Academic literature on the topic 'Aquafeeds'
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Journal articles on the topic "Aquafeeds"
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Bourne, Nicholas, David Blyth, and Cedric Simon. "Rapid prediction of chemical composition and degree of starch cook of multi-species aquafeeds by near infrared spectroscopy." Journal of Near Infrared Spectroscopy 29, no. 4 (April 28, 2021): 216–25. http://dx.doi.org/10.1177/0967033521999116.
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Ensuring aquafeeds meet the expected nutritional and physical specifications for a species is paramount in research and for the industry. This study aimed to examine the feasibility of predicting the proximate composition and starch gelatinisation (or cook) of aquaculture feeds (aquafeeds) regardless of their intended target species by near infrared (NIR) spectroscopy. Aquafeed samples used for nutrition experiments on various aquatic species with different nutritional requirements, as well as aquafeeds manufactured under varying extrusion conditions and steaming time to generate variable starch cook were used in this study. The various size pellets were ground before scanning by NIR spectroscopy, then models were developed to estimate dry matter, ash, total lipid, crude protein, and gross energy as well as starch cook. Proximate prediction models were successfully produced for diets with R2 values between 0.88 and 0.97 (standard error of cross-validation (SECV) 0.43 to 1.46, residual predictive deviation (RPD) 4.6 to 15.6), while starch cook models were produced with R2 values between 0.91 and 0.97 (SECV 3.60 to 5.76, RPD 1.2 to 1.9). The developed NIR models allow rapid monitoring of the nutritional composition, as well as starch cook, one of the major physical properties of aquafeeds. Models that provide rapid quality control assessment of diet characteristics is highly desirable in aquaculture research and the aquafeed industry.
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Soares, TM, DA Coutinho, LD Lacerda, MO Moraes, and MF Rebelo. "Mercury accumulation and metallothionein expression from aquafeeds by Litopenaeus vannamei Boone, 1931 under intensive aquaculture conditions." Brazilian Journal of Biology 71, no. 1 (February 2011): 131–37. http://dx.doi.org/10.1590/s1519-69842011000100019.
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This study describes the accumulation of Hg and metallothionein gene expression in Litopenaeus vannamei Boone, 1931 with aquafeeds as the major source of Hg. Trials were conducted under controlled conditions in experimental tank facilities with high (indoor tanks) and low (outdoor tanks) Hg aquafeeds concentrations. Aquafeeds were the sole source of Hg for the shrimps and concentrations varied from 5.4 to 124 ng.g-1 d.w.. In the three animal fractions analysed; muscle (6,3 - 15,9 ng.g-1); hepatopancreas (5,1 - 22,0 ng.g-1) and exoskeleton (3,0 - 16,2 ng.g-1), Hg concentrations were significantly lower in the outdoor trials submitted to Hg-poor aquafeeds. Maximum shrimp muscle Hg concentrations were low (36.4 ng.g-1 w.w.) relative to maximum permissible concentrations for human consumption and Hg content in muscle and hepatopancreas were significantly correlated with Hg content in aquafeeds. Highest Hg concentrations in the exoskeleton of animals exposed to Hg-richer aquafeed, suggested that a detoxification mechanism is taking place. On the other hand the metallothionein suffered no variation in its relative expression in any of the experiments, meaning that the contact with feed containing the observed Hg concentrations were not sufficient to activate gene transcription. It was not possible, under the experimental design used, to infer Hg effects on the biological performance of the animals.
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Wilson, Robert P. "Farm-made aquafeeds." Aquaculture 130, no. 1 (February 1995): 93–94. http://dx.doi.org/10.1016/0044-8486(95)90096-9.
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Tschirner, Martin, and Werner Kloas. "Increasing the Sustainability of Aquaculture Systems: Insects as Alternative Protein Source for Fish Diets." GAIA - Ecological Perspectives for Science and Society 26, no. 4 (January 1, 2017): 332–40. http://dx.doi.org/10.14512/gaia.26.4.10.
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While aquaculture has a huge potential to contribute to the food security of our planet in the upcoming decades, it is still associated with various environmental concerns. The use of insects as a sustainable protein component in aquafeeds might change that.The fast growth of the aquaculture sector worldwide increases the demand for aquafeeds. Since the production of conventional protein sources like fish meal is stagnating due to fully exploited fish stocks, far-reaching sustainable adaptions of production techniques as well as new alternative protein sources have to be identified. A first step could be the production of omnivorous freshwater species with more modest feed requirements instead of carnivorous marine species. A next step could be the substitution of marine aquafeed ingredients. The popular practice to substitute fish meal by plant proteins is, however, problematic from a nutritive physiological point of view. Moreover, feed crop production, for example, soybeans, has negative effects on land use and water consumption. Novel protein sources of animal origin are insect meals that combine a high nutritional value with small environmental impact production systems.
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Rumbos, Christos I., Eleni Mente, Ioannis T. Karapanagiotidis, Georgios Vlontzos, and Christos G. Athanassiou. "Insect-Based Feed Ingredients for Aquaculture: A Case Study for Their Acceptance in Greece." Insects 12, no. 7 (June 28, 2021): 586. http://dx.doi.org/10.3390/insects12070586.
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Although the inclusion of insects in fish diets is officially allowed in the EU since 2017, insect-based aquafeeds have not been widely adopted by the European aquaculture sector. In order to investigate the perceptions related with adoption trends, it is critical to explore the beliefs of people associated with the aquaculture sector on the use of insects in farmed fish diets. A survey was conducted among 228 participants of an aquaculture conference to explore their perceptions on the inclusion of insect meal in fish diets. Additionally, we investigated the attitudes of nine companies operating in the aquaculture and aquafeed sector in Greece that attended the conference towards this direction. The findings of the conference survey provide evidence that there is a wide-range awareness and acceptance regarding the use of insect-based feeds in farmed fish diets among the respondents. This is mainly driven by the expectations for the decline in fishing pressure on wild fish stocks, the reduction of the ecological footprint and the enhancement of the sustainability of the aquaculture sector. The results of the stakeholder survey show that six out of the nine companies that participated in the survey are favorably disposed towards the use of insect-based feeds. Specifically, four of them stated that they would produce or use aquafeeds based on insects. However, the results highlight the need for further research on the implementation of the wider adoption of insect-based feeds in aquaculture. The present study provides some first insights into the use of insect-based aquafeeds in Greece, for which there are no data available.
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Munguti, Jonathan M., James G. Kirimi, Kevin O. Obiero, Erick O. Ogello, Domitila N. Kyule, David M. Liti, and Levi M. Musalia. "Aqua-Feed Wastes: Impact on Natural Systems and Practical Mitigations—A Review." Journal of Agricultural Science 13, no. 1 (December 15, 2020): 111. http://dx.doi.org/10.5539/jas.v13n1p111.
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Dietary composition of aquaculture feeds (aquafeeds) determines the quality of wastes from aquaculture production systems. These wastes, which are derived mainly from nitrogenous and phosphorus compounds subsequently affect water quality in the culture systems and the ambient environment. Depending on the type of culture systems and management practices employed, the aquafeed wastes can influence the water pH, algal turbidity, biological oxygen demand (BOD) and may cause fish mortality. The aquafeed wastes also can facilitate eutrophication leading into harmful algal blooms. Moreover, large quantities of aqua-waste are discharged as fish cannot retain all the food they consume which means a significant portion of the feed remains uneaten. In this paper, we review and discuss practical nutritional strategies and mitigation measures to reduce aquafeed wastes including controlled formulation using high-quality ingredients, enzyme-based aquafeed, processing, reduction of anti-nutrition factors and precision feeding. The paper further recommends strategies for enhancing the resilience of aquaculture production systems and mitigation measures to reduce the effects of aqua-wastes on ambient natural environments.
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Goddard, Stephen, and Fahad Saleh Ibrahim. "Protein resources and aquafeed development in the Sultanate of Oman." Journal of Agricultural and Marine Sciences [JAMS] 20 (January 1, 2015): 47. http://dx.doi.org/10.24200/jams.vol20iss0pp47-53.
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The continued growth of intensive aquaculture is dependent on the development of sustainable protein sources to replace conventional fish meals in aquafeeds. Practical alternatives are plant-derived protein, protein from micro-organisms and protein from under-utilized marine resources. The challenges are to find alternative ingredients with high protein, suitable amino acid content, high palatability and absence of anti-nutritional factors. There is considerable biotechnology-based research in this area, including genetic modification of plant-based proteins, use of probiotics to enhance digestibility and the renewed application of fermentation technologies to produce single cell proteins. Research in Oman is focused on the utilization of marine protein resources. Fisheries by-catch and processing waste have been evaluated as liquid hydrolysates and as meals for inclusion in aquafeeds and new research is planned on the utilization of meso-pelagic fish (myctophids), which occur in abundance in the Arabian Sea and the Sea of Oman. Initial studies have been conducted on the biochemical composition of the lantern fish, Benthosema pterotum, which revealed favorable protein, amino acid and long-chain PUFA content. Potential limiting factors were high levels of saturated lipids and the heavy metals arsenic and cadmium. These results will be discussed within a general review of marine resources and aquafeed development in Oman.
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Liland, N. S., P. Araujo, X. X. Xu, E. J. Lock, G. Radhakrishnan, A. J. P. Prabhu, and I. Belghit. "A meta-analysis on the nutritional value of insects in aquafeeds." Journal of Insects as Food and Feed 7, no. 5 (August 13, 2021): 743–59. http://dx.doi.org/10.3920/jiff2020.0147.
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A major challenge for development of sustainable aquafeeds is its dependence on fish meal and fish oil. Similarly, it is unwanted to include more plant ingredients which adds more pressure on resources like arable land, freshwater and fertilisers. New ingredients that do not require these resources but rather refine and valorise organic side streams, like insects, are being developed. Increasing evidence indicates that using insect ingredients in aquafeeds are a sustainable alternative and considerable progress has been made on this topic in the past years. The aim of this chapter is to present a comprehensive and systematic analysis of the data available on the impact of insects in aquafeeds. Systematic search, collection and selection of relevant literature from databases such as Web of Science and NCBI was performed. The literature search enabled 91 scientific papers from peer-reviewed journals, comprising a dataset of 415 experimental diets, including 35 different aquatic species and 14 insect species to be included in this meta-analysis, covering what we consider a close to complete representation of credible publications on this topic. Information on aquatic species, insect species, dietary composition (amino acids, fatty acids, proximate composition) and performance outputs (growth performance indicators and nutrient digestibility) were included in the construction of the dataset. Regression models and principal component analyses were performed on the meta-data. The results from the meta-analysis revealed a great degree of variation in the maximum threshold for insect inclusion in aquafeeds (from 4 to 37%) based on subgroups of trophic level of aquatic species, insect species used, statistical method and the output parameter. Overall, a maximum threshold of 25-30% inclusion of insects in aquafeeds for uncompromised performance is suggested. Reduction in protein digestibility, imbalanced amino acid profile and increasing levels of saturated fatty acid were identified as major factors limiting higher inclusion of insects in aquafeeds.
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Lecrenier, Marie-Caroline, Aline Marien, Gilbert Berben, Olivier Fumière, Pascal Veys, and Vincent Baeten. "Survey of animal by-products in feedingstuffs before the reintroduction of processed animal proteins in aquafeed." BASE, no. 4 (2019): 218–25. http://dx.doi.org/10.25518/1780-4507.18219.
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Description. Since 2001, the number of bovine spongiform encephalopathy cases has drastically declined. A gradual lifting of the feed ban for aquaculture was possible in 2013 but this partial relaxation makes its control much more complex. Objectives. The objective was to have a practical overview of the current analytical situation and to highlight current and foreseen analytical gaps in the context of a progressive lifting of the ban. Method. Feed samples, collected before the partial lifting as regards aquafeed in 2013, were firstly analyzed by light microscopy. All samples were additionally analyzed by PCR in order to study the difficulties which would be faced with feeds produced after the relaxation. ELISA for the detection of milk proteins was also performed on samples in which ruminant DNA was detected. Results. When keeping the interpretation to the sole light microscopy results, all samples were in accordance to the legal requirements. Adding the PCR results made the interpretation more difficult. DNA of terrestrial animals was detected in nearly 65% of the samples. Apart from aquafeeds, the presence of ruminant DNA could be explained by the use of dairy products confirmed in most cases by ELISA. In aquafeeds, 23% (13/57) of the samples tested positive for ruminant DNA but only three of them also tested positive for milk proteins. Conclusions. The study underlined the crucial need for complementary analytical solutions in order to identify the source of the detected DNA.
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Tacon, Albert G. J., and Ian P. Forster. "Aquafeeds and the environment: policy implications." Aquaculture 226, no. 1-4 (October 2003): 181–89. http://dx.doi.org/10.1016/s0044-8486(03)00476-9.
Full textDissertations / Theses on the topic "Aquafeeds"
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Farzad, Razieh. "Novel Aquafeed Towards A Sustainable Aquaculture." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/103810.
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With World Health Organization estimation of population increase to over 9 billion by 2050, malnutrition and food insecurity are predicated to be two of the main challenges facing the world in the future. Fish is a source of protein that can have a significant contribution for solving the global food crisis. Fish for human consumption is provided by both the aquaculture industry and the capture fisheries, however, the flat-lined production of seafood from capture fisheries means aquaculture production should double in number to provide enough protein by 2050. Culturing fish at higher densities is being used as a way to increase the global aquaculture production. Modern aquaculture intensified practices expose the fish to various stressors that can negatively impact their welfare. Good nutrition can improve the health status of aquacultured fish while accumulation of specific nutrient can add value to the fillet. In line with that, the studies described in this dissertation aimed to examine the vital role of fish in human health and evaluate strategies to improve the sustainable aquaculture production of fish using novel aquafeeds. This was completed by conducting a survey of the essential minerals and heavy metals of commercially available catfish, salmon, and tilapia fillets in the United States marketplace and three fish nutritional trials to evaluate the impacts of novel aquafeeds on production and health of fish and the food quality of their respective fillets. Selenium with the established health benefit for human and fish was the trace mineral of interest in this dissertation. This element is the main component of a group of selenium containing proteins called selenoproteins that are antioxidant and maintain oxidative homeostasis of fish and human. Additionally, selenium is an antagonist for many heavy
metals such as mercury. The market study revealed that catfish, salmon and tilapia samples available in United States marketplace are good source of selenium, zinc and phosphorous. The concentration of heavy metals in all the samples were lower than safety standards. Nile tilapia (Oreochromis niloticus) and rainbow trout (Oncorhynchus mykiss), which are two economically important aquacultured fish, were used as animal models in the fish nutritional trials. Different forms of selenium supplemented to Nile tilapia diet. The form of Dietary Se form did not have any significant (p>0.05) effect on growth, and plasma and hepatic GPX activity of Nile tilapia. However, organic selenium supplement showed significantly (p<0.05) higher bioavailability and accumulated in the fillets at the significantly higher concentration. In the second fish trial selenoneine, a novel selenium containing compound, was supplemented at various concentrations to rainbow trout diet. Other than growth parameters multiple other health biomarkers (lysozyme, glutathione peroxidase, superoxide dismutase activities) were examined to determine whether selenoneine supplementation had a positive impact on fish health. Selenoneine enriched diet significantly(p<0.05) increased the weight gain, lysozyme and oxidative enzymes activities of rainbow trout. Lastly rainbow trout feed was supplemented with commercially available probiotic (Actisaf), prebiotic (Safmmann), and their mixture (synbiotic). These dietary supplements did not have any significant effect on fish production but led to a significant increase in activity of oxidative enzymes in plasma when compared to control diet. These results suggest that feed supplements used in this dissertation can be used to promote the fish health raised in recirculating aquaculture systems and support an economically and environmentally sustainable aquaculture.PHD
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Jobbins, Marcel Adriano. "COEFICIENTES DE DIGESTIBILIDADE APARENTE DE FARINHAS DE FEIJÃO COMUM (Phaseolus vulgaris L.) IN NATURA E EXTRUSADA PARA TILÁPIA DO NILO (Oreochromis niloticus), DETERMINADOS POR DOIS MARCADORES." Universidade Estadual de Ponta Grossa, 2018. http://tede2.uepg.br/jspui/handle/prefix/2714.
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Este estudo foi desenvolvido para determinar os coeficientes de digestibilidade aparente (CDA) de matéria seca (MS), energia bruta (EB), proteína bruta (PB), amido, lipídios, fibra bruta (FB), cinzas (CZ) e de aminoácidos (AA) essenciais e não essenciais de farinha de feijão in natura (FI) e feijão extrusada (FE) para juvenis de tilápia do Nilo utilizando dois marcadores de digestibilidade: óxido crômio (Cr2O3) ou cinza insolúvel em ácido (CIA). Foi elaborada uma dieta referência peletizada (DR) contendo 35,19% de PB e 17,78 MJ/ kg de EB. As dietas testes constituíam-se de 70% da DR e 30% de FI ou FE. Grupos de 15 individuos (150,16 ± 20,32 g) foram distribuídos em seis aquários de digestibilidade de 200 L, em um esquema fatorial 2 x 2, onde foram avaliados dois métodos de processamento (FI ou FE) e dois marcadores (Cr2O3 ou CIA), com duas repetições, compondo o “pool” de fezes de cada dieta testada. Os maiores CDA, referentes a interação (processamento x marcador), foram encontrados para MS, EB, PB, CZ e AA essenciais como: arginina (Arg), histidina (His), isoleucina (Ile), leucina (Leu), lisina (Lys), metionina (Met),fenilalanina (Phe), treonina (Thr) e nos AA não essenciais: ácido aspártico (Asp), cisteína (Cys), ácido glutâmico (Glu), glicina (Gly), serina (Ser) e tirosina (Tyr). O CDA de amido e para os AA essencias triptofano (Trp) e valina (Val) foi maior no FE em comparação ao FI, deferenciando dos lipídios que apresentaram melhores resultados para FI. Para FB e o AA não essencial alanina (Ala), por sua vez, não houve influência dos tratamentos dietéticos e marcadores. Independentemente do processamento a Met, His e Arg foram os AA limitantes para dietas contendo farinhas de feijão. Em conclusão, a FE apresentou -se como sendo boa fonte de energia e nutrientes, porém, os teores de Met e Cys devem ser considerados para as necessidades dietéticas de AA contendo enxofre e o marcador CIA não se mostrou sendo confiável para tilápia do Nilo.
The trial aimed to evaluate the apparent strain digestibility coefficients (ADC) of dry matter (DM), gross energy (GE), crude protein (CP), starch, lipids, crude fiber (CF), ashes (AS) and essential and non-essential amino acids (AA) of in natura bean flour (FI) and extruded bean flour (FE) for juvenile Nile tilapia using two digestibility markers: chromium oxide (Cr2O3) or acid insoluble ash (AIA). It was elaborated a pelleted reference diet (RD) containing 35.19% CP and 17.78 MJ / kg GE, the test diets consisted of 70% RD and 30% of FI or FE. Groups of 15 individuals (150.16 ± 20.32 g) were distributed in six digestibility aquariums of 200 L, in a 2 x 2 factorial scheme, two processing methods (FI or FE) and two markers (Cr2O3 or AIA) were evaluated, with two replicates, composing the faeces pool of each diet tested. The highest ADC referring to the interaction (processing x marker) were found for DM, GE, CP, As and essential AA as: arginine (Arg), histidine (His), isoleucine (Ile), leucine (Leu), lysine (Lys), methionine (Met), phenylalanine (Phe), threonine (Thr) and for non-essential AAs: aspartic acid (Asp), cysteine (Cys), glutamic acid (Glu), glycine (Gly), serine (Ser) and tyrosine (Tyr). The CDA of the starch and the essential AA tryptophan (Trp) and valine (Val) was higher in FE compared to FI, different from lipids, which presented better results for FI. For GE and nonessential amino acid alanine (Ala) there was no influence of dietary treatments and markers. Regardless of the processing, Met, His and Arg were the limiting AAs for diets containing bean flours. In conclusion, FE proved to be a good source of energy and nutrients, however, the low levels of Met and Cys should be considered for the dietary requirements of AA containing sulfur. The AIA marker proved to be unreliable for Nile tilapia.
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Karalazos, Vasileios. "Sustainable alternatives to fish meal and fish oil in fish nutrition : effects on growth, tissue fatty acid composition and lipid metabolism." Thesis, University of Stirling, 2007. http://hdl.handle.net/1893/220.
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Traditionally, fish meal (FM) and fish oil (FO) have been used extensively in aquafeeds, mainly due to their excellent nutritional properties. However, various reasons dictate the use of sustainable alternatives and the reduction of the dependence on these commodities in fish feeds. Hence, the aim of the present thesis was to investigate the effects of the replacement of FM and FO with two vegetable oils (VO) and an oilseed meal on the growth performance, feed utilization, nutrient and fatty acids (FA) digestibility and tissue FA composition and metabolism in three commercially important European fish species. Specifically, in Experiment I crude palm oil (PO) was used to replace FO in diets for rainbow trout. In Experiments II and III FO was replaced with rapeseed oil (RO) in diets for Atlantic salmon at various dietary protein/lipid levels aiming also at further reductions of FM by using low protein (high lipid) diet formulations. In Experiments II and III the fish were reared at low and high water temperatures, respectively, in order to elucidate, also, the potential effects of temperature. Lastly, the effects of the replacement of FM with full fat soya meal (FFS) in Atlantic cod were investigated in Experiment IV. The results of the present thesis showed no negative effects on growth performance and feed utilization in rainbow trout when FO was replaced with PO. The dietary inclusion of RO improved the growth of Atlantic salmon, possibly, due to changes in the nutrient and FA digestibilities and FA catabolism while, the growth and feed utilization were unaffected by the dietary protein/lipid level. However, the growth of Atlantic cod was affected negatively by the replacement of FM with FFS. The proximate composition of the fish whole body was in most cases unaffected by dietary treatments. The changes in dietary formulations affected the dietary FA compositions and resulted in significant changes in the fish tissue FA compositions. It was clearly shown that the fish tissue total lipid FA composition reflects the FA composition of the diet, although specific FA were selectively utilized or retained in the tissues by the fish. These may have serious implications not only for fish metabolism and growth but also for the quality of the final product, especially in terms of possible reductions of n-3 HUFA.
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Medina, Miles D. "Effect of Aquafeed on Productivity of Red Amaranth and on Water Quality under Aquaponic Cultivation." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1206.
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Aquaponics, the integrated production of fish and hydroponic crops in a recirculating system, is an intensive cultivation method in which metabolic fish wastes fertilize plants. This study compares the effects of two aquafeeds on Red amaranth (Amaranthus tricolor) productivity and on water quality under cultivation of Blue tilapia (Oreochromis aureus), with three aquaponic units (n=3) per treatment over a 60-day trial. The fishmeal-based control feed contains higher crude protein (40%) and phosphorus (1.12%) than the plant-based alternative feed (32% and 0.40%). The alternative feed resulted in a significantly higher amaranth crop yield (p
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Kumar, Vikas [Verfasser], and Klaus [Akademischer Betreuer] Becker. "Jatropha meal and protein isolate as a protein source in aquafeed / Vikas Kumar. Betreuer: Klaus Becker." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2011. http://d-nb.info/1027291988/34.
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Guadagnini, Davide. "Impiego delle microalghe per migliorare la sostenibilità dell’allevamento di orate e branzini." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
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L'allevamento di orate e spigole è una delle più importanti forme di acquacoltura nel Mar Mediterraneo. Grazie allo sviluppo della grande distribuzione organizzata, il consumo ittico negli ultimi anni è cresciuto molto, anche per la percezione positiva da parte del consumatore riguardo la salubrità di questi prodotti; infatti, le specie studiate risultano avere un buon contenuto proteico e un basso tenore lipidico, apportando però discrete quantità di PUFA n-3. È stato dimostrato che la produzione sia di spigole che di orate può comportare tuttavia un impatto ambientale nelle zone di allevamento ed in particolare eutrofizzazione e inquinamento delle acque; infatti questi pesci sono carnivori e necessitano di mangimi con elevato tenore di proteine animali. La produzione di mangimi per le specie ittiche carnivore prevede l’inclusione di oli e farine proteiche di pesce, e rappresenta quindi l’aspetto maggiormente critico in termini di impatto ambientale. In questo elaborato vengono proposte le microalghe come alimento alternativo ai mangimi convenzionali, analizzando le loro proprietà nutrizionali e di tecniche di riproduzione. Risulta che questi organismi conferiscono buone quantità di proteine, di acidi grassi n-3 PUFA, in particolare di EPA e DHA, e si riproducono agevolmente in vari habitat. Nonostante ciò, il prezzo elevato limita il loro impiego in queste produzioni e sono quindi necessari sviluppi in ambito tecnologico per abbassare i costi.
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Ginindza, Nhlanhla Joseph. "Effect of lipid inclusion levels in aquafeed on carcass composition, quality change during storage and nutrient excretion in dusky kob (Argyrosomus japonicus)." Thesis, Rhodes University, 2016. http://hdl.handle.net/10962/d1020854.
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Dusky kob, Argyrosomus japonicus, is an aquaculture species in South Africa that is in pilot commercial production. While the major nutrient requirements of the species are known, the advantages of incorporating formulated feeds into the diet of the species has yet to be fully explored. Research on formulated feed composition is required to: minimise input costs; improve the organoleptic properties and meat quality; and minimise nutrient loss, which contributes to environmental pollution. This study sought to test the impact of different lipid levels in aquafeeds fed to dusky kob juveniles by determining: (i) growth performance, feeding efficiency, proximate and fatty acid composition; (ii) chemical changes and shelf-life of refrigerated fish fillets; and (iii) metabolic rates and nitrogen excretion of juvenile dusky kob. And more...
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Bowyer, Peter Hervé A. "Assessment of a solid-state fermentation product in contemporary and lupin-containing diets for commercial finfish." Thesis, University of Plymouth, 2016. http://hdl.handle.net/10026.1/6555.
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This body of research explores the dietary application of a bioactive, solid-state fermentation (SSF) product in contemporary and lupin-containing diets of Nile tilapia (Oreochromis niltoticus) and rainbow trout (Oncorhynchus mykiss). Consequently, the work provides holistic assessment of the influences of SSF products on animal health and performance; depending upon rearing temperature, nutritional physiologies, feed formulations and extrusion conditions; alongside information on the performance of lupins in aquafeeds. The SSF product (at 0.1 % inclusion) improved growth performance of Nile tilapia fed diets containing lupins. Phosphorous retention appeared higher when the SSF product was included in a yellow lupin (Lupinus luteus) diet whilst Mg retention was significantly higher in fish fed narrow-leaf lupin (Lupinus angustifolius). The experimental ingredients did not appear to show any clear effects upon midgut macrostructure. At an ultrastructural level, the fish fed yellow lupin alone, displayed poorest brush border characteristics but those fed yellow lupin and the SSF product showed signs of amelioration since they did not differ significantly from those fed narrow-leaf lupin. Focus was then turned towards a yellow lupin-based diet in rainbow trout, with two inclusion levels of the SSF product. The SSF product significantly improved growth performance and feed efficiency at 0.5 %, with values closer to a fishmeal-based diet than the lupin control. The SSF product increased the digestibility of protein and energy and bioavailability of numerous elements. However, the digestibility and bioavailability of certain nutrients, e.g. fibre and Zn, were only increased with a 0.5 % inclusion. The SSF product influenced vertebral Ca:P ratio but no effect on vertebral morphology was identified. Fish fed yellow lupin kernel meal displayed high Mn concentrations throughout a number of tissues. The intestinal environment was explored in depth, revealing large differences dependent upon SSF product inclusion rate. Fish fed a 0.1 % inclusion exhibited deteriorated brush border characteristics and high diversity of microbes, including increased proportions of key salmonid pathogens. Those fed a 0.5 % inclusion displayed signs of increased surface area at an ultrastructural level, reduced goblet cell numbers and a low microbial diversity; with domination of one particular family, Enterobacteriaceae. Activities of alkaline phosphatase and leucine aminopeptidase within the anterior intestine also appeared to be influenced by SSF product inclusion. Variations in haemato-immunological parameters were also observed between the treatments. In the final experiment, the SSF product was applied, pre-extrusion, to a contemporary rainbow trout formulation, at 0, 0.5, 1.0 and 1.5 %. No significant improvements to performance were identified following SSF product inclusion. However, crude protein digestibility from SSF-supplemented diets was significantly higher than the control and tendencies towards elevated retention of Ca, P, and Mg were apparent. In vitro analysis of free-phosphate release was conducted upon pre- and post-extruded diets, at varying temperatures. This indicated that neither extrusion conditions (105 °C) nor an ambient temperature of 10 °C were sufficient to cease P-liberating capabilities by the SSF product; suggesting that the two conditions combined limited the product’s efficacy in practice. This research evidenced that SSF products can be an effective means of improving the available nutrient profiles of compound diets for both omnivorous, warmwater and carnivorous, temperate finfish. Lupins are a promising alternative protein source but their nutritional value can be substantially improved by SSF product application. Exploration of the effects of SSF products on the intestinal environment revealed that both negative and positive effects on intestinal health can occur, which is highly dependent upon product inclusion rate. The holistic approaches adopted within this series of studies have seldom been performed on monogastric animals and thus provide valuable, transferable information for advancing knowledge in the application of SSF products, exogenous enzymes and lupins to farm animal feeds, in general.
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Goosen, Neill Jurgens. "Investigation of potential bio-active properties and effects on production performance of aquafeed ingredients derived from fish processing waste by way of enzymatic autolysis." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95907.
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Thesis (PhD) -- tellenbosch University, 2014.ENGLISH ABSTRACT: This study is part of the continuing global research effort dedicated to finding alternative aquafeed ingredients, which not only replace fish meal and fish oil as sources of essential nutrients in aquafeeds, but also provide specialist functional properties when included in feeds. Due to constraints in supply of fish meal and fish oil originating from wild capture fisheries, the continually growing aquafeed industry requires new sources of raw materials for the production of high quality feeds. The aim of the study was to investigate the specialist functional properties of feed ingredients (with emphasis on immune-stimulation potential) derived from fish processing waste after enzymatic hydrolysis by endogenous proteolytic enzymes (autolysis). Further aims were to (i) quantify effects of these feed ingredients on production performance of two species relevant to the South African aquaculture industry, namely Mozambique tilapia Oreochromis mossambicus and South African abalone Haliotis midae, (ii) compare performance to commercially available enzymatically produced feed ingredients, and (iii) separate the functional effects of these fish processing waste derived feed ingredients from the acid used to preserve them against bacterial spoilage during the autolysis process. Oil recovered after autolysis of rainbow trout viscera proved to be an attractive feed ingredient due to favourable effects on the non-specific cellular immune function of both Mozambique tilapia and South African abalone. However, in South African abalone, increased immune function due to inclusion of fish oil was accompanied by a significant decrease in production performance. The inclusion of hydrolysed proteins, obtained by autolysis of fish waste, in aquaculture feeds also improved non-specific immunity and survival of Mozambique tilapia significantly – independently of the preserving acid – although the same was not observed for South African abalone. Production performance was dependent on dietary hydrolysed protein inclusion levels in both species; excessive inclusion resulted in decreased production performance. The performance of dietary hydrolysed protein from autolysis and those from commercial production processes were significantly different, possibly as a result of different raw material origins and production processes. It is further shown that formic acid can contribute to improved water stability in abalone feeds, a novel mode of action not previously described. The study concludes that the simple autolysis process for processing of fish waste can provide aquafeed ingredients with immune stimulatory potential, which can contribute to improved production performance in the Mozambique tilapia and the South African abalone. The result can contribute to improved sustainability of the aquafeed industry, through substitution of fish meal and fish oil derived from capture fisheries with processed fish waste components.
AFRIKAANSE OPSOMMING: Hierdie studie vorm deel van die voortdurende en wêreldwye soeke na nuwe akwakultuur voerbestanddele wat nie net vismeel en –olie kan vervang as bron van noodsaaklike voedingstowwe nie, maar wat ook gespesialiseerde funksionele eienskappe openbaar wanneer dit in akwavoere ingesluit word. As gevolg van beperkings in die voorsiening van vismeel en –olie afkomstig vanaf wilde visserye, word die voortdurend groeiende akwavoer bedryf genoodsaak om nuwe grondstowwe te benut vir die vervaardiging van hoë kwaliteit voere. Die doelwit van die studie was om moontlike gespesialiseerde funksionele eienskappe (met spesifieke klem op potensiële immuun-stimulasie) van voerbestanddele te ondersoek wat herwin is vanaf reënboogforel proseseringsafval, na ensiematiese hidrolise d.m.v. endogene ensieme teenwoordig in die afval (outolise). Verdere doelwitte was om (i) effekte op produksie prestasie van hierdie bestanddele te kwantifiseer in twee akwakultuur spesies relevant tot die Suid- Afrikaanse bedryf (naamlik die Mosambiekse kurper Oreochromis mossambicus en die Suid- Afrikaanse perlemoen Haliotis midae), (ii) om produksie prestasie te vergelyk met kommersieel beskikbare voerbestanddele voorberei d.m.v. ensiemtegnologie, en (iii) om die moontlike effekte van die voerbestanddele te skei van die van die sure gebruik om die bestanddele te preserveer tydens die outolitiese proses. Daar is bevind dat olie herwin na outolise van reënboogforel ingewande ‘n goeie voerbestanddeel is wat gunstige effekte op die nie-spesifieke, sellulêre immuniteit van beide Mosambiekse kurper en Suid-Afrikaanse perlemoen gehad het. In die Suid-Afrikaanse perlemoen het verbeterde immuunfunksie gepaard gegaan met ‘n verswakking in produksie prestasie. Die gehidroliseerde proteïen komponent van ge-outoliseerde prosesseringsafval het ook beduidende verbetering in nie spesifieke immuniteit en oorlewing van Mosambiekse kurper tot gevolg gehad - onafhanklik van die preserverende suur - maar dieselfde is nie in die Suid-Afrikaanse perlemoen waargeneem nie. Produksie prestasie was afhanklik van die insluitingsvlakke van gehidroliseerde proteïen in beide spesies en dit is bevind dat oormatige insluiting produksie nadelig beïnvloed. Prestasie van proteïen afkomstig van outolise en die van ‘n kommersiële produksieproses het beduidend verskil, moontlik as gevolg van verskillende grondstowwe en prosesseringstegnieke. Daar is verder vir die eerste keer getoon dat mieresuur ‘n beduidende verbetering in waterstabiliteit in sekere perlemoenvoere teweeg kan bring. Die studie kom tot die slotsom dat die eenvoudige outolise proses funksionele akwavoerbestanddele kan produseer wat kan bydra tot ‘n verbetering in produksie prestasie in die Mosambiekse kurper en Suid-Afrikaanse perlemoen. Die resultaat kan bydra tot verbeterde volhoubaarheid van die akwavoer bedryf, deur vismeel en –olie afkomstig van wilde visserye, te vervang.
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Choi, Wai Chuen. "Optimisation of soaking and thermal processing methods in reducing the trypsin, chymotrypsin and alpha-amylase inhibitors found in underutilised legumes for use as aquafeed." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52554/.
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In carnivorous fish farming industry, there are progressive increase demands for the finite resource of fish meal. A potential alternative to fish meal is to use legume meals which are free of enzyme inhibitors. In selected underutilised legumes the most effective processing method for eliminating trypsin (TIA), chymotrypsin (CIA) and alpha-amylase (AIA) inhibitors, without affecting the crude protein content, was investigated. These methods included soaking (S), wet heating (W), autoclaving (A) and dry freezing (D). No single method was effective at removing all the inhibitors. In all legumes tested, the combined processing methods which involved A were most effective in reducing CIA and AIA (p < 0.05), but not TIA. However, in adzuki bean both TIA and CIA were reduced by the D+A combined method (p < 0.05), whereas AIA of soybean and adzuki bean was decreased by combined methods of S+A (84.7 % and 99.3 % reduction respectively, p < 0.05) or A+D (99.1 % and 72.6 % reduction respectively, p < 0.05). All the processing methods retained 86.5 – 90.5 % of crude protein. Replacement of 10 % (w/w) of fish meal with D+A treated legume meal (either bambara groundnut or adzuki bean) for 28 days showed no significant difference in growth performance or inflammatory effects in Danio rerio or Lates calcarifer. Compared to Lates calcarifer given feed containing unprocessed adzuki bean meal, those on feed containing processed adzuki bean meal had increased hepatic gene expression of alanine aminotransferase (p < 0.01), indicating an enhanced ability to utilise amino acids. The project identified specific food processing methods which are effective at removing enzyme inhibitors in legumes, thereby facilitating the application of legumes as aquafeed ingredients. Future studies are required to examine what inclusion level of treated legume meal can promote growth performance in specific commercial fish species.
Books on the topic "Aquafeeds"
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Lorenzo, Jose M., and Jesus Simal-Gandara. Sustainable Aquafeeds. London: CRC Press, 2021. http://dx.doi.org/10.1201/9780429331664.
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Sunil, Siriwardena, Hasan Mohammad R, and Food and Agriculture Organization of the United Nations, eds. Impact of rising feed ingredient prices on aquafeeds and aquaculture production. Rome: Food and Agriculture Organization of the United Nations, 2009.
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Zaher, M., L. Luu, and W. Jainrarolai. Farm Made Aquafeeds. Daya Publishing House,India, 1998.
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Org, Food and Agriculture. Farm-made Aquafeeds (FAO Food & Nutrition Papers). Food & Agriculture Organization of the United Nations (FAO), 1996.
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1950-, Moehl John Frederic, Halwart Matthias, and Food and Agriculture Organization of the United Nations., eds. A synthesis of the formulated animal and aquafeed industry in Sub-Saharan Africa. Rome: Food and Agricultural Organization of the United Nations, 2005.
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Hasan, Mohammad R., Thomas A. Shipton, Pedro B. Bueno, and Pedro B. Bueno. Aquafeed Value Chain Analysis and a Review of Regulatory Framework of Striped Catfish Farming in Viet Nam. Food & Agriculture Organization of the United Nations, 2020.
Find full textBook chapters on the topic "Aquafeeds"
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Sicuro, Benedetto. "The Real Meaning of Ornamental Fish Feeds in Modern Society." In Sustainable Aquafeeds, 113–20. London: CRC Press, 2021. http://dx.doi.org/10.1201/9780429331664-6.
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Olmos, Jorge, and Victor Mercado. "Use of Alternative Ingredients and Probiotics in Aquafeeds Formulation." In Sustainable Aquafeeds, 21–56. London: CRC Press, 2021. http://dx.doi.org/10.1201/9780429331664-2.
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Robles, Vanesa, Marta F. Riesco, and David G. Valcarce. "Feed Industry Initiatives." In Sustainable Aquafeeds, 315–40. London: CRC Press, 2021. http://dx.doi.org/10.1201/9780429331664-11.
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Agregán, Rubén, Ruben Dominguez, Roberto Bermúdez, Mirian Pateiro, and Jose M. Lorenzo. "New Trends in Aquafeed Formulation and Future Perspectives." In Sustainable Aquafeeds, 77–90. London: CRC Press, 2021. http://dx.doi.org/10.1201/9780429331664-4.
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Rodríguez-Bermúdez, Ruth, Paulo E. S. Munekata, Mirian Pateiro, Ruben Dominguez, and José Manuel Lorenzo. "Antibiotics in Aquaculture Systems." In Sustainable Aquafeeds, 1–20. London: CRC Press, 2021. http://dx.doi.org/10.1201/9780429331664-1.
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Wacyk, Jurij, M. V. Jose Manuel Yañez, and Rodrigo Pulgar. "Enhancing Feed Utilization in Cultured Fish." In Sustainable Aquafeeds, 293–314. London: CRC Press, 2021. http://dx.doi.org/10.1201/9780429331664-10.
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Mozanzadeh, Mansour Torfi, Fatemeh Hekmatpour, and Enric Gisbert. "Fish Oil Sparing and Alternative Lipid Sources in Aquafeeds." In Sustainable Aquafeeds, 185–292. London: CRC Press, 2021. http://dx.doi.org/10.1201/9780429331664-9.
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Gullón, Patricia, Gonzalo Astray, Sara García-González, Fotini Kokou, and José Manuel Lorenzo. "Life Cycle Assessment for Sustainable Improvement of Aquaculture Systems." In Sustainable Aquafeeds, 121–38. London: CRC Press, 2021. http://dx.doi.org/10.1201/9780429331664-7.
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Ragaza, Janice Alano, Md Sakhawat Hossain, and Vikas Kumar. "The Potential of Invasive Alien Fish Species as Novel Aquafeed Ingredients." In Sustainable Aquafeeds, 57–76. London: CRC Press, 2021. http://dx.doi.org/10.1201/9780429331664-3.
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Barroso, Fernando G., Cristina E. Trenzado, Amalia Pérez-Jiménez, Eva E. Rufino-Palomares, Dmitri Fabrikov, and Maria José Sánchez-Muros. "Innovative Protein Sources in Aquafeeds." In Sustainable Aquafeeds, 139–84. London: CRC Press, 2021. http://dx.doi.org/10.1201/9780429331664-8.
Full textConference papers on the topic "Aquafeeds"
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"TECHNO-ECONOMIC ANALYSIS (TEA) OF EXTRUDED AQUAFEEDS." In 2014 ASABE Annual International Meeting. American Society of Agricultural and Biological Engineers, 2014. http://dx.doi.org/10.13031/aim.20141911088.
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"Techno-Economic Analysis (TEA) and Life-cycle Assessment (LCA) of Extruded Aquafeed." In 2015 ASABE International Meeting. American Society of Agricultural and Biological Engineers, 2015. http://dx.doi.org/10.13031/aim.20152189586.
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Hamid, Noor Khalidah Abdul. "Sustainable Aquafeed: Alternative Ingredients Produced Locally as Nutrient Complementary in Minimizing the Use of Fishmeal." In 2nd International Conference on Veterinary, Animal, and Environmental Sciences (ICVAES 2020). Paris, France: Atlantis Press, 2021. http://dx.doi.org/10.2991/absr.k.210420.002.
Full textReports on the topic "Aquafeeds"
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Mitchell, Brian G., Amir Neori, Charles Yarish, D. Allen Davis, Tzachi Samocha, and Lior Guttman. The use of aquaculture effluents in spray culture for the production of high protein macroalgae for shrimp aqua-feeds. United States Department of Agriculture, January 2013. http://dx.doi.org/10.32747/2013.7597934.bard.
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The FAO has projected a doubling in world demand for seafood during the 21 ed from aquaculture of marine fish and shrimps fed primarily on fishmeal-based aquafeeds. However, current practices of high intensity monoculture of shrimp in coastal ponds and fish in offshore pens have been strongly criticized as being ecologically and socially unsustainable. This view derives from un- checked eutrophication of coastal marine ecosystems from fish farm effluents, and the destruction of coastal estuarine ecosystems by shrimp farm constructions, plus aquaculture’s reliance on wild-caught small fish - which are excellent food for humans, but instead are rendered into fishmeal and fish oil for formulating aquafeeds. Fishmeal-sparing and waste- reduction aquafeeds can only delay the time when fed aquaculture product are priced out of affordability for most consumers. Additionally, replacement of fishmeal protein and fish oil by terrestrial plant sources such as soybean meal and oil directly raises food costs for human communities in developing nations. New formulations incorporating sustainably-produced marine algal proteins and oils are growing in acceptance as viable and practical alternatives. This BARD collaborative research project investigated a sustainable water-sparing spray/drip culture method for producing high-protein marine macrophyte meals for incorporation into marine shrimp and fish diets. The spray culture work was conducted at laboratory-scale in the USA (UCSD-SIO) using selected Gracilariaand Ulvastrains isolated and supplied by UCONN, and outdoors at pilot-scale in Israel (IOLR-NCM) using local strains of Ulvasp., and nitrogen/phosphorus-enriched fish farm effluent to fertilize the spray cultures and produce seaweed biomass and meals containing up to 27% raw protein (dry weight content). Auburn University (USA) in consultation with TAMUS (USA) used the IOLR meals to formulate diets and conduct marine shrimp feeding trials, which resulted in mixed outcomes, indicating further work was needed to chemically identify and remove anti-nutritional elements present in the IOLR-produced seaweed meals.