanol. The fatty acid methyl ester was analyzed by GC-MS and the polar lipids by HPLC-MS. The antioxidant activity of the lipid extract was evaluated by the DPPH method. Generally, it was found that algae grew in aquaculture system in both life-cycle phases, however, the reproductive alga exhibits higher productivity. The biochemical composition of G. turuturu presented a high percentage of proteins and fiber and low lipids and ashes. It was observed that the G. turuturu exhibit low lipid content, however, contains a high amount of PUFA resulting in an n-6/n-3 ratio below 1. It was characterized for the first time the polar lipid profile of G. turuturu, 65 species of glycolipids (sulfoquinovosyldiacylglycerols, sulfoquinovosylmonoacylglycerools, di- and monogalactosyldiacylglycerols), glycerophospholipids (lyso- and phosphatidylcholine, phosphatidic acids, lyso- and phosphatidylglycerols and phosphatidylethanolamine) and di- and monoacyl betaines lipids were identified. Additionally, the lipid extract showed antioxidant activity. In this way, this study contributes to the valorisation of G. turuturu cultivated in IMTA as a food product and as a source of bioactive compounds. However, further studies are necessary to validate these results.
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Näsström, Leo. "Concerning the Viability of Offshore Integrated Multi-Trophic Aquaculture (IMTA), and the Possibility for its Optimization." Thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-183511.
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Ett stagnerat globalt fiske har lett till en snabb utökning av vattenbruket för att tillgodose den globala marknaden. Traditionellt vattenbruk har i västvärlden kännetecknats av monospecifika odlingar, ofta med mycket grav påverkan på sin omnejd. Ett återupptäckt alternativ till denna i längden ohållbara tappning av vattenbruk har därför växt fram. Integrerad multi-trofiskt vattenbruk (IMTA) är en teknik som, genom att odla organismer från flera trofiska nivåer tillsammans, kan minska utsläppen och öka produktiviteten hos en odling. En växande global befolkningen kommer dock leda till ökande konflikter mellan kustnära vattenbruk och intressenter såsom industrier, myndigheter och privatpersoner. Då vattenbruket fortsätter att växa skulle en lösning på dessa konflikter vara att rikta dess expansion mot det öppna havet. Frågan är då om IMTA vore effektivt utomskärs och hur det i så fall skulle kunna optimeras ur både produktions- och kostnadsperspektiv. Denna undersökning tyder på att en pelagial expansion skulle ge en positiv påverkan av de olika ekologiska, ekonomiska och infrastrukturella aspekter rörande utomskärs-IMTA. Dock kräver en sådan förflyttning omfattande förarbete i utvärdering av lämpliga lokaler. En analys av olika arter och dess egenskaper, monetära värde, tillika möjligheter att optimera systemet visar på att utomskärs IMTA är möjligt, men begränsas av ingenjörsmässiga faktorer.The stagnated global fishing has led to a fast expansion of aquaculture to meet the increasing global demand for seafood. Traditionally aquaculture in the western world has been defined as large monospecific cultures, often with grave implications on its surrounding environment. An alternative to the conventional and unsustainable method has thus been rediscovered and developed. Integrated Multi-Trophic Aquaculture (IMTA) is a technique that, by cultivating organisms of different trophic levels together, can decrease effluents and increase the productivity of a farm. Furthermore, the growing global population will lead to increasing conflicts between coastal aquaculture and other stakeholders such as industries, governments, and private citizens. Since aquaculture continues to grow, a possible solution to such conflicts could be an offshore expansion of aquaculture. However, whether an IMTA system still would be effective in an offshore setting is unclear. This is also the case regarding the possibility to optimize an offshore IMTA system concerning productivity and investment costs. The present article shows that a pelagic expansion of IMTA would positively affect the ecological, economical and infrastructural aspects regarding offshore IMTA compared to inshore IMTA. However, such a transposition would require comprehensive preparatory evaluations of suitable sites. An analysis of several species and their attributes, monetary value, and capability of optimizing the system indicates that offshore IMTA is possible but is limited by structural-engineering factors.
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Lamprianidou, Fani. "Development of a model for evaluating and optimizing the performance of integrated multitrophic aquaculture (IMTA) systems." Thesis, University of Stirling, 2015. http://hdl.handle.net/1893/22916.
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Earth’s population is expected to reach 9 billion by 2050. Ensuring food security for the growing world population is one of today’s society’s major challenges and responsibilities. Aquatic products have the potential to contribute significantly in the growing population’s dietary requirements. Since increasing the pressure on most natural fish stocks is now widely agreed not to be an option, the aquaculture sector needs to grow. The challenge is to increase aquaculture production without depleting natural resources or damaging the environment but also in a financially sustainable way. Integrated Multitrophic Aquaculture (IMTA) is one method of sustainable aquatic production. Integrating bioremediatory organisms that extract particulate organic matter or dissolved inorganic nutrients with monocultures of fed species has the potential of reducing the particulate and soluble waste loads from effluents, whilst producing a low-input protein source that may also increase the farm income. IMTA is a viable solution for mitigating the environmental impact of waste released from fish farms. The fish waste is exploited as a food source for lower trophic, extractive organisms giving an added value to the investment in feed. Studies up to now have shown that under experimental conditions as well as in small-scale commercial studies, various filter-feeding, deposit-feeding and grazing species can ingest fish waste particles. The aim now is to achieve IMTA optimization, where extractive organisms can ingest most of the finfish waste food and excretions. Any such design is likely to be complex incorporating a multidisciplinary approach, and therefore to date a reason why most studies have failed to prove the environmental and economic benefits of IMTA. Consequently, the aim of this study is to develop ways of selecting an ideal combination of species for a specific locality, manage the cultures in a way that ensures the maximum nutrient recycling feasible per unit of area; and ensure high growth rate of the extractive organisms while being financially beneficial. The approach taken was a combination of investigative literature reviews, computer modelling work and small-scale growth trials to determine the relative growth of extractive organisms fed fishfeed and waste, followed by the development of a systems-based model of interaction and growth efficiency for combinations of organisms within an IMTA system. This study starts by investigating, with small-scale laboratory experiments, the potential of two organic extractive species, the lugworm, Arenicola marina and the sea urchin, Psammechinus miliaris, as organic extractive components of IMTA systems. Their ability to consume and assimilate salmon faeces was evaluated as well as their remediation efficiency. This was done by comparing the carbon, nitrogen and phosphorus content of the pellet-faeces mixture to that of the sea urchin faeces and sea urchin gonad content. Their growth, gonadosomatic index (GSI) (for the sea urchins), tissue carbon, nitrogen and phosphorous content were compared between seaweed diets and a diet consisting of a mixture of salmon faeces and feed pellets. The results showed statistically significant gonad carbon content for the sea urchins fed with faeces. Similarly, statistically significant higher phosphorous content was found in the tissues of the lugworms fed with the mixture of salmon faeces and pellets than in the lugworms of the other two groups. The subsequent and main phase of this study was the development of a model for optimising IMTA performance. The modelling process included model development, run, optimization and risk assessment. The IMTA model developed consisted of Atlantic salmon Salmo salar, the sea urchin Paracentrotus lividus and the macroalgae Ulva sp. It simulates the growth as well as the uptake and release of nitrogen by these organisms under environmental conditions of a hypothetical site on the west coast of Scotland. The aim of the model was to maximize the potential of IMTA in terms of productivity and to reduce the amount of nutrients that are released in the environment, and thus to contribute towards a more sustainable and productive form of aquaculture. The IMTA model developed can be re-parameterised to simulate the growth and nutrient uptake of different species and the growth and nutrient uptake under different environmental conditions. This capacity of the model was used in order to do a comparative study of the nitrogen bioremediation potential of three different invertebrate species, cultivated as part of an IMTA. These species were the lugworm (Arenicola marina), the blue mussel (Mytilus edulis) and the purple sea urchin (Paracentrotus lividus). The results of this comparative study showed that weight for weight, M. edulis is more efficient in removing POM than P. lividus that is in turn better than A. marina with regard to the amount of nitrogen they can assimilate. But in terms of cultivation area required for the production of the same total biomass, P. lividus was better at removing POM followed by M. edulis and then by A. marina.
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Fróis, Filipa Alexandra Maçanita. "Aquacultura multi-trófica integrada em tanques de terra." Master's thesis, ISA/UL, 2017. http://hdl.handle.net/10400.5/13867.
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Mestrado em Engenharia Zootécnica - Produção Animal - Instituto Superior de Agronomia / Faculdade de Medicina Veterinária - ULEste trabalho teve como objetivo avaliar a produção em policultura de três sistemas multi-tróficos integrados em tanques de terra no concelho de Olhão, Parque Natural da Ria Formosa: S1 (peixes, ostras com macroalgas), S2 (peixes com ostras) e S3 (peixes com macroalgas) com as espécies de peixes corvinas (Argyrosomus regius) sargos (Diplodus sargus) e tainhas (Mugil cephalus), ostras (Crassostrea gigas) e macroalgas (Ulva spp.) utilizando principalmente como parâmetros a Taxa de Crescimento Específica (TCE) e a Taxa de Conversão Alimentar (TCA) de modo a averiguar o sistema mais eficiente para posteriormente calcular a sua rentabilidade. As corvinas de S2 apresentaram melhores pesos médios (366,5 ± 83,3 g) do que S1 e S3. No entanto, S1 apresentou um menor valor de TCA = 1,76 sendo mais eficiente do que S2 com TCA = 1,90 e S3 com TCA = 2,42. A sua TCE para S1 e S2 foi de 0,40% e para S3 foi de 0,31%. No caso dos sargos e tainhas, por questões de maneio e de bem-estar animal, os seus parâmetros de crescimento foram previstos e extrapolados. As ostras, em 93 dias de cultivo, apresentaram melhores TCE em S1 (4,06%/dia) do que em S2 (3,53%/dia) mas a sua sobrevivência foi baixa. A TCE da Ulva, colocada em estruturas flutuantes divididas em seis compartimentos, três deles com altas densidades de Ulva e outros três com baixas densidades, foi melhor em S3 do que em S1, e melhor em compartimentos de baixa densidade do que em compartimentos de altas densidades. A nova biomassa de Ulva produzida em 8 semanas nos tanques atingiu os 9,36 kg em S1 e os 10,24 kg em S3. Uma extrapolação foi feita com os resultados obtidos neste trabalho e com base em outros ensaios, verificando-se que o sistema integrado é viavelmente económico
N/A
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Assunção, Marcelo Henrique Correa [UNESP]. "Emissões de gases do efeito estufa em sistemas multitróficos de aquicultura." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/150932.
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
O objetivo deste estudo foi investigar o fluxo de gases do efeito estufa (GEE) em viveiros de criação de organismos aquáticos. Nós testamos se o uso de sistemas multitróficos e multiespaciais (IMTA), povoados com lambari-do-rabo-amarelo (Astyanax lacustris) e camarão-da-amazônia (Macrobrachium amazonicum) numa região tropical, altera o fluxo de gases do efeito estufa em comparação com um sistema de monocultivo de A. lacustris. Nós desenvolvemos um experimento em viveiros de fundo natural com três tratamentos e quatro réplicas: monocultivo (Tetra), IMTA livre (Free IMTA) e IMTA tanque rede (Cage IMTA). O experimento durou 68 dias, entre os meses de novembro e janeiro de 2016. Nós mensuramos os fluxos de dióxido de carbono (CO2), metano (CH4) e óxido nitroso (N2O) por meio das metodologias difusiva e dissolvida. A média dos fluxos na metodologia difusiva foi de -8.93 mg.m-2.h-1 para o CO2, -0.88 mg.m-2.h-1 para o CH4 e 1.78 mg.m-2.h-1 para o N2O. A concentração de CO2 variou de 0.0481 a 0.6668 mg.L-1, CH4 de 0.0003 a 0.0053 mg.L-1 e N2O de 0.0789 a 0.1177 mg.L-1. Nossos resultados indicam variação ao longo do tempo, com maior fluxo de GEE no início do experimento, diminuição ao longo do período de cultivo e tendência de neutralidade com relação a emissão de GEE no final do período experimental.
CNPq: 147409/2013-6
CNPq: 473199/2011-4
CNPq: 306361/2014-0
FAPESP: 2012/18593-5
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Blouin, Nicolas Achille. "Asexual Reproduction in Porphyra umbilicalis (L.) Kützing and Assessment of its Use in Integrated Multi-trophic Aquaculture (IMTA)." Fogler Library, University of Maine, 2006. http://www.library.umaine.edu/theses/pdf/BlouinNA2006.pdf.
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Lopes, Galasso Helena. "Bioremédiation des rejets de poissons par un polychète détritivore en vue d’un système aquacole intégré multi-trophique." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTG013.
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Les systèmes intégrés d’aquaculture multi-trophique (IMTA) proposent de limiter les rejets dans l’environnement en associant la culture d’espèces de niveaux trophiques différents et le recyclage des déchets. Les détritivores sont un groupe trophique intéressant car ils permettent l’extraction de matière organique particulaire. Hediste (Nereis) diversicolor est un polychète qui connait un intérêt croissant du fait de sa capacité de bioturbation dans les sédiments et de sa haute valeur commerciale en tant qu’appât et nourriture potentielle pour animaux. L’objectif principal de cette thèse est d’évaluer le potentiel d’ H. diversicolor dans la bio-remédiation des rejets solides en système IMTA. Plus spécifiquement, l’étude a eu pour objectifs : i) de calibrer une nouvelle méthode de mesure des composés organiques des rejets (azote, carbone, phosphore, lipides), ii) d’évaluer l’activité métabolique (respiration) d’H. diversicolor nourries aux fèces de Dicentrarchus labrax en fonction de leur taille et de différentes températures, et iii) d’utiliser un modèle bioénergétique pour simuler croissance, respiration et excrétion d’H. diversicolor selon différents scenarios IMTA.Pour obtenir une caractérisation rapide des composés organiques, une méthode novatrice (NIRS) a été calibrée. Les composés des rejets ont varié entre 44-77% de matière organique, 2-5% d’azote organique total, 11-51% de carbone organique total, 9-26 de rapport carbone/azote, 1-3% phosphore total and 2-12% de lipides (% de matière sèche).Les taux métaboliques de H. diversicolor nourries aux fèces ont été estimés par consommations d’oxygène à différentes températures (11, 17, 22 and 27°C). Les effets de la température et de la taille du ver sur les consommations en oxygène ont été significatifs, mais ces niveaux de respiration (12.3 µmol g-1 de poids sec h-1 à 20°C) correspondaient probablement à un métabolisme basal dû aux conditions expérimentales (jeun et obscurité).Les simulations du modèle DEB H. diversicolor ont été comparées aux données expérimentales de taux de croissance, de respiration et d’excrétion, ce qui a permis de corroborer les prédictions du modèle. Le modèle DEB a permis de tester différents scenarios pour prédire les réponses métaboliques, la croissance, la maturité et la reproduction d’ H. diversicolor à différentes températures (5 à 25°C) et disponibilité alimentaire (f variant de 0.5 à 1, correspondant à la disponibilité des fèces). Le modèle DEB s’est avéré être un outil utile pour prédire les réponses physiologiques sous différentes conditions environnementales dans un contexte IMTAIntegrated Multi-Trophic Aquaculture (IMTA) systems are based on the concept of limiting aquaculture discharges associating species of different trophic levels to reuse wastes. Deposit-feeders are one trophic group that has gained attention for the extraction of particulate organic matter. Hediste (Nereis) diversicolor is a polychaete species that has gained increasing interest for its bioremediation capacity through bioturbation activity in sediments, and high commercial value as fish bait and animal food sources. The main objective of this thesis was to evaluate the fish waste bioremediation capacity of polychaete H. diversicolor in IMTA context. More specifically, i) to predict organic compounds (nitrogen, carbon, phosphorus, lipids) in marine fish waste, ii) to evaluate the metabolic responses - respiration - of H. diversicolor fed with solid waste of seabass Dicentrarchus labrax at different temperatures and body size, and iii) to use a bioenergetic model (DEB) to simulate growth, oxygen consumption and excretion in different IMTA scenarios.To provide fast characterization of organic compounds we used an innovative method based on near infrared reflectance spectroscopy (NIRS). Chemical content of the waste measured by NIRS models after calibration, ranged from 44-77% organic matter, 2-5% total organic nitrogen, 11-51% total organic carbon, 9-26 carbon/nitrogen ratio, 1-3% total phosphorus and 2-12% lipids (% of dry matter).Fish waste fed H. diversicolor metabolic rates were evaluated through oxygen consumption at different temperatures (11, 17, 22 and 27°C). The effect of temperature and worm body size was significant on oxygen consumptions, however these respiration measures (12.3 µmol g-1 of dry weight h-1 at 20°C) may represent basal metabolic rate due to experimental conditions (starvation, darkness).DEB model of H. diversicolor was compared to experimental data on growth, respiration and excretion rates, which corroborated DEB model predictions. DEB was then applied to test different scenarios predicting metabolic responses, growth, maturity and reproduction of H. diversicolor at different temperatures (5 to 25°C) and food levels (f varying from 0 to 1, corresponding to fish waste loading). DEB revealed to be a useful tool in IMTA context, predicting physiological responses in different environmental conditions
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Fernandez-Gonzalez, Victoria. "Fouling amphipods on marine aquaculture facilities: ecological interactions and potential applications and potential applications." Doctoral thesis, Universidad de Alicante, 2017. http://hdl.handle.net/10045/89091.
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Aquaculture facilities involve mooring a large amount of artificial structures in offshore areas, which are colonised by a wide group of marine organisms, forming characteristic fouling communities. Many studies have focused on determining what sessile organisms are able to settle on nets, ropes and buoys, owing to the specific problems they cause and their economic cost to the aquaculture industry. Although sessile fouling communities are well-studied from the point of view of controlling this community on aquaculture facilities, little is known about the epifaunal mobile species inhabiting these artificial structures. This thesis addresses the study of crustacean amphipods, which have been scarcely studied regarding their species composition and relation to the habitats created by the sessile species and despite being detected in high abundances. After the general introduction, which sets the study framework, Chapter 1 is a preliminary study on the composition of fouling assemblages on aquaculture facilities in the Mediterranean Sea, comparing them with others such as those in harbours or offshore structures. Therein, it is shown that fouling communities are made up of mainly bivalves, algae, hydroids and bryozoans and amphipods usually represent more than 80 % of motile fauna associated with these organisms. Moreover, amphipod assemblages are characterised by seven frequent and dominant species: Elasmopus rapax, Jassa marmorata, Jassa slatteryi, Ericthonius punctatus, Stenothoe tergestina, Caprella equilibra and Caprella dilatata. A quantitative study of amphipod densities is carried out in Chapter 2, where mean amphipod densities observed in fish farm fouling amounted to 176,000 ind.m-2 and reached maxima up to 1,000,000 ind.m-2. There, the role of the macro- and microhabitat in supporting such amphipod communities is explored. The effect of the modification of marine currents on pelagic communities due to the introduction of coastal infrastructures is analysed in Chapter 3. Therein, it was detected a retention effect on planktonic amphipods near such facilities, noticeable in the increased abundance of hyperiids and migrating amphipods from different benthic and floating habitats. The influence of fouling amphipods on other habitats is analysed in Chapters 4 and 5, it is shown that fish-farm fouling acts as a source population of amphipods dispersing towards both defaunated sediments in soft-bottoms and surrounding floating habitats. Finally, in the last chapter, based on the possibility of using wild fauna already growing in fish farms, the applicability of amphipods as an accessory culture is tested in an offshore integrated multi-trophic aquaculture (IMTA) system with finfish as main fed species. Throughout this thesis it has been shown that fish-farming activities affect the amphipod assemblage in several ways such as the establishment of high population densities or the intimate connectivity between different subpopulations. As a result, a new potential commercial application arises from the possibility of using them as biofilters of aquaculture wastes, within an off-coast integrated multitrophic aquaculture system, promoting a more sustainable development of aquaculture in the marine environment.Las estructuras artificiales que conforman las instalaciones de acuicultura en mar abierto suelen ser colonizadas por multitud de organismos marinos, que forman comunidades de fouling características en estas estructuras. Muchos estudios se han centrado en la descripción de los organismos sésiles que se desarrollan sobre cabos, redes y boyas de las instalaciones de acuicultura, debido a los problemas que generan para el cultivo y los costes adicionales que significan para la industria derivados de su necesaria eliminación. Sin embargo, aunque las comunidades de fouling sésiles han sido bien estudiadas desde el punto de vista de su control en las instalaciones de acuicultura, poco se sabe sobre la epifauna que habita estas estructuras artificiales. Esta tesis se centra en el estudio de los crustáceos anfípodos, los cuales aún no han sido estudiados en cuanto a la composición de especies y a su relación con los hábitats creados por los organismos sésiles, a pesar de haber sido detectados en grandes abundancias en las instalaciones de acuicultura. Después de una introducción general, que establece el marco de estudio, el capítulo uno es un estudio preliminar sobre las comunidades de fouling de las instalaciones de acuicultura en el Mediterráneo, comparándolas con las desarrolladas en otras estructuras artificiales como puertos o plataformas petrolíferas. En este capítulo, se demuestra que las comunidades de fouling están compuestas principalmente por bivalvos, algas, hidrozoos y briozoos y que más de un 80% de la fauna asociada a estos organismos son anfípodos. Además el poblamiento se caracteriza por la presencia de siete especies de anfípodos que son frecuentes y abundantes: Elasmopus rapax, Jassa marmorata, Jassa slatteryi, Ericthonius punctatus, Stenothoe tergestina, Caprella equilibra y Caprella dilatata. Un estudio cuantitativo de las densidades de estos anfípodos se lleva a cabo en el capítulo 2, donde se encuentra que la densidad media es de 176.000 ind.m-2, con máximos de más de 1.000.000 ind.m-2. Allí se explora también el papel de los macro y microhábitats en mantener dichas poblaciones de anfípodos. El efecto de la modificación de corrientes sobre las comunidades plantónicas debida a la instalación de las piscifactorías se analiza en el capítulo 3. En él, se detectó una retención de los anfípodos planctónicos cerca de las instalaciones, evidenciada por el incremento en las abundancias de hipéridos y de anfípodos migradores desde diferentes hábitats bentónicos flotantes. La influencia de las grandes densidades de anfípodos del fouling sobre otros hábitats se estudia en los capítulos 4 y 5, donde se observó que el fouling actúa como fuente de anfípodos migradores, exportando individuos que colonizan tanto sedimentos defaunados en el fondo marino como otros hábitats flotantes cercanos. Finalmente, en el último capítulo se analiza la posibilidad de aprovechar la producción natural y la conectividad observadas a través del cultivo de anfípodos como parte de un sistema de acuicultura multitrófica integrada (AMTI) en mar abierto con peces como especie principal. A lo largo de esta tesis, se demuestra que la acuicultura influencia las poblaciones de anfípodos marinos, tanto en el establecimiento de grandes densidades de población como en la conectividad entre las diferentes subpoblaciones. Como resultado, surge una nueva aplicación comercial de la posibilidad de usar los anfípodos del fouling como biofiltros, reciclando los residuos de la acuicultura dentro de un sistema de acuicultura multitrófica, garantizando así un desarrollo más sostenible de la acuicultura en el medio marino.
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Circuncisão, Ana Rita Sousa. "Análise do perfil nutricional de Ulva rigida cultivada sob diferentes condições em sistema de aquacultura integrada multi-trófica." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22891.
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Mestrado em Bioquímica - Bioquímica AlimentarRecentemente, tem surgido um elevado interesse na utilização comercial das macroalgas, sobretudo no setor alimentar, devido aos seus constituintes que na maioria exibem múltiplas bioatividades benéficas para a saúde. A Ulva rigida é uma macroalga verde, cosmopolita, capaz de se adaptar a uma vasta gama de condições ambientais, tornando a sua reprodução possível ao longo de todo o ano. Desta forma, torna-se uma espécie promissora de ser integrada num sistema de IMTA (aquacultura integrada multi-trófica) onde geralmente ocorre a manipulação de condições de cultivo com vista à alteração do valor nutricional das macroalgas. Neste contexto, o objetivo deste trabalho consistiu na avaliação de diferentes parâmetros nutricionais na Ulva rigida cultivada sob diferentes condições em dois desenhos experimentais diferentes, em sistema de IMTA. Para o primeiro desenho experimental, foram estabelecidas diferentes Densidades de Cultivo (DC) e Taxas de Renovação do meio de cultivo (TR) avaliadas em dois períodos sazonais diferentes. Os resultados permitiram concluir que a DC influenciou positivamente o teor de cinzas entre as diferentes condições atingindo na condição com menor DC e TR cerca de 38 % bs (base seca) em setembro. Analogamente, o teor de proteína foi influenciado pela TR, verificando um aumento do teor de médio deste parâmetro de setembro para janeiro (atingindo os 23,5 % bs) devido à maior disponibilidade de nutrientes no meio de cultivo induzido pela maior TR e pela sazonalidade. Para o segundo desenho experimental, foram estabelecidas diferentes DC e utilizados dois tipos de água de cultivo (nova e velha) de modo a avaliar, principalmente, o perfil de hidratos de carbono da Ulva rigida ao longo de três semanas. Os resultados evidenciaram que as condições de cultivo não influenciaram o teor de humidade, resíduo sólido e cinzas, no entanto foi registado uma diminuição do teor de proteína (de 18 para 7% bs), para as diferentes condições, ao longo do tempo. Em contrapartida, a análise de açúcares realizada ao Resíduo Insolúvel em Álcool (AIR) evidenciou que a Ulva rigida é constituída por Rha (7-8 % m/m), Xyl (2-3 % m/m) e UA (ácidos urónicos) (18-23% m/m), associados à presença de ulvanas, que se mantêm, praticamente inalterados entre as diferentes condições, ao longo do tempo. Contudo, foi verificado um aumento do teor de Glc (10-27 % m/m), da razão Glc/Rha e do teor total polissacarídeos do AIR, entre as diferentes condições de cultivo, ao longo do tempo, associado possivelmente à presença de amido. Adicionalmente, foram estudadas as ligações glicosídicas presentes num extrato de ulvanas, com vista à identificação da posição dos grupos sulfato tendo-se verificado, por dessulfatação, o aumento da ligação 4-Xyl e da 3,4-Rha, possivelmente indicativas da di-substituição por sulfatos no C-2 e C-3 da Xyl e Rha, estando esta última especialmente sulfatada no C-2. Assim, este trabalho permitiu concluir que a manipulação de diferentes condições de cultivo num sistema de IMTA pode induzir alterações especificas na composição físico-química da Ulva rigida, melhorando o seu valor nutricional e rentabilidade no mercado.
Recently, there has been an increasing interest in the commercial use of seaweeds, mainly in the food industry, due to their chemical compounds, which can exhibit multiple bioative health effects. The Ulva rigida is a green macroalgae, cosmopolitan, and its tolerance to a high range of environmental conditons making reproduction possible throughout the year. Thus, this is a promising specie to be integrated in the IMTA (Integrated Multi-Trophic Aquaculture) system, where the modulation of growth conditions are established in order to change the nutritional value of macroalgae. In this context, the aim of this work consisted in the evaluation of different nutritional parameters in Ulva rigida, cultivated under different conditions in two different experimental designs in an IMTA system. For the first experimental design, different stocking density (SD) and nutrient flow rate (NFR) were evaluated in two different seasonal periods. By this way, it was observed that the stocking density positively influenced the ash content between the different conditions, reaching about 38 % DM (dry matter) in september under the condition with lower DC and NFR. Similarly, the protein content was influenced by nutrient flow rate observed by an increase in the mean content of this parameter from September to January (reaching about 23,5 % DM), mainly due to the higher availability of nutrients in the medium, induced by the higher nutrient flow rate and seasonality. For the second experimental design, different SD and water types were implemented in order to mainly evaluate the carbohydrate profile of Ulva rigida over three weeks. The results showed that the cultivation conditions did not influence the moisture content, solid residue and ashes, however, a decrease of the protein content (from 18 to 7 % DM) was observed over time for the different conditions. In contrast, the sugar analysis performed on the AIR showed that the Ulva rigida was composed by Rha (7-8% m/m), Xyl (2-3 % m/m) and UA (18-23% m/m), associated to the presence of ulvans, which remained practically unchanged between the different conditions over time. However, an increase in the content of Glc (10-27 % m/m), Glc/Rha ratio and total AIR Polysaccharides, among the different conditions, over time, it was associated to the presence of starch. In addition, the glycosidic linkages present in an ulvans’s extraxt were studied in order to identify the position of the sulfate groups. The increase of the 4-Xyl and 3,4-Rha linkages indicate the existence of di-substitution by sulfates at C-2 and C-3 of Xyl and Rha, the later being speacially sulfated at C-2. Thus, the manipulation of different cultivation conditions in an IMTA system induced a change in the physical-chemical composition of Ulva rigida, improving not only its nutritional value but also its profitability in the market.
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De, Prisco Joseph Anthony. "An investigation of some key physico-chemical water quality parameters of an Integrated Multi-Trophic Aquaculture (IMTA) system operating recirculation methodology in the Western Cape of South Africa." Master's thesis, Faculty of Science, 2021. http://hdl.handle.net/11427/32653.
Full textAbstract:
Over the last few decades, Integrated Multi-Trophic Aquaculture (IMTA) in South Africa has developed from early experimental designs to large scale, commercially operating farms. This was in response to uncertainty regarding food availability for stock (primarily kelp in the case of abalone farms) and a desire to recirculate water whilst reducing the environmental footprint of the abalone farms. The growing prevalence of IMTA as a commercially viable activity has brought about a need for an expansion of the knowledge pool regarding the physico-chemical processes at work in such systems. Of particular interest to researchers are mechanisms and dynamics of nutrient transfer between components of the system and how these could be manipulated to increase efficiency and reduce running cost of farms. This work was conducted to try and quantify some of the changes in some physical and chemical characteristics of the water stream on a large-scale IMTA farm cultivating seaweed of the genus Ulva (Ulva rigida) and the locally named perlemoen abalone (Haliotis midae) on the south west coast of South Africa (Viking Abalone Farm at Buffeljagsbaai, Western Cape, South Africa) (34.7550° S, 19.6154° E). Experiment one was a three-day experiment taking place in December of 2018, there was no particular reason for the choice of month, analyses of this nature are potentially useful on any given day of any given month as although the literature contains plenty of gaps, there is no single identifiable data gap sufficient to encourage the use of particular timeframes. The sampling regime involved single sample point testing of three modular clusters each operating a different rate of water recirculation (50%, 75% and 100%) with 50% recirculation being standard farm operation, 75% and 100% tested to gauge effect of increasing recirculation, 75% tested as a potential standard farm operation to reduce load on pumps and reduce volumes of water pumped in, 100% tested in case of emergency situation which requires farm to be isolated from the inbound water stream arriving from the immediate coastal water, ambient conditions were also tested for reference and comparison. Parameters tested were those which the farmers already tested periodically to gauge changes in water quality which may effect the abalone or seaweed, though slightly different methods were used for the testing of ammonia. On the farm the standard method is the Nesler photometric test (Lovibond photometer), whereas this research was conducted using a calibrated indophenol blue spectrophotometric technique (Modified Grasshoff, 1976). Results showed no statistically significant differences (Mood's Median Test, p>0.05) between the 50% and 75% recirculation cluster for temperature, pH, Total Ammonia Nitrogen (TAN) or Free Ammonia Nitrogen NH3 (FAN). At 100% recirculation, statistically significant differences (Mood's Median Test, p0.05) occurred for temperature. At 100% recirculation, TAN and FAN increased rapidly, though the commensurate rapid and considerable decrease in pH meant the FAN increase was not as high in magnitude as it would be at 4 a normal seawater pH of around 8.2. Abalone suffered no mortalities at 100% recirculation for three days and later reports from the farmers suggested no noticeable drop in growth rate that could be attributed to this test in the months following the experiment. From the regulatory perspective, the TAN levels breached WWF guideline maximum effluent concentrations for abalone aquaculture (600µM/l) only in the 100% recirculation cluster, and only then during three of the thirteen sampling runs. The TAN concentrations in 50% and 75% recirculation treatments were far below the WWF guideline maximum effluent concentration with maximum concentrations of 7.15 µM/l in 50% and 13.46 µM/l at 75%, the increase in maximum concentration was large but not egregious and resulted from a more pronounced build-up of ammonia as residence time of water in the cluster increases at 75% recirculation. Experiment two was an intensive 24-hour sampling run; the primary aim was to test the effectiveness of the seaweed biofilter in an Integrated Multi-Trophic Aquaculture (IMTA) farm culturing perlemoen abalone and a green macroalga. Parameters tested were temperature, pH, dissolved oxygen, salinity, TAN, nitrate and nitrite as these are relevant parameters for the farmer and the necessary equipment to test them was available. Samples were stored in a freezer for this experiment due to intensity of sampling regime, and spiked standards were prepared to check shifts in concentration of TAN, nitrate and nitrite that may have resulted from the freezing and thawing processes. Spike recoveries were good in the case of TAN (87%-98%) and nitrite (92%-96%), but random and widely dispersed in the case of nitrate. As such, nitrate and nitrite were removed from the analysis as nitrite values only really held value if taken in conjunction with nitrate values. Minimal and non-useful variation in salinity observations meant that salinity was also discounted from the analysis. Temperatures varied minimally between sampling points during the experiment, though they rose in all sampling points during daytime as would be expected. pH was higher in abalone inbound and Ulva effluent water compared to the abalone effluent water. Total ammonia nitrogen percentage removal across the seaweed biofilters ranged from 65%-85% with the mean and median at 73% and 71% respectively. Free ammonia nitrogen percentage removal across the seaweed biofilters ranged from 41%-80% with the mean and median removals at 63% and 66% respectively. A regression analysis demonstrates a strong positive linear relationship between TAN removal and TAN load to the seaweed biofilter (r2= 0.90). Principal component analysis revealed a strong negative correlation between FAN removal and pH, as pH increased across the seaweed biofilters, the level of FAN removal decreased. This suggests that the perceived benefit of increasing pH in seaweed biofilters during the day-time may have some negative repercussions.
Books on the topic "IMTA"
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Bughutah, 'Abd Allah. Imta' al-sami' bi-akhbar al-rihlah al-Hajjiyah al-Maghribiyah fi al-qurun al-sabi'.... 2 v. in 2. Tiṭwān: Maktabat Salmá al-Thaqāfīyah, 2018.
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Yi, Yu-wŏn. Kugyŏk Imha pʻilgi =: Imha pʻilgi. Sŏul-si: Minjok Munhwa Chʻujinhoe, 1999.
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Azarual, Fouad. Imma. Rabat: Institut royal de la culture amazighe, centre de CEAELPA, 2007.
Find full textBook chapters on the topic "IMTA"
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Chopin, Thierry. "Aquaculture Aquaculture , Integrated Multi-trophic (IMTA) aquaculture integrated multi-trophic (IMTA)." In Encyclopedia of Sustainability Science and Technology, 542–64. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0851-3_173.
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Chopin, Thierry. "Aquaculture Aquaculture , Integrated Multi-trophic (IMTA) aquaculture integrated multi-trophic (IMTA)." In Sustainable Food Production, 184–205. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5797-8_173.
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Issar, Arie S., and Amir Neori. "Progressive Development of New Marine Environments – Imta (Integrated Multi-Trophic Aquaculture) Production." In Cellular Origin, Life in Extreme Habitats and Astrobiology, 305–18. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-8569-6_17.
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Pereira, Rui, Charles Yarish, and Alan T. Critchley. "Seaweed seaweed Aquaculture seaweed aquaculture for Human Foods in Land-Based and IMTA Systems." In Encyclopedia of Sustainability Science and Technology, 9109–28. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0851-3_189.
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Pereira, Rui, Charles Yarish, and Alan T. Critchley. "Seaweed seaweed Aquaculture seaweed aquaculture for Human Foods in Land-Based and IMTA Systems." In Sustainable Food Production, 1405–24. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5797-8_189.
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Sarkar, Soumyabrata, P. Nila Rekha, G. Biswas, R. Nishan Raja, Albin Sunny, A. Panigrahi, C. P. Balasubramanian, and K. K. Vijayan. "Integrated Multi-Trophic Aquaculture (IMTA): A Potential Farming System to Enhance Production of the Red Seaweed Agarophyton tenuistipitatum (Chang and Xia) in Brackishwater." In Transforming Coastal Zone for Sustainable Food and Income Security, 537–52. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95618-9_40.
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Gagné, Françoys. "The DMGT/IMTD." In Fundamentals of Gifted Education, 55–70. Second edition. | New York, NY : Routledge, 2017.: Routledge, 2017. http://dx.doi.org/10.4324/9781315639987-6.
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Heppner, John B., D. G. Boucias, J. C. Pendland, Andrei Sourakov, Timothy Ebert, Roger Downer, Kun Yan Zhu, et al. "Imma Moths (Lepidoptera: Immidae)." In Encyclopedia of Entomology, 1921. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6359-6_1495.
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Newman, Jonathan. "Intima-Media Thickness (IMT)." In Encyclopedia of Behavioral Medicine, 1243. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-39903-0_1270.
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Boltz, Marie, Holly Rau, Paula Williams, Holly Rau, Paula Williams, Jane Upton, Jos A. Bosch, et al. "Intima-Media Thickness (IMT)." In Encyclopedia of Behavioral Medicine, 1116. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4419-1005-9_1270.
Full textConference papers on the topic "IMTA"
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Zhou, Jinxin, Takero Yoshida, Junbo Zhang, Sanggyu Park, and Daisuke Kitazawa. "Three-Dimensional Physical Environment Modelling for Integrated Multi-Trophic Aquaculture (IMTA) Implementation in Onagawa Bay, Japan." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95672.
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Abstract Continually increasing demands on aquaculture products drive the current monoculture to upgrade and upscale because of not only economic but environmental sustainability reasons. Over the past decade, open water integrated multi-trophic aquaculture (IMTA) practiced as a potential alternative has been demonstratively illustrated from both scientific and public attention. Basing on previous studies of this synergistic aquaculture system, we, here, studied the physical environment in Onagawa Bay as the cornerstone for further IMTA implementation. Onagawa Bay locates in Miyagi Prefecture, Japan, and because of its mature practice on polyculture, it is recognized as a suitable site for IMTA. Unfortunately, the earthquake and tsunami in 2011 caused a huge uncertainty on physical environment changes. Still insufficient researches have been conducted on physical environment study, especially through modelling method. Here, adopting the three-dimensional Marine Environmental Committee (MEC) ocean model, we described the setup and validation for Onagawa Bay in this research. At the present stage, simulation results can best fit observation data on the tidal elevation with the correlation coefficient between observed and simulated tidal elevation reaching 0.96, captured the main characteristic of flow velocity, and exhibited homogenous tendency towards water temperature. Furthermore, through the plot of the residual velocity field and statistical seasonal velocity distribution, potential aquaculture configuration has been discussed spatio-temporally on the hypothesis that high current speeds contribute to the further implementation.
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Wardhani, Anita, Muhammad Zikra, Bambang Semedi, and Agung Mukti. "Environmental Conditions in Karimunjawa to Support the Integrated Multi-Trophic Aquaculture (IMTA) Program." In The 7th International Seminar on Ocean and Coastal Engineering, Environmental and Natural Disaster Management. SCITEPRESS - Science and Technology Publications, 2019. http://dx.doi.org/10.5220/0010056600760082.
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Insani, Abdul Ghofur Ragil, R. O. Saut Gurning, Badruz Zaman, and Semin. "Coastal Open-Water Modelling Integrated Multi-Trophic Aquaculture (IMTA) based on Blue Economy." In The 3rd International Conference on Marine Technology. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0008549000490054.
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Tang, Guifang, Yanjun Li, Paul S. Wills, Dennis M. Hanisak, and Bing Ouyang. "Development of a macroalgal biomass sensor for an integrated multi-trophic aquaculture (IMTA) system." In Big Data III: Learning, Analytics, and Applications, edited by Fauzia Ahmad, Panos P. Markopoulos, and Bing Ouyang. SPIE, 2021. http://dx.doi.org/10.1117/12.2587927.
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Fernandes, E., M. João Rodrigues, V. Castañeda-Loaiza, F. Albericio, and L. Custódio. "Short Lecture “Asexual propagation and biochemical properties of Sarcocornia perennis ecotypes under cultivation in an integrated multitrophic aquaculture (IMTA) system”." In GA – 70th Annual Meeting 2022. Georg Thieme Verlag KG, 2022. http://dx.doi.org/10.1055/s-0042-1758952.
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Fairman, William, Paul S. Wills, Dennis Hanisak, and Bing Ouyang. "Pseudorandom encoded-light for evaluating biomass (PEEB): a robust COTS macroalgal biomass sensor for the integrated multi-trophic aquaculture (IMTA) system." In Big Data IV: Learning, Analytics, and Applications, edited by Fauzia Ahmad, Panos P. Markopoulos, and Bing Ouyang. SPIE, 2022. http://dx.doi.org/10.1117/12.2618773.
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Custódio, L., J. Marques, M. Alves, M. João Rodrigues, V. Castañeda-Loaiza, P. Pousão, and F. Soares. "Short Lecture “Effect of saline irrigation on biochemical properties of Salicornia ramosissima L. under cultivation in an integrated multitrophic aquaculture (IMTA) system”." In GA – 70th Annual Meeting 2022. Georg Thieme Verlag KG, 2022. http://dx.doi.org/10.1055/s-0042-1758953.
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Molinari, F., K. M. Meiburger, L. Saba, G. Ledda, M. Anzidei, U. R. Acharya, Guang Zeng, S. Shafique, A. Nicolaides, and J. Suri. "Carotid IMT variability (IMTV): Its design and validation in symptomatic vs. asymptomatic 142 Italian population." In 2012 34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2012. http://dx.doi.org/10.1109/embc.2012.6346513.
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Benitez, Ana B., Shih-Fu Change, and John R. Smith. "IMKA." In the ninth ACM international conference. New York, New York, USA: ACM Press, 2001. http://dx.doi.org/10.1145/500141.500267.
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Liu, Fangxin, Wenbo Zhao, Zongwu Wang, Tao Yang, and Li Jiang. "IM3A." In GLSVLSI '21: Great Lakes Symposium on VLSI 2021. New York, NY, USA: ACM, 2021. http://dx.doi.org/10.1145/3453688.3461491.
Full textReports on the topic "IMTA"
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Briffa, Norman. IMA Harvesting. Touch Surgery Simulations, February 2015. http://dx.doi.org/10.18556/touchsurgery/2015.s0039.
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Biswal, S., and G. Erbert. Testing of the IMRA Wattlite Laser. Office of Scientific and Technical Information (OSTI), June 2000. http://dx.doi.org/10.2172/15013505.
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Arapoglou, Stergios. Dispute in the Aegean Sea the Imia/Kardak Crisis. Fort Belvoir, VA: Defense Technical Information Center, April 2002. http://dx.doi.org/10.21236/ada420639.
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Takahashi, Kazunari, Masaaki Kaizuka, and Akira Kabasawa. Development of IMA System for V6 Powertrain. Warrendale, PA: SAE International, May 2005. http://dx.doi.org/10.4271/2005-08-0396.
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Sriraj, P. S., Bo Zou, Lise Dirks, Nahid Parvez Farazi, Elliott Lewis, and Jean Paul Manzanarez. Maritime Freight Data Collection Systems and Database to Support Performance Measures and Market Analyses. Illinois Center for Transportation, December 2020. http://dx.doi.org/10.36501/0197-9191/20-021.
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The Illinois Marine Transportation System (IMTS) is a key component of the nation’s inland waterway system. IMTS is comprised of 27 locks and dams, 19 port districts, more than 350 active terminals, and 1,118 miles of navigable inland waterways traversing along the borderline or within the state of Illinois. However, the infrastructure of IMTS is aging and its conditions are deteriorating. To monitor the performance of IMTS and guide infrastructure investment to enhance safety, efficiency, and reliability of the system, a comprehensive performance measurement program is needed. To this end, the objective of this project is to create an integrated, comprehensive, and maintainable database that facilitates performance measurement of maritime freight to, from, and through Illinois. To achieve this objective, a review of the literature on maritime freight transportation both in the United States and abroad was performed. To gauge practitioners’ points of view, a series of phone interviews and online surveys of Illinois’ neighboring state DOT officials, officials from the US Army Corps of Engineers, Illinois port district authorities, and carriers operating in Illinois was also conducted. With the findings from the literature review and an understanding of state DOT practices, the needed and available data sources for a maritime freight performance measurement program were identified. Building on all the above efforts, a first-of-its-kind PM database for IMTS was designed and developed, along with a detailed user manual, ready for IDOT’s immediate use and future updates. In addition, opportunities for IDOT to use the database to conduct analysis are discussed. Key programmatic recommendations that outline the role of IDOT as a champion and as a facilitator are further included. The outcome of this project will help IDOT gain much-needed knowledge of and develop programs to improve IMTS performance, increase multimodal transportation network capacity, and expand the transportation and logistics sector of the state, which ultimately benefit the people and economy of Illinois.
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Carbaugh, Eugene H., and Donald E. Bihl. Items Supporting the Hanford Internal Dosimetry Program Implementation of the IMBA Computer Code. Office of Scientific and Technical Information (OSTI), January 2008. http://dx.doi.org/10.2172/967011.
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Baldwin, C. A., and M. J. Kania. IMGA [Irradiated Microsphere Gamma Analyzer] examination of the Set No. 4 fuel under project work statement FD-20. Office of Scientific and Technical Information (OSTI), March 1990. http://dx.doi.org/10.2172/455552.
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Huang, Hui-Min, John Michaloski, Daniel Campbell, Robert Stone, Thomas Kramer, Curtis Brown, Robert Brown, and Gavrail Tatarliev. End-to-end Demonstration of the Quality Information Framework (QIF) Standard at the International Manufacturing Technology Show (IMTS) 2014. National Institute of Standards and Technology, March 2016. http://dx.doi.org/10.6028/nist.ir.8102.
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Gibbons, Jennifer A., Trevor Glaros, Steve Harvey, Calvin Chue, and Paul Demond. Evaluation of a Recombinant Escherichia coli Strain that Uses the Sarin Simulant Isopropylmethylphosphonic Acid (IMPA) as a Sole Carbon and Phosphate Source. Fort Belvoir, VA: Defense Technical Information Center, April 2016. http://dx.doi.org/10.21236/ad1008441.
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Hunn, John, Robert Morris, Charles Baldwin, Fred Montgomery, Chinthaka Silva, and Tyler Gerczak. AGR-1 Irradiated Compact 6-1-1 PIE Report: Evaluation of As-Irradiated Fuel Performance Using Leach Burn Leach, IMGA, Materialography, and X-ray Tomography. Office of Scientific and Technical Information (OSTI), June 2012. http://dx.doi.org/10.2172/1649082.
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