Academic literature on the topic 'Alternative fishing technique'
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Journal articles on the topic "Alternative fishing technique"
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Soetaert, Maarten, Annemie Decostere, Hans Polet, Bart Verschueren, and Koen Chiers. "Electrotrawling: a promising alternative fishing technique warranting further exploration." Fish and Fisheries 16, no. 1 (July 5, 2013): 104–24. http://dx.doi.org/10.1111/faf.12047.
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Haasnoot, Tim, Marloes Kraan, and Simon R. Bush. "Fishing gear transitions: lessons from the Dutch flatfish pulse trawl." ICES Journal of Marine Science 73, no. 4 (February 1, 2016): 1235–43. http://dx.doi.org/10.1093/icesjms/fsw002.
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Abstract This paper focuses on the transition in the Dutch cutter fleet-targeting flatfish, from the conventional beam trawl to the pulse trawl fishing gear. In doing so, we explore the process of gear transition, presenting the challenges that fishers and policy-makers face. The pulse trawl technique represents a particularly controversial gear transition as it makes use of electricity, which has been banned by the European Union since 1988. However, it is seen by those developing it in the Netherlands as an important alternative fishing gear to the conventional beam trawl technique, which is becoming increasingly inefficient with rising fuel prices and well-documented impact on benthic habitats. By using a multi-level perspective on socio-technical transitions as the analytical framework, we explore the development of the pulse trawl and the interaction between different levels. We also discuss the influence of technology-push on its transition into practice and regulation. This paper demonstrates the importance of social dimensions in the adoption of new fishing gears and in doing so contributes to our knowledge on how technological transitions in fisheries can be managed.
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Adiyanto, F., A. D. P. Fitri, and A. Ghofar. "The strategy of Small-scale fisheries management in Cilacap Regency Waters." Ecology, Environment and Conservation 28, no. 08 (2022): S478—S485. http://dx.doi.org/10.53550/eec.2022.v28i08s.072.
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Management of small-scale fisheries resources is more likely to be oriented towards economic growth by overexploiting fishery resources without paying attention to sustainability aspects. The number of smallscale fishing fleets tends to increase, resulting in over-exploitation in coastal areas. The purpose of this study is to develop alternative strategies for small-scale capture fisheries management in Cilacap Regency. Collecting data using survey methods and interviews with key informants. Sampling was done by purposive sampling technique. Data were analyzed using the AWOT method, namely the SWOT method combined with AHP. The results showed that the IFAS matrix value is 3.17 (strength = 2.211 and weakness is 0.715) the total value of EFAS is 2.926 (opportunity = 2.211 and threat = 0.715). The choice of strategy is in quadrant IV (growth and constructive conditions). Strategic priorities that can be taken include, increase productivity with environmentally friendly fishing gear, optimize fishing facilities and infrastructure assistance, strengthen the role of fishermen’s organizations or groups, increase human resource capacity through training and empowerment programs for fishermen and capital assistance for fishing business development.
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Reis-Filho, José Amorim, and Tommaso Giarrizzo. "Drone Surveys Are More Efficient and Cost Effective Than Ground- and Boat-Based Surveys for the Inspection of Fishing Fleet at Harbors." Coasts 2, no. 4 (December 16, 2022): 355–68. http://dx.doi.org/10.3390/coasts2040018.
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Generating accurate estimates of the number of vessels in fishing ports using traditional methods (i.e., ground- and boat-based) can be challenging as observations are distorted by an horizontal perspective. Automated inspection using drones is an emerging research alternative for this type of investigation. However, the drone-based and ground- and boat-based survey methods have not been quantitatively compared for small-scale and commercial fishing fleets in their ports. The objective of this study was to determine the number of fishing vessels and detect onboard fishing gear using three independent sources of data along 41 ports across the Brazilian coastline. Proved by statistical significance, the drone-derived vessel counts revealed 17.9% and 26.6% more fishing vessels than ground- and boat-based surveys, respectively. These differences were further highlighted during the assessment of ports without a ground walkway, causing difficulty, especially for ground-based surveys. Considerable numbers and types of onboard fishing gear were detected using the drone survey, that could not be detected using the ground- and boat-based methods. Although the ground-based survey was associated with a lower cost in comparison with other methods, the drone-based survey required the least time to record fishing fleet features in study ports. Our findings demonstrate that drone surveys can improve the detection and precision of counts for fishing vessels and fishing gear in ports. Further, the magnitude of the discrepancies among the three methods highlights the need for employing drone surveys as a considerable time-reducing approach, and a cost-effective technique for fishery studies.
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Chen, Junde, Min Li, Ruizao Yi, Kaikai Bai, Guangyu Wang, Ran Tan, Shanshan Sun, and Nuohua Xu. "Electrodialysis Extraction of Pufferfish Skin (Takifugu flavidus): A Promising Source of Collagen." Marine Drugs 17, no. 1 (January 4, 2019): 25. http://dx.doi.org/10.3390/md17010025.
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Collagen is widely used in drugs, biomaterials, foods, and cosmetics. By-products of the fishing industry are rich sources of collagen, which can be used as an alternative to collagen traditionally harvested from land mammals. However, commercial applications of fish-based collagen are limited by the low efficiency, low productivity, and low sustainability of the extraction process. This study applied a new technique (electrodialysis) for the extraction of Takifugu flavidus skin collagen. We found electrodialysis to have better economic and environmental outcomes than traditional dialysis as it significantly reduced the purification time and wastewater (~95%) while maintaining high extraction yield (67.3 ± 1.3 g/100 g dry weight, p < 0.05). SDS-PAGE, amino acid composition analysis, and spectrophotometric characterization indicated that electrodialysis treatment retained the physicochemical properties of T. flavidus collagen. Heavy metals and tetrodotoxin analyses indicated the safety of T. flavidus collagen. Notably, the collagen had similar thermal stability to calf skin collagen, with the maximum transition temperature and denaturation temperature of 41.8 ± 0.35 and 28.4 ± 2.5 °C, respectively. All evidence suggests that electrodialysis is a promising technique for extracting collagen in the fishing industry and that T. flavidus skin collagen could serve as an alternative source of collagen to meet the increasing demand from consumers.
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Syaukani, Marwan, Muhammad Fedi Alfiadi Sondita, Daniel Monintja, Akhmad Fauzi, and Victor Petrus Hiliary Nikijuluw. "KLASIFIKASI SENTRA INDUSTRI PERIKANAN BERBASIS PELABUHAN PERIKANAN: KASUS DI KABUPATEN BELITUNG." Jurnal Kebijakan Perikanan Indonesia 2, no. 1 (February 3, 2017): 1. http://dx.doi.org/10.15578/jkpi.2.1.2010.1-14.
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Klasifikasi pelabuhan perikanan Indonesia yang terdiri atas PelabuhanPerikanan Samudera, Pelabuhan Perikanan Nusantara, Pelabuhan PerikananPantai, dan Pusat Pendaratan Ikan. Klasifikasi tersebut di atas didasari hubungan inti plasma di mana pelabuhan perikanan yang besar ditunjang beberapa pelabuhan perikanan yang lebih kecil (Direktorat Jenderal Perikanan Tangkap, 2008). Hubungan inti plasma tersebut tidak berjalan karena tidak mempunyai pola hubungan yang jelas. Oleh sebab itu diperlukan alternatif klasifikasi pelabuhan perikanan dengan memasukan unsur jaringan industri seperti yang diusulkan oleh Israel & Rouqe (2000) yang mengklasifikasikan pelabuhan perikanan menjadi tiga yaitu penyedia jasa utama, penyedia jasa antara (server), dan client. Penelitian ini bertujuan menentukan klasifikasi sentra industri perikanan berbasis pelabuhan perikanan dalam jaringan industri yang efektifdan efisien dilakukan di Kabupaten Belitung selama 11 bulan sejak Oktober 2007 sampai Agustus 2008. Metode yang dipergunakan adalah multi criteria analysis yang dilanjutkan dengan analisis technique for order preference by similarity to ideal solution. Parameter yang diukur meliputi infrastruktur pelabuhan perikanan, kapasitas kapal perikanan, kemandirian faktor input, dan produksi. Hasil penelitian menunjukan bahwa Pulau Belitung berperan sebagai penyedia jasa utama, Pulau Mendanau, dan Pulau Seliu berperan sebagai penyedia jasa antara (server), dan Pulau Gersik dan Pulau Sumedang berperan sebagai client.Klasifikasi pelabuhan perikanan dalam suatu jaringan industri berimplikasi pada peningkatan efektivitas dan efisiensi pembangunan pelabuhan perikanan tangkap sebagai sentra industri perikanan tangkap.Indonesian government classify fishing port into 4 categories namely Ocean Fishing Port, National Fishing Port, Sea Shore Fishing Port, and Fish Landing Fishing Port. The above classification based on partnership or lingkage industry among fishing ports. However, the lingkage industry do not run effectively due to unappropriate pattern. Improving the condition, Israel & Roque (2000) suggested to classify fishing port into 3 categories namely main service provider, intermediate service provider or server, and client. This paper describes an alternative formula that considers industrial linkage among fishing ports as fishing industrial centers. The research was held on Belitung Regency as long as 11 months from October 2007 to August 2008. There are several factors should be considered in building fishing port namely fishing facilities, fishing capacity, input dependency and fish landing capacity. The 4 factors are analyzed by multi criteria analysis then continued by technique for order preference by similarity to ideal solution analysis. The research concludes that the Belitung is as the main service provider, the Mendanau Island and Seliu Islands are as the intermediate service provider or server, the other 2 islands are as the client. The new classification will increase effectiveness and efficiency of fishing port developments.
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Martins, Viviane S., Francisco José Bezerra Souto, and Alexandre Schiavetti. "Conexões entre pescadores e polvos na comunidade de Coroa Vermelha, Santa Cruz Cabrália, Bahia." SITIENTIBUS série Ciências Biológicas 11, no. 2 (March 27, 2012): 121. http://dx.doi.org/10.13102/scb69.
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Coral reefs are one of the most diverse ecosystems in the world and apart from carrying out important ecologicalfunctions, they have an important socioeconomic role because they are source of income and livelihoods for severalcommunities. Coroa Vermelha, is a district of Santa Cruz Cabrália, State of Bahia, and, together with the northern portionof Porto Seguro, it comprises the Coroa Vermelha APA (Environmental Protection Area). The artisanal fishing of octopusstill plays an important role for the local population, although tourism is a more promising alternative. This study coversthe behaviour of the octopus fishermen from Coroa Vermelha relating to their catch, other elements of the ecosystem, andpossible conservation implications, following a broad ethnoecological approach. Non-structured interviews, followed bysemi-structured and structured interviews, with randomly selected octopus fishermen and with “native specialists”, werecarried out. The semi-structured interviews were recorded and transcribed verbatim. The technique of direct observation,when fishermen were accompanied during the fishing, was also used. Twenty fishermen were interviewed; eight of whomwere considered “native specialists”. Two techniques of capture were reported, the catching of octopus over the reef andthrough diving, and five sampling points were cited as the most frequently fished by the local octopus fishermen. Amongstthe proposed interactions, that of human/plant interactions was found to be the weakest and that of human/animal thestrongest when fishing for octopus.
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Norris, James G. "Further Perspectives on Yield per Recruit Analysis and Biological Reference Points." Canadian Journal of Fisheries and Aquatic Sciences 48, no. 12 (December 1, 1991): 2533–42. http://dx.doi.org/10.1139/f91-294.
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Spawner–recruit relationships (SRRs) are indeterminate for most species. Earlier workers proposed solving "amount of harvest" problems for such cases by tacitly assuming that the SRR is density independent (a straight line through the origin) for the available data. I extend that concept and demonstrate a technique for solving "method of harvest" problems when the SRR is indeterminate. This technique uses spawning biomass per recruit, rather than fishing effort, as the benchmark for comparing alternative methods of harvest. Yields from different harvesting methods are deemed comparable only when they produce the same spawning biomass per recruit. If the comparisons are consistent over the entire range of spawning biomass per recruit values, one can evaluate the relative merits of competing methods of harvest without the benefit of spawner–recruit data. Although this technique does not determine the optimal gear selectivity, it allows comparisons of sustainable yields from currently available gear types. The technique is particularly useful for analyzing fishery allocation and by-catch problems. Two life history parameters, critical age (age at which a cohort maximizes its biomass or dollar value) and the age at 50% sexual maturity, may be most important in determining the optimal method of harvest (fishing gear selectivity).
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A. Mousa, Mohammed. "Tensile Behavior of Alternative Reinforcing Materials as Fiber Reinforced Cementitious Mortar FRCM." International Journal of Engineering & Technology 7, no. 4.20 (November 28, 2018): 239. http://dx.doi.org/10.14419/ijet.v7i4.20.25933.
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The adoption of new reinforcing and retrofitting materials provide an alternative and affordable techniques that can be utilized in low-income communities. FRCM is comprised of a broad spectrum family of reinforcing materials such that it allowed utilizing affordable local alternatives such as fishing net FN and welded wire steel mesh WWSM. The composite effectiveness stems from the compatible inorganic matrix properties which have similar properties to the substrate unlike other composites such as FRP. The tensile response of FN and WWSM and their mortar composites has been experimentally studied to characterize their strength, deformation, and the bonding between the reinforcement and the mortar. Experimental investigations on dog-bone composites specimens with their materials samples subjected to uniaxial tensile load were performed. The experimental campaign included testing 12 composite specimens taking into account multiple parameters like material, thread thickness, and the layer effect. The results show comparable strengths and high deformation capacity (12.5 times) of FN to the WWSM. Finally, the SEM imaging shows a well-impregnation between the mortar and the reinforcement of both materials. The tensile response of the composite emphasizes its potential as structural retrofitting and hazard mitigation technique for local builders and house owners in developing countries.
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Hiariey, Johanis, and Mulyono Sumitro Baskoro. "KAPASITAS PERIKANAN PELAGIS KECIL DI WILAYAH PENGELOLAAN PERIKANAN-714 LAUT BANDA MALUKU." Jurnal Kebijakan Perikanan Indonesia 2, no. 1 (February 3, 2017): 43. http://dx.doi.org/10.15578/jkpi.2.1.2010.43-56.
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Kapasitas penangkapan berlebih merupakan suatu masalah kritis padaperikanan tangkap. Berkaitan dengan isu kapasitas tersebut, kajian ini dilakukan untuk menentukan kapasitas penangkapan ikan pelagis kecil di wilayah pengelolaan perikanan-714 Laut Banda, dengan menggunakan data runtun waktu periode tahun 1985-2006 yang dianalisis dengan teknik data envelopment analysis. Terdapat indikasi excess capacity pada perikanan pelagis kecil, dan pada periode tahun 1989-1998 kondisi perikanan menunjukan over capacity. Dengan demikian, dibutuhkan alternatif kebijakan pengelolaan perikanan untuk mengurangi input penangkapan pada perikanan di wilayah pengelolaan perikanan-714 Laut Banda.Excessive fishing capacity is a critical problem in marine capture fisheries. In line with the capacity issue, this study was conducted to determine fishing capacity of the small pelagic fishery at fishery management area-714 Banda Sea using time series data of 1985-2006 analyzed using technique of data envelopment analysis. There was indication of excess capacity on the small pelagic fishery, and the fishery in the period of 1989-1998 was found to be over capacity. Therefore, alternative fishery management policies were needed to reduce fishing inputs from the fishery of the fishery management area-714 Banda Sea.
Dissertations / Theses on the topic "Alternative fishing technique"
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Macher, Claire. "Productions jointes et mesures de gestion des pêcheries mixtes : application à la pêcherie chalutière langoustinière du golfe de Gascogne." Phd thesis, Université de Bretagne occidentale - Brest, 2008. http://tel.archives-ouvertes.fr/tel-00361589.
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L'utilisation d'engins de pêche peu sélectifs dans un écosystème multi-spécifique et multi-taille engendre la capture de plusieurs catégories désirées ou non désirées, débarquées ou rejetées. Une analyse bioéconomique des processus de production utilisant des engins de pêche peu sélectifs dans le cas de la pêcherie chalutière langoustinière du golfe de Gascogne est présentée dans un premier temps en distinguant une étape de capture et une étape de tri. Nous montrons que toutes les productions ne sont pas jointes. Il existe une certaine maîtrise des productions jointes, essentielle du point de vue de l'aménagement des pêcheries. Un modèle microéconomique de comportement de tri appréhendant les rejets comme la résultante d'une opération de tri permet de discuter les incitations au rejet. Les effets de mesures de limitation des conséquences négatives des productions jointes sont ensuite analysés. L'analyse théorique des enjeux de la sélectivité montre que les bénéfices sociaux de la sélectivité dépendent du niveau d'effort dans la pêcherie et que lorsque la sélectivité n'est pas observable, les pêcheurs ont intérêt individuellement à adopter la technique non sélective. Une analyse coût-bénéfice de scénarios d'amélioration de la sélectivité est ensuite réalisée à partir d'un modèle bioéconomique de simulation appliqué à la pêcherie langoustinière. L'endogénéisation des comportements met en évidence la complémentarité nécessaire entre mesures techniques et mesures de régulation de l'accès. L'exemple de la pêcherie au casier à langoustine de Loch Torridon (Ecosse) permet de discuter les conditions de rentabilité d'un engin de pêche alternatif dont la sélectivité est observable.
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Macher, Claire. "Productions jointes et mesures de gestion des pêcheries mixtes : application à la pêcherie chalutière langoustinière du golfe de Gascogne." Phd thesis, Brest, 2008. http://www.theses.fr/2008BRES6003.
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L’utilisation d’engins de pêche peu sélectifs dans un écosystème multi-spécifique et multi-taille engendre des productions jointes désirées, les prises accessoires et non désirées, les rejets. Ces productions jointes peuvent aggraver les conséquences des externalités négatives et complexifient par ailleurs les solutions classiques de gestion. La thèse décrit, dans une première partie, les processus de production utilisant des engins de pêche peu sélectifs dans le cas de la pêcherie chalutière langoustinière du golfe de Gascogne en distinguant une étape de capture et une étape de tri. L’analyse de la fonction de capture montre que toutes les productions ne sont pas jointes. Il existe une certaine maîtrise des productions jointes, essentielle du point de vue de l’aménagement des pêcheries. L’analyse des comportements microéconomiques de tri à partir d’une fonction de tri décrite par analogie avec la fonction de capture permet ensuite de discuter les incitations au rejet, Les rejets sont appréhendés comme la résultante d’une opération de tri. Les effets de mesures de limitation des conséquences négatives des productions jointes sont analysés d’un point de vue bio-économique dans une deuxième partie. L’analyse théorique des enjeux de la sélectivité montre que les bénéfices sociaux de la sélectivité dépendent du niveau d’effort dans la pêcherie et des coûts de l’effort et que lorsque la sélectivité n’est pas observable, les pêcheurs ont intérêt individuellement à adopter la technique non sélective. Une analyse coût-bénéfice de scénarios d’amélioration de la sélectivité est ensuite réalisée à partir d’un modèle bioéconomique de simulation appliqué à la pêcherie langoustinière. L’endogénéisation des comportements met en évidence la complémentarité nécessaire entre mesures techniques et mesures de régulation de l’accès: en l’absence de mesures sélectives, la régulation de l’accès est difficile à mettre en œuvre et l’amélioration de la sélectivité sans mise en place d’une régulation de l’accès, ne permet pas de résoudre les problèmes de surcapacité. L’exemple de la pêcherie au casier à langoustine de Loch Torridon (Ecosse) permet enfin de discuter les conditions de rentabilité d’un engin de pêche alternatif au chalut, le casier, dont la sélectivité est observable et dont l’utilisation n’engendre pas de productions jointes. La question de la rentabilité d’une activité casier dans la pêcherie langoustinière du golfe de Gascogne est discutée sous différentes conditions. Les phases de transition sont analysées et posent la question d’aides transitoires au changement technique. La nécessité d’une gestion spatialisée des activités est soulignée dans ce casThe use of poor selective gears in a multi-species and multi-size ecosystem induces desired joint productions corresponding to by-catches and unwanted joint productions that are discarded. These joint- productions can worsen external effects consequences and they complicate moreover classical right-based solutions to fisheries management. A bio-economic analysis of production process using low selective gear is presented in the first part of the thesis with an application to the Nephrops trawl fishery in the bay of Biscay. The production function is spilt into a catch function and a sorting function. The analysis of the catch function highlights that all productions are not joint productions. There is a kind of joint productions control by the fishermen that is useful to fisheries management. The analysis of microeconomic sorting behaviours, from a sorting function defined with analogy to the catch function, then enables to discuss incentives to discards. Discards are considered as an output of a sorting task. In the second part of this thesis, we present a bioeconomic analysis of management measures to reduce negative consequences of joint-productions. A theoric analysis of selectivity shows that social benefits of selectivity improvement depend on the level of effort in the fishery and on the costs of effort. Besides, it is shown that when selectivity is not observable, fishermen are incited to adopt non selective technique. A cost-benefit analysis of several scenarios of improving selectivity is then realized from a bio-economic simulation model applied to the Nephrops fishery. Endogenous behaviours highlight the need to combine technical measures with access regulation measures: when the fishery is non selective, access regulation is complicated to implement and improving selectivity without access regulating do not resolve overcapacity problems. The example of the Nephrops pot fishery in Loch Torridon (Scotland) then enables to discuss profitability conditions of an alternative fishing gear to trawl, pot, whose selectivity is observable and that does not produce joint productions. Profitability of a pot metier in the bay of Biscay is discussed under several conditions. Transition phases are analyzed and highlight the question of transitory subsidies to technical change. The need for a spatial management of these activities is underlined in this case
Books on the topic "Alternative fishing technique"
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Engle, Ed. Trout lessons: Freewheeling tactics and alternative techniques for the difficult days. Mechanicsburg, PA: Stackpole Books, 2010.
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Engle, Ed. Trout lessons: Freewheeling tactics and alternative techniques for the difficult days. Mechanicsburg, PA: Stackpole Books, 2010.
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Engle, Ed. Trout Lessons: Freewheeling Tactics and Alternative Techniques for the Difficult Days. Stackpole Books, 2010.
Find full textBook chapters on the topic "Alternative fishing technique"
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Goodman, Camille. "Enforcement Jurisdiction over Foreign Fishing in the EEZ." In Coastal State Jurisdiction over Living Resources in the Exclusive Economic Zone, 218–94. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780192896841.003.0006.
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This Chapter examines the coastal State’s enforcement jurisdiction over fishing activities in the exclusive economic zone (EEZ) under the 1982 United Nations Convention on the Law of the Sea (LOSC), including the boarding, inspection, arrest, and seizure of vessels, the prompt release procedure, and the imposition of penalties. The Chapter argues that this jurisdiction should be interpreted by reference to the overall scheme of the LOSC, taking into account not only the rights but also the responsibilities of the coastal State, as well as those of flag States, in order to meaningfully preserve the balance of interests that is at the heart of the sui generis regime for the EEZ. However, while the balance of interests is commonly invoked in the jurisprudence on enforcement, international courts and tribunals have generally taken a narrow approach to its application, seeking to balance specific, corresponding rights of flag and coastal States in a binary equation, rather than the broader set of rights and responsibilities that underpin the EEZ regime. Faced with these limitations, as well as the practical and financial challenges of carrying out the primarily physical enforcement measures envisaged in the LOSC, coastal States have developed a range of alternative approaches to achieve the same result. As this Chapter demonstrates, these include: the conduct of cooperative and collaborative enforcement activities; a variety of prescriptive techniques to prevent and deter illegal fishing activity; and the use of modern technology to deliver cost-effective and remote, ‘no-force’ enforcement jurisdiction.
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Huang, Yu-Xi, Shi-Jun Yue, Wen-Xiao Wang, and Yu-Ping Tang. "Advances in Computational Network Pharmacology for Traditional Chinese Medicine (TCM) Research." In Frontiers in Computational Chemistry: Volume 6, 193–234. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815036848122060007.
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Traditional Chinese Medicine (TCM) is a complementary and alternative medicine but possesses remarkable clinical efficacy in China and surrounding countries. Hence, systematic analysis and elucidation of the complex chemical basis and action mechanisms of TCM will be highly beneficial. Nowadays, the widespread application of network pharmacology has unveiled the mystery of TCM to some extent by constructing the relationship of “herb-compound-target-disease”. Moreover, it can promote the development of drug discovery, medical guidance, and the dissection of the syndrome in TCM. With the integration of computational techniques into network pharmacology, the efficiency of data mining and the accuracy of active compounds identification and target fishing have been improved, and the “herb-compound-targt-disease” network has been more systematically and comprehensively explained to reflect the holistic mechanisms of TCM. Therefore, a comprehensive overview of each aspect of the use of computational techniques in TCM network pharmacology is urgent. This chapter systematically dissects the core contents involved in TCM computational network pharmacology and highlights its application on TCM against COVID-19, and severs the cutting-edge study examples to compare and analyze the advantages and limitations of different computational techniques.
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Jeffs, Andrew, Carly Daniels, and Kevin Heasman. "Aquaculture of Marine Lobsters." In Fisheries and Aquaculture, 286–312. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190865627.003.0012.
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Marine lobsters include some of the most highly prized and valuable seafood species in the world. Accessible wild populations of edible lobster species are under increasing pressure from harvesting, habitat loss, disease, pollution and climate change. To provide an alternative supply, there have been extensive efforts to develop aquaculture methods for many species of marine lobsters, but with slow progress. A range of unfavorable biological attributes of marine lobsters has constrained their development for aquaculture, including complex life cycles, low fecundity, extended larval periods, slow growth, and cannibalism. A lack of knowledge of aspects of the fundamental biology of many species has also made it challenging to advance aquaculture techniques. Currently, the only extensive commercial aquaculture of marine lobsters occurs in Vietnam, with annual production of well over 1,000 t of spiny lobsters. This involves the wild capture and mariculture of early juveniles of several species of spiny lobsters in simple floating sea cages and feeding them on freshly caught marine life, mostly small coastal fish and benthic invertebrates. The success of this apparently simple technology indicates the opportunity for increased aquaculture production as soon as the recent advances in larval culture of spiny (Palinuridae) and slipper (Scyllaridae) lobsters can provide a large and sustainable source of juveniles. While viable larval culture methods for the American and European clawed lobsters (Homaridae) have been available for some time, more recent advances with compartmentalized land- and sea-based culture systems show promise in overcoming the cannibalistic behavior of these species, an essential step toward developing commercially viable aquaculture. The likely emergence of large-scale commercial aquaculture of marine lobsters in the next decade has the potential to provide an alternative supply of lobsters into global seafood markets, with the prospect of relieving fishing pressure on wild populations of marine lobsters.
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Abadilla, Miles, W. Ray McClain, Taku Sato, Luis M. Mejía-Ortíz, and Miguel A. Penna-Díaz. "Inland Crustacean Fisheries." In Fisheries and Aquaculture, 182–206. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190865627.003.0008.
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Freshwater crustacean inland fisheries are typically confined to small local areas that are associated with bodies of water, like rivers and swamps. They are small-scale fisheries, enough to supply the requirements for local commercial use, and considered mainly as a subsistence resource for small fishing communities. As such, inland crustacean fisheries exemplify a subsistence opportunity for small countries with limited economic power, particularly rural communities. Crustaceans are a relevant protein source alternative to fish, and they are often also associated with local gastronomical and cultural identity. Data for the most commonly caught species are often unavailable since these fisheries exist in remote areas where government or institutional monitoring is limited, making it difficult to obtain reliable data about small-scale fisheries. Nonetheless, the captured species and the techniques used are widely diverse. In inland fisheries, the main target species are prawns from the genus Macrobrachium, gathered within the tropics all over the world. Natural fisheries of crayfishes in their native range exist on several continents, with Procambarus clarkii, Pacifastacus leniusculus, and Astacus astacus as the main commercial species. Some of them have also become a fisheries resource in areas where they were introduced. The only terrestrial crab fishery is for an anomuran, the coconut crab Birgus latro. The future of most of these fisheries depends in part on the health of the water sources threatened by contamination and unrestricted waterways jeopardized by the construction of dam-like structures that block the migration of some species to complete their reproductive cycles. The creation of regulatory policies is key for keeping the fishery activity self-sustainable because most of the exploitation depends on wild populations. There are some conservation efforts implemented thanks to the relevant gastronomical value of the species, as well as to economically sustain local communities in remote areas.
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"Freshwater, Fish and the Future: Proceedings of the Global Cross-Sectoral Conference." In Freshwater, Fish and the Future: Proceedings of the Global Cross-Sectoral Conference, edited by Steven J. Cooke, Angela H. Arthington, Scott A. Bonar, Shannon D. Bower, David B. Bunnell, Rose E. M. Entsua-Mensah, Simon Funge-Smith, et al. American Fisheries Society, 2016. http://dx.doi.org/10.47886/9789251092637.ch6.
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<em>Abstract</em> .—The assessment process is fundamental to ensuring that inland fisheries are managed sustainably and valued appropriately so that they can support livelihoods, contribute to food security, and generate other ecosystem services. To that end, a global group of leaders in inland fishery assessment convened to generate a list of recommendations and specific actions for improving assessment of inland fisheries. Recommendations included the needs to assess the global contribution of inland fisheries to food security, develop and implement rigorous approaches to evaluate various inland fishery management actions, develop and implement creative approaches to improve the assessment of illegal fishing activities, and improve statistical data for unreported and unregulated catches in inland waters. The group also identified a need to develop standardized and defensible methods of biological assessment of inland fish and fisheries that include data collection, database management, and data sharing and reporting to reflect diverse ecosystem types. Moreover, it was recommended that assessment be designed to better inform inland fishery management and other sector planning and decision making at the appropriate scales (e.g., integrated water resource management) through stakeholder engagement, valuation of fisheries outputs, and identification of policy alternatives with consideration of trade-offs. The inherent diversity of inland fisheries in terms of ecological, socioeconomic, and governance attributes was recognized throughout the process of developing the suggested actions, including how such attributes combine to provide fisheries-specific contexts for management. Using appropriate and accessible communication channels is critical to more effectively package, present, and transfer information that raises awareness about inland fisheries values and issues; alter human behavior; and influence relevant policy and management actions. Creating mechanisms to facilitate dialogue among the diverse range of stakeholders is equally important. Improved assessment techniques should play a fundamental role in supporting sustainable inland fisheries management and contributing to food security and livelihoods, while also maintaining or improving ecological integrity.
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"Freshwater, Fish and the Future: Proceedings of the Global Cross-Sectoral Conference." In Freshwater, Fish and the Future: Proceedings of the Global Cross-Sectoral Conference, edited by Steven J. Cooke, Angela H. Arthington, Scott A. Bonar, Shannon D. Bower, David B. Bunnell, Rose E. M. Entsua-Mensah, Simon Funge-Smith, et al. American Fisheries Society, 2016. http://dx.doi.org/10.47886/9789251092637.ch6.
Full textAbstract:
<em>Abstract</em> .—The assessment process is fundamental to ensuring that inland fisheries are managed sustainably and valued appropriately so that they can support livelihoods, contribute to food security, and generate other ecosystem services. To that end, a global group of leaders in inland fishery assessment convened to generate a list of recommendations and specific actions for improving assessment of inland fisheries. Recommendations included the needs to assess the global contribution of inland fisheries to food security, develop and implement rigorous approaches to evaluate various inland fishery management actions, develop and implement creative approaches to improve the assessment of illegal fishing activities, and improve statistical data for unreported and unregulated catches in inland waters. The group also identified a need to develop standardized and defensible methods of biological assessment of inland fish and fisheries that include data collection, database management, and data sharing and reporting to reflect diverse ecosystem types. Moreover, it was recommended that assessment be designed to better inform inland fishery management and other sector planning and decision making at the appropriate scales (e.g., integrated water resource management) through stakeholder engagement, valuation of fisheries outputs, and identification of policy alternatives with consideration of trade-offs. The inherent diversity of inland fisheries in terms of ecological, socioeconomic, and governance attributes was recognized throughout the process of developing the suggested actions, including how such attributes combine to provide fisheries-specific contexts for management. Using appropriate and accessible communication channels is critical to more effectively package, present, and transfer information that raises awareness about inland fisheries values and issues; alter human behavior; and influence relevant policy and management actions. Creating mechanisms to facilitate dialogue among the diverse range of stakeholders is equally important. Improved assessment techniques should play a fundamental role in supporting sustainable inland fisheries management and contributing to food security and livelihoods, while also maintaining or improving ecological integrity.
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"Anadromous Sturgeons: Habitats, Threats, and Management." In Anadromous Sturgeons: Habitats, Threats, and Management, edited by Jörn Gessner, Gerd-Michael Arndt, Arne Ludwig, and Frank Kirschbaum. American Fisheries Society, 2007. http://dx.doi.org/10.47886/9781888569919.ch17.
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<em>Abstract</em>.—A century ago, sea sturgeon (Atlantic sturgeon <em>Acipenser oxyrinchus</em> and European sturgeon <em>A. sturio</em>) were prevalent in the fish communities of all major German rivers, both in the North and the Baltic Sea drainages. Since then, population sizes have decreased rapidly due to overfishing, pollution, and hydropower construction. The last catches in the Baltic drainage occurred in the late 1960s. Only individual captures of sturgeon have been reported in the last 30 years, the most recent being in Lake Ladoga (Russia) in 1984 and off the coast of Estonia in 1996, approximately 25 years after the disappearance of the species from the fishery. Today, sturgeon are considered extinct in German waters. In 1996, the Federal Agency for Nature Conservation, in cooperation with the Society to Save the Sturgeon, started the pilot phase of a remediation program involving assessment of the prerequisites for remediation. The first juvenile European sturgeon were transferred to the Leibniz-Institute of Freshwater Ecology and Inland Fisheries under a scientific cooperation agreement with the Centre d’Étude du Machinisme Agricole, du Rural, des Eaux et Forêts in May 1996. With these specimens, an ex situ measure was initiated. In addition, phylogenetic and population genetic analyses of the species were carried out using mitochondrial DNA and microsatellites. These genetic analyses of recent and historical material have proven the existence of two different species in what was previously considered the Baltic or common sturgeon. The Atlantic sturgeon has been identified as endemic in the Baltic Sea and the European sturgeon in the North Sea. According to morphological evidence based on archaeological samples, the Atlantic sturgeon invaded the Baltic Sea approximately 2,000 years ago and has been the only sturgeon species there for the last few centuries. These results led to the separation of the remediation activities in North Sea and Baltic Sea tributaries. Broodstock development using the northernmost populations of the Atlantic sturgeon is currently being carried out. Subsequent reproduction for restocking requires a sufficiently large broodstock and a genetic breeding plan based on pedigree analysis. As a further prerequisite, an evaluation of the status of critical habitat for the early life stages of Atlantic sturgeon in the Oder River has been performed in collaboration with the Institute for Inland Fisheries of Poland. Alternative fisheries techniques, based on data for the bycatch of exotic sturgeon, are being developed to reduce the fishing pressure on juvenile sturgeon upon release.
Conference papers on the topic "Alternative fishing technique"
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Kalwar, Ghulam Murtaza, Saad Hamid, Sharat Kishore, Abdulrahman A. Aljughayman, Nahr M. Abulhamayel, and Nasser F. Qahtani. "E-Line Powered Mechanical Tool Technologies Provide Efficient, Reduced Risk Solutions in Complex Intervention Operations." In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21393-ms.
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Abstract Latest developments in drilling and wellbore completion technologies lead to even more complex intervention conditions. Conventional techniques using slickline or coiled tubing are ill-suited for many of these conditions due to operational complexity, effectiveness, or efficiency. Powered mechanical intervention with e-line alleviates some of these limitations and opens lower risk intervention applications. This paper details two applications: a fishing operation that could not be performed with slickline or coiled tubing and a completion disk rupturing operation where the operator saved 1.5 days. Powered mechanical intervention is a combination of complementary technologies that enable "intelligently controlled intervention operations." Downhole tractors enable access into complex well trajectories. Surface-controlled, powered anchors coupled with a linear actuator can generate very high axial forces with precise and real-time downhole measurements of forces and displacement. Operating parameters can be monitored in real time to prevent damage to damaged completion components. Uncontrolled tool movement due to high differential pressures is prevented. Such precise control of downhole forces and movements enables complex intervention operations previously done with coiled tubing or a full workover. The first application example details a fishing operation. A retrievable plug along with its setting tool was stuck in the production tubing after prematurely setting. Multiple fishing attempts with heavy-duty slickline jars were unsuccessful. Coiled tubing was not deployed as its lack of force precision could have generated excessive downhole force and sheared the fish. An e-line-conveyed linear actuator tool was used to latch onto the fish with the help of an overshot and was released from the retrievable plugs by application of optimal, highly controlled, linear force to minimize damage. The second case involved rupturing a ceramic disk installed in completion. High differential pressure across the disk restricted the use of slickline which could have been damaged due to the high expected differential pressure. The alternative with coiled tubing milling requires a larger personnel and equipment footprint in addition to the associated HSE exposure and lack of efficiency. An innovative technique using the e-line linear actuator and a pointed chisel was devised and deployed. Real-time feedback from the tool sensors gave confirmation of the rupturing of various components of the ceramic disk, and the anchors eliminated any tool movement during pressure equalization. The operation was completed in 12 hours, resulting in time savings of almost 36 hours. An e-line intervention is a low risk, effective, and efficient solution while having an accurate depth and positioning, coupled with controlled downhole operations. With precise control of operating parameters, operations which were previously possible with coiled tubing or workover can be done on e-line more efficiently.
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Franco, Nata, Mauricio Corona, Mohamed AlMahroos, Thiago Kestring, and Adriano Oliveira. "Practical Guide to Successful Wireline Formation Pressure Testing Across Highly Deviated and Depleted Sections." In ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/211747-ms.
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Abstract Reaching bottom with logging tools is difficult when the well is highly deviated and has significant pressure overbalance. This often leads to mechanical and differential sticking risk on cable operations and the desired depth not being reached. The normal practice is to deploy formation testers on drill pipe (pipe conveyed logging – PCL). This paper aims to provide guidance to operators for performing safe and efficient wireline formation pressure testing jobs in challenging conditions, saving considerable rig time. It is critical to understand the factors which cause tool obstruction and cable sticking. This helps to optimize the conditions needed for successful wireline operations and prevents high-impact events, such as tools getting stuck, fishing operations, wiper trips, cancelled logging and PCL jobs. The main contributing factors were analyzed and divided into different categories: well design and trajectory, borehole conditions and geomechanics considerations, drilling fluid properties and wireline equipment selection. A tailored operational workflow with detailed risk assessment with prevention and mitigation measures were combined into a practical guide and then it was implemented to perform a series of jobs. Following the new systematic approach, wireline logging jobs could be safely conducted in several wells across 8-3/8" and 5-7/8" sections in a challenging drilling environment. The maximum inclination was 60° and maximum overbalance of 3,920 psi. The vast majority of planned pressure points were collected and there weren't held ups or overpulls observed during the operations. For the tester tool to reach the bottom, it was essential to have a proper well design and trajectory construction, good borehole quality with minimum disturbance and exposure, right mud weight selection together with fit-for-purpose drilling fluid and bridging plan. All best practices and lessons learnt, were put together to a guide and made available to the project team for future operations. This technique was adopted as the new standard for logging through carbonates formations in deviated sections in the field, with high depletion. As operational costs are a concern in long deviated logging, optimization done using alternative methods offer benefits in terms of rig time and efficiency. If the main risks aren't assessed properly, then it incurs significant costs and inefficiencies. This innovative multidisciplinary approach integrates different domains to perform wireline formation testing operations in a cost effective and time efficient manner when compared to running logs on drill pipe. This method will serve as a reference for operators and service providers to achieve step changes in similar operations. The key elements of this initiative will be described in detail in the paper.