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Journal articles on the topic 'Experimental fishing'
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1
Martell, Steven J. D., and Carl J. Walters. "Experimental policies for rebuilding depleted stocks." Canadian Journal of Fisheries and Aquatic Sciences 65, no. 8 (2008): 1601–9. http://dx.doi.org/10.1139/f08-061.
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Experimental policies for rebuilding stocks through reduction in fishing mortality rate can be classified by severity of the reduction and duration of application of the reduced rate before moving to a long-term fishing rate goal. For stocks ranging from highly productive shrimp (Penaeidae) in the Gulf of Mexico to longer-lived, less productive Atlantic yellowfin ( Thunnus albacares ) tuna, we show that highest expected long-term fishery values are likely to come from relatively harsh experiments (F reduced to lowest value likely to be optimum for the long term) for which there is a commitment to maintain the experimental fishing mortality rate for several generations. Shorter experiments and less severe reductions in fishing rate lead to high probabilities of poor choices for postexperimental fishing rate, while much longer experiments do not produce substantially more information yet forego opportunities for higher harvests.
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Nedostup, A. A., and P. V. Nasenkov. "Experimental studies of the characteristics of twisted fishing materials." Trudy VNIRO 198, no. 1 (2025): 123–29. https://doi.org/10.36038/2307-3497-2024-198-123-129.
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The purpose of the work is to develop mathematical dependencies of the physical and mechanical characteristics of twisted fishing materials. The creation of a mathematical apparatus for modeling the geometric and force parameters of twisted fishing materials is a priority task for the development of new materials for industrial fishing and aquaculture.Methods used: Mathematical analysis of the obtained experimental data on the relative elongation and breaking load of fishing materials in order to determine the dependence of the forces on the structural and geometric characteristics of twisted fishing materials.Novelty: Based on the results of experimental studies, approximating dependences of relative elongation and relative breaking load on the continuity of the product, as well as on the ratio of surface and longitudinal tension of twisted fishing materials made of polyamide, polypropylene and polyester, were obtained for the first time. Result: Mathematical dependencies make it possible to calculate the relative elongation and breaking load of twisted fishing threads and ropes made of polyamide, polypropylene and polyester within an accuracy of 90%.Practical significance: Mathematical modeling of the physical and mechanical characteristics of twisted fishing materials allows, when designing industrial fishing tools, to set, taking into account the safety margin, the design characteristics of fishing products that are made of polyamide, polypropylene and polyester.
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Prihantoko, Kukuh Eko, and Rafi Zulmy Saputra. "Fisheries Research Based on Experimental Fishing Methods in the Coastal Area of Rembang Regency, Central Java, Indonesia." Asian Journal of Fisheries and Aquatic Research 27, no. 1 (2025): 13–38. https://doi.org/10.9734/ajfar/2025/v27i1861.
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Rembang Regency coastal area is one of the central fishing production in Central Java Province. Various types of fishing gear are used by fishermen for fishing operations and are developed independently. Much research has been conducted in this area related to capture fisheries. This study aims to analyze the research development that uses experimental fishing methods. This study uses a systematic literature review method based on Published or Perish application tools. The results showed that 9 (nine) types of fishing gear were the object of research in the coastal area of Rembang Regency in 2013-2022. Experimental fishing methods have been carried out on 5 (five) types of fishing gear, namely small bottom trawl (arad), folding box traps (bubu lipat), longline (pancing rawai), squid jigging (pancing cumi), and gillnet (jaring insang). Experimental fishing research has been conducted on small bottom trawls, including towing speed and mesh size modification. Folding box traps were studied with escape gap and fishing time variables. Hooks and lines were studied with fish-hook materials and various bait variables. Gill net was studied with webbing modified. The results of this study provide knowledge of the potential for experimental fishing research that can be applied in the future, especially to understand fishing activities in the coastal areas of Rembang regency.
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Nedostup, A. A., A. O. Razhev, P. V. Nasenkov, et al. "Experimental studies of a midwater trawl 18/95 m in the Vishtynets Lake." Problems of Fisheries 24, no. 2 (2023): 92–98. http://dx.doi.org/10.36038/0234-2774-2023-24-2-92-98.
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The article presents the first experimental data on the operation of a mid-depth trawl 18/95 m for catching vendace (Coregonus albula) in Lake Vishtynets, Kaliningrad Region. Lake Vishtynets is a testing ground for the study of industrial fishing gear. The trawl was towed taking into account the capacities of two interconnected (in a catamaran) motor boats: «Wellboat» (motor with a capacity of 25 l / s or 18,3 kW). When designing a mid-depth trawl 18/95 m, data from experiments with a floating anchor and software «Computer-aided design system for industrial fishing gear (CAD-OR)» were used. The technical characteristics of the 18/95 m trawl project were obtained. These experiments were carried out on the basis of previous studies in the Fishering Service hydrochannel.
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Dudley, S. F. J., R. C. Haestier, K. R. Cox, and M. Murray. "Shark control: experimental fishing with baited drumlines." Marine and Freshwater Research 49, no. 7 (1998): 653. http://dx.doi.org/10.1071/mf98026.
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Protective gill-nets (shark nets) have been successful in reducing the frequency of shark attacks on the coast of KwaZulu-Natal (KZN), South Africa, since 1952. This is achieved primarily through a local reduction in numbers of large sharks. Yet the nets are non-selective in terms of shark species caught and take a by-catch of dolphins, sea turtles, batoids and teleosts. Baited lines, or drumlines, as used in the Queensland shark control programme, were tested as possible alternatives to gill-nets. They demonstrated greater species selectivity for sharks and also a reduced by-catch of non-shark animals. The shark catch included the three species responsible for most shark attacks on the KZN coast, Carcharhinus leucas, Galeocerdo cuvier and Carcharodon carcharias. The probability of the bait being scavenged, or a shark being caught, was modelled in relation to a number of physical environmental factors. Although there was insufficient variability in the effort data for a quantitative comparison of catch rates between nets and drumlines, the results suggested that an optimal solution may be to deploy a combination of nets and drumlines.
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Tauran, Adeline, Julien Dubreuil, Benjamin Guyonnet, and Jacques Grall. "Impact of fishing gears and fishing intensities on maerl beds: An experimental approach." Journal of Experimental Marine Biology and Ecology 533 (December 2020): 151472. http://dx.doi.org/10.1016/j.jembe.2020.151472.
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Serang, Abu Samad, Erna Almohdar, Wiwien G. Hukubun, Yanto Anwar, Erwin Tanjaya, and Fatmawati Marasabessy. "Differences in Fishing Time for By-Catch in Gill Net Fishing Gear in Selayar Waters." Agrikan Jurnal Agribisnis Perikanan 17, no. 2 (2024): 356–61. https://doi.org/10.52046/agrikan.v17i2.2305.
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This research was conducted from October to December 2022, located in Selayar Village, Southeast Maluku Regency. The aim of this research is to determine the main, by-catch and discarded catches and to determine the differences between morning and afternoon catches. The method used in this research is the experimental metal fishing method, namely, conducting direct observations in the field of the catch using gill net fishing gear, then identifying the type of fish for each catch, counting the number of fish and weighing the weight of the fish (kg). ). The method used is experimental fishing or experimental fishing, observation and interviews. the object used is the catch on the gill net fishing gear. The research results are described in graphical form. The research results showed the highest value of main catch during the day, by-catch during the day and discard catch also during the day.
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Keegan, William F. "The Ecology of Lucayan Arawak Fishing Practices." American Antiquity 51, no. 4 (1986): 816–25. http://dx.doi.org/10.2307/280868.
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Fishing is a form of predator-prey interaction. As such, the behaviors of fishes can be used to define a restricted range of human behaviors that resulted in their capture. In this report, ecological evidence, fishbone analysis, ethnohistoric reports for the prehistoric Caribbean, experimental fishtrap samples, and ethnographic reports of fishing in other coral waters are brought together in the analysis of prehistoric fishing in the Bahama Archipelago. The analysis is conducted at two levels. First, general fishing strategies are distinguished on the basis of behavioral evidence; and second, specific capture techniques are identified through comparisons with experimental fishtrap samples.
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Simier, Monique, Jean-Marc Ecoutin, and de Morais Luis Tito. "The PPEAO experimental fishing dataset: Fish from West African estuaries, lagoons and reservoirs." Biodiversity Data Journal 7 (February 14, 2019): e31374. https://doi.org/10.3897/BDJ.7.e31374.
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This paper describes a dataset of fish, crustacean and mollusc occurrences extracted from the "Experimental Fishing" section of the IRD's PPEAO information system. PPEAO stands for "Fish communities and artisanal fisheries of West African estuarine, lagoon and freshwater ecosystems". This database contains information collected using two different methods: experimental fishing and surveys of the artisanal fisheries that exploit these ecosystems. The database is accessible at http://ppeao.ird.fr. The current dataset is available on GBIF.org at 10.15468/ra4voa. It comprises the occurrences of 314 fish, crustacean and mollusc taxa collected in experimental sampling surveys of different aquatic ecosystems in West Africa between 1979 and 2013. Different types of fishing gear were used including purse seines, gill nets and fyke nets. The taxa were identified by IRD scientists or by scientific partners well trained in systematics. Most taxa were identified at species level (97% of cases). This dataset is the result of 213 fishing surveys, 5,362 fishing hauls and 31,709 occurrences (28,428 of fish taxa and 3,281 of crustaceans and molluscs). The number of individuals per species and per haul is included and 80% of occurrences are geolocated.
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Недоступ, А. А., А. О. Ражев, П. В. Насенков, et al. "Development of a physical model of the operation process of a mid-water trawl complex." MORSKIE INTELLEKTUAL`NYE TEHNOLOGII)</msg>, no. 1(59) (March 4, 2023): 237–44. http://dx.doi.org/10.37220/mit.2023.59.1.031.
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В статье авторы представляют смоделированную физическую траловую конструкцию и промысловую палубу рыболовного судна по теории мультифизического подобия траловых конструкций. Проведены экспериментальные исследования процессов эксплуатации модели тралового комплекса в гидроканале ООО «Фишеринг Сервис». Получена качественная картина динамических процессов тралового комплекса. Проведена сравнительная оценка модели промысловой машины, при смоделированном тралении с предоставленной моделью трала N-MWT-m2 1,65/6,0 м. Теоретически и экспериментально доказано обоснованность замены имитационной дели (число ниток, веревок и узлов в элементе дели). Проанализирована маневренность тралового комплекса и рыболовного судна для прицельности тралового лова и выполнения других промысловых операций с учетом ваера, качки и волнения. Все это выполнено для полномерной разработки физической модели процесса эксплуатации разноглубиного тралового комплекса. Все расчетные характеристики предварительно сделанные, были проверены во время экспериментальных исследований в гидроканале ООО «Фишеринг-Сервис». Экспериментальные исследования проводились с моделью разноглубиного трала методом: система «модель трала - голые концы - кабели - лапки - траловые доски - ваера». В ходе проведения экспериментов были получены геометрические и силовые параметры физической модели процесса эксплуатации разноглубинного тралового комплекса N-MWT-m2 1,65/6,0 м. Применено оборудование: пульт управления потоком воды в гидроканале; вертушка для измерения скорости потока воды: тензометрический комплекс MIC-200; миллиамперметр Ц4311; промысловая палуба (физическая модель) экспериментального рыболовного судна; эхолот Lowrance elite - 4xHDI; модель тралового комплекса N-MWT-m2 1,65/6,0 м. In the article, the authors present a simulated physical trawl structure and the fishing deck of a fishing vessel according to the theory of multiphysical similarity of trawl structures. Experimental studies of the operation processes of the model of the trawl complex in the hydrochannel of Fishering-Service LLC were carried out. A qualitative picture of the dynamic processes of the trawl complex has been obtained. A comparative evaluation of the model of a fishing machine was carried out during simulated trawling with the provided trawl model N-MWT-m2 1.65/6.0 m. Theoretically and experimentally proved the validity of replacing the imitation net (the number of threads, ropes and knots in the net element). Analyzed the maneuverability of the trawl complex and the fishing vessel was analyzed for the aiming of trawling and other fishing operations, taking into account warp, pitching and waves. All this was done for the full-scale development of a physical model of the process of operation of a mid-water trawl complex. All calculated characteristics, previously made, were verified during experimental studies in the hydraulic channel of Fishering-Service LLC. Experimental studies were carried out with a model of a mid-water trawl using the following method: the system "trawl model - bare ends - cables - legs - trawl doors - warps". In the course of the experiments, the geometric and power parameters of the physical model of the process of operation of the N-MWT-m2 1.65/6.0 m mid-water trawl complex were obtained. The following equipment was used: a water flow control panel in the hydrochannel; turntable for measuring the speed of water flow: strain gauge complex MIC-200; milliammeter Ts4311; fishing deck (physical model) of an experimental fishing vessel; echo sounder Lowrance elite - 4xHDI; model of the trawl complex N-MWT-m2 1.65/6.0 m.
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Stephenson, Fabrice, Aileen C. Mill, Catherine L. Scott, Nicholas V. C. Polunin, and Clare Fitzsimmons. "Experimental potting impacts on common UK reef habitats in areas of high and low fishing pressure." ICES Journal of Marine Science 74, no. 6 (2017): 1648–59. http://dx.doi.org/10.1093/icesjms/fsx013.
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Abstract Impacts of mobile fishing gears on habitat and benthos have been well-documented; in contrast, less studied physical impacts of static fishing gear on benthic habitats are still debated. Pot fishing, is a growing sector in the UK and evidence of any impacts is needed to inform management. This study simulated high intensity experimental pot fishing on the epibenthos of two common UK reef habitats in Northumberland, UK. Single tethered pots were fished in intensively and lightly fished areas over the course of 2 months. Within each area, three experimental sites and control sites were surveyed before and after fishing using photoquadrats (n = 240 per 290 m2 site) collected by scuba divers. PERMANOVA analysis indicated no evidence of epibenthic species abundances decreasing due to physical crushing or abrasion from potting on either intensively or lightly fished reefs. A shift in community composition over time was detected but was attributed to natural change as epibenthos in control sites shifted similarly. Experimental pot impacts far exceeded those of the local commercial pot fishery, providing relevant evidence for statutory governing bodies revisiting current fisheries management. Results are applicable across Western Europe due to the selection of habitats with abundant and commonly distributed benthic species.
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Nguyen, Luong Trong, Khanh Quoc Nguyen, and Toan Phi Nguyen. "Experimental Mixed Gillnets Improve Catches of Narrow-Barred Spanish Mackerel (Scomberomorus commerson)." Fishes 8, no. 4 (2023): 210. http://dx.doi.org/10.3390/fishes8040210.
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A new gillnet made from multiple mesh sizes ranging from 125 to 180 mm of stretched mesh (experimental gillnet) was tested under commercial fishing conditions to compare the fishing performance with that of conventional gillnets with a 125 mm mesh opening (control gillnet). Catch efficiency and size selectivity between the two gillnet types were evaluated throughout one year of fishing in three different locations in the waters of Vietnam. Experimental gillnets caught narrow-barred Spanish mackerel (Scomberomorus commerson), spotted mackerel (Scomberomorus guttatus), and wahoo (Acanthocybium solandri) in comparable amounts to the control gillnets, with the moon phase, month, and depth explaining some of the variation in the catch per unit effort (CPUE). An analysis of the size-dependent catch comparison rates and selectivity parameters showed that the experimental gillnets captured a wider range of narrow-barred Spanish mackerel sizes, but with a substantial proportion of individuals larger than those caught by the control gillnets. This is of higher weight per unit effort, and fishing enterprises therefore could improve their economic benefits by using modified gillnets with multiple mesh sizes. Our findings also support the biological and environmental benefits of the modified gillnet size selection, which might also extend to other species.
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Rintaka, W. E., and E. Susilo. "Validation of potential fishing zone forecast using experimental fishing method in Tolo Bay, Central Sulawesi Province." IOP Conference Series: Earth and Environmental Science 137 (April 2018): 012041. http://dx.doi.org/10.1088/1755-1315/137/1/012041.
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Firmansyah, Teguh, Zahidah Hasan, Eddy Afrianto, and Izza M. Apriliani. "PEMETAAN DAERAH PENANGKAPAN POTENSIAL IKAN LAYUR (Trichiurus sp) DI PERAIRAN PANGANDARAN, JAWA BARAT." Jurnal Airaha 7, no. 01 (2018): 006–12. http://dx.doi.org/10.15578/ja.v7i01.81.
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Fishing activity by catching gill nets by Pangandaran fishermen is using traditional methods inherited by ancestors especially in determining fishing ground such as seeing the color of water surface, small ripple, fish jump, the presence of foam, and see the existence of birds. Such activities make fishing activities less than optimal because the level of uncertainty is high and will impact on high operational costs such as the use of fuel wasted and trip time becomes longer. Knowledge of fishing zones is essential for fishing activities because by knowing potential fishing areas will result optimal catch and reduced effort. Information about potential fishing areas can be obtained through analysis of the distribution of a-chlorophyll in water. The research was doing from October to November 2017. The research used survey method with 7 experimental fishing activities in Pangandaran Waters. From the results of this activity can known that category distribution of fishing ground catchment area in Pangandaran spread from medium to potential category.
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FOX, HELEN E., PETER J. MOUS, JOS S. PET, ANDREAS H. MULJADI, and ROY L. CALDWELL. "Experimental Assessment of Coral Reef Rehabilitation Following Blast Fishing." Conservation Biology 19, no. 1 (2005): 98–107. http://dx.doi.org/10.1111/j.1523-1739.2005.00261.x.
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Brick, Kerri, Martine Visser, and Justine Burns. "Risk Aversion: Experimental Evidence from South African Fishing Communities." American Journal of Agricultural Economics 94, no. 1 (2012): 133–52. http://dx.doi.org/10.1093/ajae/aar120.
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Zhang, Liang, Bowen Xing, Xiao Chen, and Wugui Wang. "Ensemble Learning based Fishing Behavior Analysis for Vessels around Zhoushan Islands Erea." Journal of Physics: Conference Series 2213, no. 1 (2022): 012012. http://dx.doi.org/10.1088/1742-6596/2213/1/012012.
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Abstract In order to improve and verify the application value of AIS data in fishing behavior analysis, three existing models were chosen to analyze the fishing paths of more than 200 boats around Zhoushan Islands. In order to confirm their operation mode, F1-score was used to evaluate related models. Experimental results shown that the Lightgbm model embodies better performance in the analysis of fishing boat behavior with higher practicality.
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Wang, Peipei, Zefeng Feng, Haiyang Wang, Yang Song, Zhiliang Jin, and Daxi Xiong. "Establishment of transmission model for broad-spectrum artificial light in case 1 water." Optics Express 30, no. 18 (2022): 33353. http://dx.doi.org/10.1364/oe.464449.
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A new simulation model for light transmission of broad-spectrum artificial light in case 1 water is introduced in this paper. The model simulates spectrum changes of fishing lamps due to absorption and scattering of seawater. According to underwater spectrum changes, this model restores the light field generated by fishing lamps and demonstrates the distribution of visual stimuli to marine organisms. The accuracy of the transmission model is verified by comparing it with experimental data. In addition, by comparing the simulation results of light transmission models of different fishing lamps in seawater of various fishing grounds, we investigate why current light-emitting diode (LED) lights are not as effective as metal halide (MH) lamps for light fishing. Lastly, suggestions for future optimization of LED fishing lamps in terms of light distribution design and spectrum configuration are provided.
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Kim, Pyungkwan, Hyungseok Kim, and Seonghun Kim. "Application of Light-Emitting Diode Lights to Bluefin Sea Robin (Chelidonichthys spinosus) Catch in Pot Fishery in the South Sea, Korea." Applied Sciences 12, no. 9 (2022): 4149. http://dx.doi.org/10.3390/app12094149.
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The bluefin sea robin (Chelidonichthys spinosus), hereafter BSR, is one of the most important fish species in the South Sea of Korea. The production value of BSR in 2020 was USD 4,733,057. The production volume in Korea has shown an annual mean increase of 8.9% since 2010, but the efficiency of the fishing gear decreased due to excessive use. This has led to a decrease in the profitability of fishery operators, and as compensation, the use of fishing gear has further increased through competitive operations. Alternative measures for improving catch performance and reducing the use of fishing gear are needed. As one such measure, LED (Light-Emitting Diode) lights were attached to the pot, and the effects were determined. The field experiment results showed that the catch of BSR was higher for the experimental groups (n = 10–273) using fishing gear with LED lights (red, green, blue, and white) than for the control group (n = 2) (Kruskal–Wallis test, p < 0.05). Among the experimental groups, the pot with green light achieved the largest catch (n = 273). The use of LED lights was found to enhance the catch efficiency of pot fishing gear for BSR.
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Fajriah, Fajriah, Kobajashi Togo Isamu, Muhammad Nur, and Ahmad Mustafa. "Optimizing fishing time with Underwater Fish Lamp Plus (UFLPlus) technology: A strategy to enhance productivity and sustainability of boat lift net fisheries." BIO Web of Conferences 156 (2025): 03039. https://doi.org/10.1051/bioconf/202515603039.
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The UFLPlus technology is an innovative underwater fish lamp equipped with Closed Circut Television (CCTV). UFLPlus can enhance catch productivity by 41% and reduce fishing time, achieving an operational efficiency improvement of up to 33% in a single night. This innovation provides an effective and sustainable solution for lift net fisheries operating from boats. Boat lift net fishing methods often face challenges related to long fishing times, even when using submerged lamps as auxiliary tools. UFLPlus technology, with its optimal lighting system and integrated CCTV or image sensing. This study aims to evaluates the effectiveness of UFLPlus in improving the productivity of boat lift net fisheries by focusing on two key aspects: fishing time and productivity. It also compares UFLPlus with traditional underwater lamps without CCTV. Furthermore, it demonstrates that UFLPlus can significantly improve fishing time efficiency. The research was conducted in August 2024 in the boat lift net fishing grounds around Hari Island, South Konawe Regency, utilizing an experimental fishing method.
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Koeck, Barbara, Magnus Lovén Wallerius, Robert Arlinghaus, and Jörgen I. Johnsson. "Behavioural adjustment of fish to temporal variation in fishing pressure affects catchability: an experiment with angled trout." Canadian Journal of Fisheries and Aquatic Sciences 77, no. 1 (2020): 188–93. http://dx.doi.org/10.1139/cjfas-2019-0064.
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In passive fisheries, such as angling, the fishing success depends on the ultimate decision of a fish to ingest the bait, based on an individual’s internal state, previous experience, and threat perception. Fish surviving capture by anglers are known to be less vulnerable, and catch rates usually quickly decline with increasing fishing effort. Previous theoretical models have thus suggested fishing closures as a means to recover responsiveness of fish to angling gear and maintain catch rates, yet empirical support remains limited. In a controlled replicated pond experiment, we evaluated the effects of temporal variation in fishing pressure on catch rates of rainbow trout (Oncorhynchus mykiss) by simulating short-term fishing closures. Fishing closures increased catch rates and population-level catchability by reducing threat perception at the population level and allowing released individuals to return to a vulnerable state. Our experimental results show that periodic fishing closures benefit catch rates but at the risk of aggravating the likelihood of overharvesting.
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Julia Mizulni, Putri, Nanda Rizki Purnama, Ahmad Fauzan Lubis, Bunuatus Salma, and Maretty Twentina Dolorosa Butar-Butar. "Effect of hook size on the catch of hand line fishing at PPI Lambada, Aceh Besar." BIO Web of Conferences 156 (2025): 03030. https://doi.org/10.1051/bioconf/202515603030.
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Generally, fishermen in Lambada Lhok Village conduct fishing activities using hand line fishing gear. This study aims to determine the difference in the size of the fishing line on the catch and to determine the level of effectiveness. The research was conducted in June 2024 at Fish Landing Base (PPI) Lambada. The method used was experimental fishing, namely by conducting fishing operations directly using hooks with sizes 15, 16, and 17 mm. Data collection was carried out based on the catch of hand line landed at Lambada Fish Landing Base (PPI). The results showed that the difference in the size of the fishing line had a significant effect on the catch. Based on the results, it was determined that the 15 mm hook achieve the highest catch, totaling 90 tails with a combined weight of 34,3 kg. The most effective hook is with a size of 15 mm.
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Sanz, Crickette, Josep Call, and David Morgan. "Design complexity in termite-fishing tools of chimpanzees ( Pan troglodytes )." Biology Letters 5, no. 3 (2009): 293–96. http://dx.doi.org/10.1098/rsbl.2008.0786.
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Adopting the approach taken with New Caledonian crows ( Corvus moneduloides ), we present evidence of design complexity in one of the termite-fishing tools of chimpanzees ( Pan troglodytes ) in the Goualougo Triangle, Republic of Congo. Prior to termite fishing, chimpanzees applied a set of deliberate, distinguishable actions to modify herb stems to fashion a brush-tipped probe, which is different from the form of fishing tools used by chimpanzees in East and West Africa. This means that ‘brush-tipped fishing probes’, unlike ‘brush sticks’, are not a by-product of use but a deliberate design feature absent in other chimpanzee populations. The specialized modifications to prepare the tool for termite fishing, measures taken to repair non-functional brushes and appropriate orientation of the modified end suggest that these wild chimpanzees are attentive to tool modifications. We also conducted experimental trials that showed that a brush-tipped probe is more effective in gathering insects than an unmodified fishing probe. Based on these findings, we suggest that chimpanzees in the Congo Basin have developed an improved fishing probe design.
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Groom, Peter, Catriona Pickard, and Clive Bonsall. "Early Holocene Sea Fishing in Western Scotland: An Experimental Study." Journal of Island and Coastal Archaeology 14, no. 3 (2019): 426–50. http://dx.doi.org/10.1080/15564894.2018.1521481.
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Caamaño, Lucía Santiago, Roberto Galeazzi, Marcos Míguez González, Vicente Díaz Casás, and Ulrik D. Nielsen. "Experimental Validation of Transverse Stability Monitoring System for Fishing Vessels." IFAC-PapersOnLine 52, no. 21 (2019): 57–63. http://dx.doi.org/10.1016/j.ifacol.2019.12.283.
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Kuznecov, Mihail, Vladimir Polyanichko, and Vasiliy Shevtsov. "Hydroacoustic technologies for remote control of fish behavior and gentle removal of marine mammals from fishing gear." Fisheries 2023, no. 4 (2023): 80–88. http://dx.doi.org/10.37663/0131-6184-2023-4-80-88.
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The results of the development of hydroacoustic devices for the direction and retention of fish during their fishing and scaring of pinnipeds from fishing gear are presented. The devices allow generating underwater sounds that simulating the biological signals of predatory cetaceans. The characteristics of the sounds emitted and the methods of their application to increase the efficiency of fishing is shown. The results of experimental studies of the assessment of fish and pinnipeds reaction to the signals of hydroacoustic emitters - imitators of killer whales sounds are overviewed.
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Bachri, Samsul, I. Nyoman Suyasa, and Deni Achmad Soeboer. "Performance Test of Tuna Hand Fishing Line Hauler Tool by Using the Gear Ratio System Manually." Agrikan Jurnal Agribisnis Perikanan 16, no. 1 (2023): 235–45. http://dx.doi.org/10.52046/agrikan.v16i1.1479.
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Problems with the operation of the hand line are that the fishing line is often entangled, fishermen are tired from going up and down the line and the large size of the tuna fish requires extra effort. The aim of the study was to find out whether the line hauler tool can solve problems in the operation of tuna handlines. Research time September to November 2022 in Sorong City. Catch data collection was carried out during research activities, the research method used experimental fishing. Experimental fishing was carried out with 2 treatments, namely control fishing line and handline with a line hauler for 16 trips/day. Control handlines had a total catch of 161 individuals, while handlines with line haulers had a total catch of 196 individuals. The results of the t test show that the use of the line hauler has an effect on the number of fishing gear settings. The effectiveness of the assistive devices can be seen from the different houling times between control lures and handlines with assistive devices, this time difference affects the number of settings produced during fishing gear operation, where the use of assistive devices results in a total of 196 settings and without tools 161 times setting. So the use of tools provides opportunities to get more fish compared to without tools. The value of the effectiveness of the use of assistive devices is 18%.
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Machete, Miguel, Telmo Morato, and Gui Menezes. "Experimental fisheries for black scabbardfish (Aphanopus carbo) in the Azores, Northeast Atlantic." ICES Journal of Marine Science 68, no. 2 (2010): 302–8. http://dx.doi.org/10.1093/icesjms/fsq087.
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Abstract Machete, M., Morato, T., and Menezes, G. 2011. Experimental fisheries for black scabbardfish (Aphanopus carbo) in the Azores, Northeast Atlantic – ICES Journal of Marine Science, 68: 302–308. In this study, we used fisheries observers' data to analyse and describe the experimental fishing of black scabbardfish in the Azores in terms of type of gear, fishing operation, catch per unit effort (cpue), and fish size compositions. Standardized catch in numbers per 1000 hooks varied from 103 to 210 fish with an overall average of 132 fish per 1000 hooks. Recorded cpue values were similar to those recorded for Madeira and mainland Portugal in early 2000 but were higher than those observed in mainland Portugal for recent years. Bycatch was similar to that observed for other longline fisheries but much lower than in the North Atlantic deep-water trawl fishery. Fish size composition showed differences between locations in the Azores. Fish in Pico and São Jorge/Graciosa were consistently smaller than in other areas sampled and this may reflect the occurrence of an additional species, Aphanopus intermedius, in this area as proposed by gene analyses. Black scabbardfish (of possibly two species) may be considered an alternative resource for Azorean fisheries. Based on experience from other scabbardfish fisheries, however, it is suggested that fishing mortality should be maintained at a low level, traditional fishing methods should be encouraged, and bycatch should be closely monitored. Future studies of biology and distribution, stock assessments, and fisheries management advice should take into account the probable occurrence of two very similar species in the area. This study also highlights the importance of maintaining the fishery monitoring programme for the black scabbardfish fisheries in the Azores.
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Maselli, Valeria, Mariangela Norcia, Bruno Pinto, Emanuela Cirillo, Gianluca Polese, and Anna Di Cosmo. "Stress Induced by Fishing in Common Octopus (Octopus vulgaris) and Relative Impact on Its Use as an Experimental Model." Animals 15, no. 4 (2025): 503. https://doi.org/10.3390/ani15040503.
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The common octopus (Octopus vulgaris), among coleoid cephalopods, has evolved the most complex nervous system and sophisticated behaviors. Historically, O. vulgaris was a key animal model for neurophysiology research, and today, it is studied for its genomic innovations. However, unlike other models, there is no octopus farming for research, so specimens must be collected from the wild. This study assessed the impact of fishing on octopuses used in research, considering those caught using artisanal pots in the ‘Regno di Nettuno’ Marine Protected Area, Ischia (NA). To evaluate fishing stress, we identified morphological stress indicators such as chromatophore pattern and posture, and three potential molecular markers, estrogen receptor (ER), catalase (CAT), and heat shock protein (HSP70). We measured the percentage of stress signals shown by fished specimens and analyzed their differential gene expression. The transcriptional levels of octopuses caught using traps were compared to control specimens acclimated in captivity. Results indicated fluctuations in gene expression due to fishing stress. These findings suggest that an acclimation period after the stress event of fishing is crucial for ensuring the welfare of octopuses used in research, thus enhancing the quality of physiological and ethological studies.
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Jeong, Yeonju, and Namkyun Im. "Proposal of Restrictions on the Departure of Korea Small Fishing Vessel according to Wave Height." Journal of Marine Science and Engineering 11, no. 7 (2023): 1302. http://dx.doi.org/10.3390/jmse11071302.
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The Korean government imposes departure restrictions on fishing vessels of a gross tonnage of less than 15 tons under adverse weather conditions when significant wave heights exceed 3 m. However, an analysis of small fishing vessels indicates that frequent capsizing accidents occur even under the current departure restrictions of permission when significant wave heights are below 3 m. In this study, we propose new guidelines for regulating the departure of Korean small fishing vessels based on adverse weather conditions. To achieve this, we compare departure restrictions under weather deterioration for small fishing vessels in different countries worldwide with those in Korea. Additionally, by incorporating experimental research conducted in the United Kingdom on the capsizing of fishing vessels, we present a new departure restriction equation considering the ship characteristics (a narrow beam-to-length ratio) of Korean fishing vessels measuring 24 m or less. Through this analysis, we provide detailed guidelines for departure restrictions on Korean small fishing boats based on their length and wave height. To validate the proposed guidelines, we analyze fishing vessel capsizing accidents that occurred near the Korean coast over the past 23 years and demonstrate the utility of the new guidelines by applying them to past capsizing incidents.
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Aihartza, Joxerra, David Almenar, Egoitz Salsamendi, Urtzi Goiti, and Inazio Garin. "Fishing behaviour in the long-fingered bat Myotis capaccinii (Bonaparte, 1837): an experimental approach." Acta Chiropterologica 10, no. 2 (2008): 287–301. https://doi.org/10.5281/zenodo.13457712.
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(Uploaded by Plazi for the Bat Literature Project) To study the fishing behaviour of Myotis capaccinii, we performed an experiment in a flight tent containing an artificial pond. We recorded the behaviour of two groups of bats — eight individuals from two different roosts — using IR video camcorders and ultrasound detectors, and evaluated diet by analyzing faeces. Nightly, increasing amounts of fish were released in the pond. Our data show that M. capaccinii is able to exhibit fishing behaviour when fish occur in high densities in shallow waters, gaffing live fish from the water using their hind feet. They were attracted neither by dead fish floating, nor by ripples made by fishes feeding on the water surface. Bats showed a specific fishing behaviour with two main foraging patterns: A) long series of circular flights, skimming along the water and dipping in softly twice or three times in each roundabout; B) long figure-eight loops with bats flying faster and higher, swooping down on the centre of the pond, where they snapped their hind feet hard into the water. Compared with the echolocation calls used to catch insects from the water's surface in the wild, terminal buzzes were incomplete during the dips made to fish. Buzz II were always lacking, and buzz I had much longer inter-pulse intervals. This suggests that they were not pursuing specific targets but dipping randomly. We propose a scenario in which fishing behaviour occurs in the wild, linked to the seasonal drought of small ponds, marshes, or channels where large numbers of small fish become readily available and thus a profitable resource.
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Aihartza, Joxerra, David Almenar, Egoitz Salsamendi, Urtzi Goiti, and Inazio Garin. "Fishing behaviour in the long-fingered bat Myotis capaccinii (Bonaparte, 1837): an experimental approach." Acta Chiropterologica 10, no. 2 (2008): 287–301. https://doi.org/10.5281/zenodo.13520275.
Full textAbstract:
(Uploaded by Plazi for the Bat Literature Project) To study the fishing behaviour of Myotis capaccinii, we performed an experiment in a flight tent containing an artificial pond. We recorded the behaviour of two groups of bats — eight individuals from two different roosts — using IR video camcorders and ultrasound detectors, and evaluated diet by analyzing faeces. Nightly, increasing amounts of fish were released in the pond. Our data show that M. capaccinii is able to exhibit fishing behaviour when fish occur in high densities in shallow waters, gaffing live fish from the water using their hind feet. They were attracted neither by dead fish floating, nor by ripples made by fishes feeding on the water surface. Bats showed a specific fishing behaviour with two main foraging patterns: A) long series of circular flights, skimming along the water and dipping in softly twice or three times in each roundabout; B) long figure-eight loops with bats flying faster and higher, swooping down on the centre of the pond, where they snapped their hind feet hard into the water. Compared with the echolocation calls used to catch insects from the water's surface in the wild, terminal buzzes were incomplete during the dips made to fish. Buzz II were always lacking, and buzz I had much longer inter-pulse intervals. This suggests that they were not pursuing specific targets but dipping randomly. We propose a scenario in which fishing behaviour occurs in the wild, linked to the seasonal drought of small ponds, marshes, or channels where large numbers of small fish become readily available and thus a profitable resource.
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Aihartza, Joxerra, David Almenar, Egoitz Salsamendi, Urtzi Goiti, and Inazio Garin. "Fishing behaviour in the long-fingered bat Myotis capaccinii (Bonaparte, 1837): an experimental approach." Acta Chiropterologica 10, no. 2 (2008): 287–301. https://doi.org/10.5281/zenodo.13457712.
Full textAbstract:
(Uploaded by Plazi for the Bat Literature Project) To study the fishing behaviour of Myotis capaccinii, we performed an experiment in a flight tent containing an artificial pond. We recorded the behaviour of two groups of bats — eight individuals from two different roosts — using IR video camcorders and ultrasound detectors, and evaluated diet by analyzing faeces. Nightly, increasing amounts of fish were released in the pond. Our data show that M. capaccinii is able to exhibit fishing behaviour when fish occur in high densities in shallow waters, gaffing live fish from the water using their hind feet. They were attracted neither by dead fish floating, nor by ripples made by fishes feeding on the water surface. Bats showed a specific fishing behaviour with two main foraging patterns: A) long series of circular flights, skimming along the water and dipping in softly twice or three times in each roundabout; B) long figure-eight loops with bats flying faster and higher, swooping down on the centre of the pond, where they snapped their hind feet hard into the water. Compared with the echolocation calls used to catch insects from the water's surface in the wild, terminal buzzes were incomplete during the dips made to fish. Buzz II were always lacking, and buzz I had much longer inter-pulse intervals. This suggests that they were not pursuing specific targets but dipping randomly. We propose a scenario in which fishing behaviour occurs in the wild, linked to the seasonal drought of small ponds, marshes, or channels where large numbers of small fish become readily available and thus a profitable resource.
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Aihartza, Joxerra, David Almenar, Egoitz Salsamendi, Urtzi Goiti, and Inazio Garin. "Fishing behaviour in the long-fingered bat Myotis capaccinii (Bonaparte, 1837): an experimental approach." Acta Chiropterologica 10, no. 2 (2008): 287–301. https://doi.org/10.5281/zenodo.13520275.
Full textAbstract:
(Uploaded by Plazi for the Bat Literature Project) To study the fishing behaviour of Myotis capaccinii, we performed an experiment in a flight tent containing an artificial pond. We recorded the behaviour of two groups of bats — eight individuals from two different roosts — using IR video camcorders and ultrasound detectors, and evaluated diet by analyzing faeces. Nightly, increasing amounts of fish were released in the pond. Our data show that M. capaccinii is able to exhibit fishing behaviour when fish occur in high densities in shallow waters, gaffing live fish from the water using their hind feet. They were attracted neither by dead fish floating, nor by ripples made by fishes feeding on the water surface. Bats showed a specific fishing behaviour with two main foraging patterns: A) long series of circular flights, skimming along the water and dipping in softly twice or three times in each roundabout; B) long figure-eight loops with bats flying faster and higher, swooping down on the centre of the pond, where they snapped their hind feet hard into the water. Compared with the echolocation calls used to catch insects from the water's surface in the wild, terminal buzzes were incomplete during the dips made to fish. Buzz II were always lacking, and buzz I had much longer inter-pulse intervals. This suggests that they were not pursuing specific targets but dipping randomly. We propose a scenario in which fishing behaviour occurs in the wild, linked to the seasonal drought of small ponds, marshes, or channels where large numbers of small fish become readily available and thus a profitable resource.
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Hudson, Jean L. "Additional Evidence for Gourd Floats on Fishing Nets." American Antiquity 69, no. 3 (2004): 586–87. http://dx.doi.org/10.2307/4128409.
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Astafiev, S. E., V. A. Tatarnikov, I. G. Istomin, V. V. Akishin, and V. M. Volotov. "Features of pollock fishing technology." Trudy VNIRO 189 (December 9, 2022): 198–209. http://dx.doi.org/10.36038/2307-3497-2022-189-198-209.
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The purpose of the work is to study the features of specialized pollock fishing in the North Pacific Ocean.Identification of ways to increase the selectivity of specialized pollock fishing.Methods used: features of specialized pollock fishing in the North Pacific Ocean were investigated by analyzing regulatory documents governing fishing in Russia, the USA and Canada. The study of the selectivity of specialized pollock fishing and ways to increase it was carried out by analyzing the results of experimental work on the pollock fishing.Novelty: materials were obtained on the selectivity of specialized pollock fishing by Russian fishermen. Methods are proposed to increase selectivity of specialized pollock fishery.Result: non-compliance of trawl bag parameters with the requirements of fishing rules in the Far Eastern fishery basin for by-catch of fish of non-mental length was revealed.Practical significance: the obtained materials made it possible to assert that for the extraction (catch) of pollock in the North Pacific Ocean, which meets the requirements of fishing rules in the Far Eastern Fisheries Basin, there are a number of ways: an increase in the mesh size in a trawl bag to 120 mm or more, use in a trawl bag and with the landing of “T90,” use in a trawl bag flexible selective devices.
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Adou, Yedehi Euphrasie, Kassi Georges Blahoua, Souleymane Konate, Seydou Tiho, and Sébastien Barot. "Fish Fauna Production in the Bandama River at the Lamto Scientific Reserve (Côte d’Ivoire)." Haya: The Saudi Journal of Life Sciences 10, no. 04 (2025): 119–30. https://doi.org/10.36348/sjls.2025.v10i04.003.
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The increasing intensification of the exploitation of fishery resources in Africa in general and in Côte d'Ivoire in particular, associated with the processes of degradation of the natural environment, pose real risks of regression, disappearance of species and reduction of fish production. So, knowledge of fishing parameters is very important in the strategy implemented by managers of this sector on Ivorian rivers and bodies of water. Thus, the composition of catches, fishing effort and fishing gear production were studied in the Bandama River from July 2023 to June 2024. The data was collected by experimental fishing with gillnets and traps to which fishing data were added artisanal fishing carried out during the sampling days. A total of 41 species belonging to 5 orders and 13 families of fish with a biomass of 18896 kg were identified. Siluriformes (44%) and Perciformes (26%) were dominant. The highest fishing efforts and CPUEs were obtained with gillnets and papolo traps. The values were maximum in the rainy season. Annual production was 7285.74 Kg for the gillnets and 5066.53 Kg for the papolo traps. The results of this study revealed that fish from the Bandama River at Lamto are overexploited. This constitutes a basic element for decision-making in the quest for a protection and conservation strategy of the fishing resources of this protected area in Côte d’Ivoire.
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Aizpurua, Ostaizka, and Antton Alberdi. "Ecology and evolutionary biology of fishing bats." Mammal Review 48, no. 4 (2018): 284–97. https://doi.org/10.5281/zenodo.13507868.
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(Uploaded by Plazi for the Bat Literature Project) Abstract A few of the >1300 bat species recognised worldwide are known to consume fish to various extents. However, empirical information about how and how much different bat species capture and consume fish is limited and is probably distorted due to the biases introduced by occasional observations. In this review, we aim to synthesise the knowledge so far generated on fishing bats, in order to 1) assess the incidence of fishing in different bat species; 2) discuss the evolutionary framework and origins of fishing behaviour; and 3) identify the ecological challenges of fishing and review the state of knowledge about kinetic, morphological, sensory, behavioural, and physiological adaptations related to fishing. Fishing bats can be clustered into three groups based on the incidence of fish consumption. Noctilio leporinus is the only species in which fishing is widespread (occurring in most populations) and common (occurring most of the time and carried out by many individuals). Myotis vivesi , Myotis pilosus, and Myotis capaccinii comprise the second group, characterised by exhibiting regular fishing behaviour that is restricted to a limited number of populations. Noctilio albiventris , Myotis daubentonii, and Myotis macropus are classified in a third group, because although the occasional presence of fish traces in faeces has been reported, regular fishing behaviour in the wild has not been confirmed. Fishing was developed independently multiple times in different bat lineages, probably under different selective pressures and ecological scenarios. Nevertheless, all fishing species face similar challenges in terms of detecting, capturing, handling, and metabolising fish, which require specific kinetic, morphological, sensory, behavioural, and physiological adaptations. Both basic information about fishing behaviour in different species and specific knowledge of the biological adaptation are still missing. Thus, in this review we identify gaps in the knowledge and suggest experimental approaches to overcome them. ,
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Aizpurua, Ostaizka, and Antton Alberdi. "Ecology and evolutionary biology of fishing bats." Mammal Review 48, no. 4 (2018): 284–97. https://doi.org/10.5281/zenodo.13507868.
Full textAbstract:
(Uploaded by Plazi for the Bat Literature Project) Abstract A few of the >1300 bat species recognised worldwide are known to consume fish to various extents. However, empirical information about how and how much different bat species capture and consume fish is limited and is probably distorted due to the biases introduced by occasional observations. In this review, we aim to synthesise the knowledge so far generated on fishing bats, in order to 1) assess the incidence of fishing in different bat species; 2) discuss the evolutionary framework and origins of fishing behaviour; and 3) identify the ecological challenges of fishing and review the state of knowledge about kinetic, morphological, sensory, behavioural, and physiological adaptations related to fishing. Fishing bats can be clustered into three groups based on the incidence of fish consumption. Noctilio leporinus is the only species in which fishing is widespread (occurring in most populations) and common (occurring most of the time and carried out by many individuals). Myotis vivesi , Myotis pilosus, and Myotis capaccinii comprise the second group, characterised by exhibiting regular fishing behaviour that is restricted to a limited number of populations. Noctilio albiventris , Myotis daubentonii, and Myotis macropus are classified in a third group, because although the occasional presence of fish traces in faeces has been reported, regular fishing behaviour in the wild has not been confirmed. Fishing was developed independently multiple times in different bat lineages, probably under different selective pressures and ecological scenarios. Nevertheless, all fishing species face similar challenges in terms of detecting, capturing, handling, and metabolising fish, which require specific kinetic, morphological, sensory, behavioural, and physiological adaptations. Both basic information about fishing behaviour in different species and specific knowledge of the biological adaptation are still missing. Thus, in this review we identify gaps in the knowledge and suggest experimental approaches to overcome them. ,
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Mauliddin, Muhamad, Romie Jhonnerie, and Nofrizal Nofrizal. "Pengurangan Hasil Tangkapan Pada Alat Tangkap Togok dengan Menggunakan BRD (Bycatch Reduction Device) Tipe Rope BRD di Kuala Tungkal, Provinsi Jambi." Dinamika Lingkungan Indonesia 9, no. 2 (2022): 113. http://dx.doi.org/10.31258/dli.9.2.p.113-117.
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Togok is a fishing gear in the form of a conical net body whose arms are on two poles and the success of catching it relies on currents, togok fishing gear is used to catch Rebon shrimp (Acetes japonicas) but in its operation, many catches are found bycatch. The high bycatch will have an impact on capture sustainable fisheries, one of the efforts to reduce bycatch is by using BRD (Bycatch Reduction Devices), the use of BRD has been widely carried out on trawl fishing gear but on togok fishing gear, it has never been done. This study aimed for knowing the reduction in catches of main catch, bycatch, and discard the togok fishing gear that has been installed with rope BRD and knows the reduction in catches of shrimp and fish species. This study uses experimental fishing, namely by carrying out direct fishing operations with local fishermen for 20 days of catch. The reduction of togok catch using BRD type rope BRD in the main catch is 8.4%, in bycatch is 11.8% and discard is 17, 1% and the reduction in catch of shrimp species ranged from 8,4% - 13,5% and reduction in catch of fish species ranged from 10,9% - 22,6%.
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Tangke, Umar, and Ahmad Talib. "Study of the Condition of Mackerel Scad Stocks (Decapterus sp) in Ternate Island Waters." Agrikan Jurnal Agribisnis Perikanan 16, no. 1 (2023): 192–98. http://dx.doi.org/10.52046/agrikan.v16i1.1567.
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Mackerl scad, is an economically important small pelagic fish species in the waters of Ternate Island which is exploited by fishermen with various types of active fishing gear such as purse seine, bagan and gill net. The use of fishing gear that is less selective with fishing activities throughout the year and not equipped with utilization regulations, is expected to cause pressure on skipjack stocks in the waters of Ternate Island. . This research is a type of empirical research carried out using the experimental fishing method, in which the researcher participates in fishing activities for 120 trips and samples of the fish caught are taken for the measurement process in the Lab. Processing of Fishery Products for 5 months, from October 2022 to March 2023. The results showed that the condition of the flyfish population parameter in Ternate Island waters was relatively stable with a maximum length value of 33.49 cm, a growth coefficient of 0.99 per month, fishing mortality 0.42, natural mortality 1.71 , the exploitation rate is 0.2 and the SPR is 42% and the recruitment value is Y/R 1.9% and B/R 56.8%. Where from these results indicate the need for an increase in fishing effort until the exploitation value reaches 0.4 for optimal and sustainable management.
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Jenkins, Gregory P. "The ecosystem effects of abalone fishing: a review." Marine and Freshwater Research 55, no. 6 (2004): 545. http://dx.doi.org/10.1071/mf04046.
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Although abalone fishing involves less damage to the habitat compared with other fishing methods, such as trawling and dredging and there are no problems of bycatch or discards, there are a number of issues relating to impact on the ecosystem. These issues include mechanical damage from anchors, catch bags and hoses, manipulation of predators and competitors by fishermen, and translocation of marine pests. The trophic impact of the removal of abalone would not be expected to be great, any impact may relate more to competition for space, for example, abalone may out-compete sea urchins for space when food is abundant. Therefore, the sea urchin population may be an ecological indicator of the impacts on the ecosystem of removing abalone. The data on the ecological impacts of abalone fishing are insufficient, and there have not been any direct experiments on the effects of varying abalone abundance on other ecosystem components. Recent studies on marine protected areas (MPAs) indicate that the ecological effects of fishing in reef systems may have had unexpected consequences. Abalone fishing offers a rare opportunity to trace the ecological effects of fishing, and to this end, a possible experimental framework is outlined.
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Eiselt, B. Sunday. "Mass Harvesting, Ichthyofaunal Assemblages, and Ancestral Paiute Fishing in the North American Great Basin." American Antiquity 85, no. 4 (2020): 715–36. http://dx.doi.org/10.1017/aaq.2020.37.
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Documenting variability in the archaeological record is critical to our understanding human fishing adaptations in the North American Great Basin over time. Unfortunately, in the absence of robust middle range techniques for interpreting fishbone assemblages, many studies have been limited in their capacity to engage in theoretical discussions of the role of fishing in forager subsistence regimes. The Northern Paiute in Oregon and Nevada exploited seasonally aggregated tui chub (Siphateles bicolor) through mass-harvesting techniques using nets and baskets. This article integrates experimental studies with ethnographic and archaeological data to infer the types of fishing gear that were used from the reconstructed sizes of tui chub remains. The mean size of fish assemblages is compared to the coefficient of variation to identify fishing techniques based on the size parameters of gear types, and a technology investment model is used to assess regional variations in commitments to fishing in open lake and marshland settings. Results are compared to tui chub assemblages from two protohistoric archaeological sites in eastern Oregon, revealing two distinctive fishing strategies with general implications for the organization of labor by hunter-gatherer fisherfolk.
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Takasan, Kazuki, and Masaaki Iiyama. "Improving fishing ground estimation with weak supervision and meta-learning." PLOS ONE 20, no. 4 (2025): e0321116. https://doi.org/10.1371/journal.pone.0321116.
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Estimating fishing grounds is an important task in the fishing industry. This study modeled the fisher’s decision-making process based on sea surface temperature patterns as a pattern recognition task. We used a deep learning-based keypoint detector to estimate fishing ground locations from these patterns. However, training the model required catch data for annotation, the amount of which was limited. To address this, we proposed a training strategy that combines weak supervision and meta-learning to estimate fishing grounds. Weak supervision involves using partially annotated or noisy data, where the labels are incomplete or imprecise. In our case, catch data cover only a subset of fishing grounds, and trajectory data, which are readily available and larger in volume than catch data, provide imprecise representations of fishing grounds. Meta-learning helps the model adapt to the noise by refining its learning rate during training. Our approach involved pre-training with trajectory data and fine-tuning with catch data, with a meta-learner further mitigating label noise during pre-training. Experimental results showed that our method improved the F1-score by 64% compared to the baseline using only catch data, demonstrating the effectiveness of pre-training and meta-learning.
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Park, Dong-Woo. "An experimental study on the resistance performance of fishing vessel appendages." Journal of the Korean Society of Marine Engineering 42, no. 9 (2018): 668–74. http://dx.doi.org/10.5916/jkosme.2018.42.9.668.
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Pichot, Géraldine, Grégory Germain, and Daniel Priour. "On the experimental study of the flow around a fishing net." European Journal of Mechanics - B/Fluids 28, no. 1 (2009): 103–16. http://dx.doi.org/10.1016/j.euromechflu.2008.02.002.
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Oyuela, S., R. Sosa, A. D. Otero, F. P. Arribas, and H. R. Diaz-Ojeda. "An experimental and numerical hydrodynamic study on the Argentinian fishing vessels." IOP Conference Series: Materials Science and Engineering 1288, no. 1 (2023): 012047. http://dx.doi.org/10.1088/1757-899x/1288/1/012047.
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Abstract The purpose of this work is the validation of the hydrodynamic resistance for a small fishing vessel providing more details about the ship’s hydrodynamics. The selected ship is a traditional vessel that has been sailing in Argentina for more than 20 years without a previous numerical resistance evaluation. Because of the absence of previous numerical optimization, the ship might be a non-efficient vessel from a consumption, operating and polluting point of view. For this reason, in order to bring a more detailed evaluation of the flow around this hull, numerical studies are carried out with the open source OpenFOAM code and validated with experimental results obtained at the University of Buenos Aires towing tank. Reynolds Averaged Navier Stokes (RANS) method together with volume of fluid (VOF) are used for the numerical procedure. Once the resistance results are validated, the total resistance coefficient is split into viscous and wave coefficients in order to provide insight into ship hydrodynamics. Pressure distributions on the hull and wave patterns will be also presented for different ship loading conditions, focusing on the flow around the hull that might give information for a future hull optimization.
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Ibnu Gustiron, Gilang Rusrita Aida, M Tajuddin Noor, and Yusrudin Yusrudin. "Pengaruh Perbedaan Warna Lampu pada Hasil Tangkapan Ikan Teri (Stolephorus Sp) pada Alat Tangkap Bagan Perahu di Perairan Karangantu Serang Banten." Manfish: Jurnal Ilmiah Perikanan dan Peternakan 2, no. 2 (2024): 224–31. http://dx.doi.org/10.62951/manfish.v2i2.73.
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Boat lift net is a fishing tool that operates at night. This tool has the aim of getting catches in large quantities by using light aids from lamps. This research aims to investigate the effect of different colors of lights on the catch of anchovies (Stolephorus sp) on boat fishing gear in the waters of Karantu Serang, Banten. The experimental fishing method will be used with two different colored lights, namely green and white. Anchovy catch data will be collected and analyzed to evaluate whether there are significant differences in the number of anchovy catches caught in the two different light colors. It is hoped that the results of this research will provide a better understanding of the influence of different colors of lights on the catch of anchovies (Stolephorus sp) on boat fishing gear in the Karangantu waters of Serang, Banten.
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Aminah, Siti, Aulia Azhar Wahab, Sudirman S, and Nisa Hartini. "Fishing Activities and Catch Diversity in the Swamp Waters of Bangkau Village, Hulu Sungai Selatan Regency." IOP Conference Series: Earth and Environmental Science 1468, no. 1 (2025): 012002. https://doi.org/10.1088/1755-1315/1468/1/012002.
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Abstract Bangkau Village is one of the swamp areas with significant potential as a fish producer in South Kalimantan. This study aimed to identify the types of fishing gear used during the rainy season, determine the composition and proportion of the catches, and analyze the diversity, uniformity, and dominance indices. The experimental fishing method involved testing fishing operations using the fishing gear found in Bangkau Village, with sampling conducted at each location three times, one week apart. The results revealed that the fishing gear used included tempirai kawat, hancau, lalangit, pangilar, and sesuduk. Ten fish species were caught, with the following proportions: Trichopodus trichopterus 4.38%, Trichogaster pectoralis 28.19%, Helostoma temminckii 1.77%, Anabas testudineus 13.75%, Belontia hasselti 0.90%, Channa lucius 0.009%, Betta picta 1.17%, Dermogenys megarrhamphus 0.23%, Clarias batrachus 2.03%, and Monopterus albus 2.52%. The diversity index was 1.07, which falls under the medium category, the uniformity index was 0.47, indicating a small population with depressed communities, and the dominance index was 0.5, signifying unstable community dominance, meaning certain species dominated others.
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., Yusrizal, Muhamad Rama Safari, Aman Saputra, R. M. Tonny Kusumo Efyjanto, Abdul Basith, and Heri Triyono. "Capture Area Compatibility with Map of Fishery Potential Area Based on Chlorophyl-a and Sea Surface Temperature in Aru Sea Waters-Indonesia." Asian Journal of Fisheries and Aquatic Research 21, no. 4 (2023): 1–12. http://dx.doi.org/10.9734/ajfar/2023/v21i4544.
Full textAbstract:
The Republic of Indonesia's Fisheries Management Area (Wilayah Pengelolaan Perikanan Negara Republik Indonesia) marine waters is an area with high capture fisheries potential, reaching 20% of the national fish potential. Fishing is often hampered by the lack of information related to Fishing Potential Zones, resulting in reduced efficiency. The solution offered is to utilize geographic information systems (GIS) or remote sensing with aqua MODIS satellite images of chlorophyll-a and sea surface temperature as data for mapping potential fishing zones. The objectives of this research are to understand the operation of purse seines, analyze the influence of sea surface temperature and chlorophyll-a on purse seine catches, and determine the level of suitability of fishing areas with maps of potential fishing zones. To answer the objective, non-experimental based applied research was conducted with a case study approach, survey method and correlation approach to determine the effect of chlorophyll-a and sea surface temperature variables on catches. The tools used hardware, namely laptops and computers with the software needed research are SEADAS, SAGA, QGIS, Ms. Excel and SPSS. Data on the distribution of and chlorophyll-a used in the study are data from Aqua MODIS level 1x1 kilometer resolution downloaded on the page https://oceancolor.gsfc.nasa.gov/.
 As for the results of statistical testing, there is an influence of chlorophyll-a and sea surface temperature simultaneously and partially on the catch by giving an influence of 73.6%. With the distribution of chlorophyll-a concentration and sea surface temperature in the KM fishing area. The level of conformity of fishing areas with maps of potential fishing zones on fishing trips from December 2020 to April 2021 reached a percentage of conformity of 55.93% with a total catch of 209,360 Kg, indicating the selection of fishing areas by conventional skippers on KM XXX compared to the forecast of fishing areas using aqua MODIS satellite imagery remote sensing technology can be categorized as good even though it only relies on experience and information about fishing areas from other vessels.