Journal articles on the topic 'Tuna purse-seine fisheries'
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Baihaqi, Mahiswara, and T. W. Budiarti. "Characteristics of purse seine fisheries in the Sulawesi Sea (case study in Tumumpa fishing port)." IOP Conference Series: Earth and Environmental Science 919, no. 1 (November 1, 2021): 012016. http://dx.doi.org/10.1088/1755-1315/919/1/012016.
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Abstract The purse seine is the dominant fishing gear operating at the Tumumpa Fishing Port with a vessel of >90%. The purse seines that have developed are large pelagic targets, with the main catch targets being skipjack, mackerel tuna, and tuna. Tuna, mackerel tuna and skipjack are important commodities for fisheries in Indonesia. This study aims to determine the characteristics of purse seine fishing gear and its catch in the Sulawesi Sea. Data collection was carried out for two years from 2019-2020 at Tumumpa Fishery Port. Indications for the use of fish resources are calculated by comparing the length-at-first-capture (Lc) with the length-at-first-mature (Lm). The results showed that purse seines are very dominant in exploiting large pelagic resources (skipjack, mackerel tuna and tuna) with the proportion reaching 78%, small pelagic (21% scads and 1% other fish). The large pelagic fishing season using the purse seine vessel occurs in May – November, with 2 peak seasons in July and September. While the small pelagic occurs in May – September, with the peak occurring in July. The size when the frigate tuna was first caught was at a fork length of 25.15 cm (Lc) and Lm in a size of 28.52 cm for females and 28.29 cm for males. Meanwhile, the first scads was caught (Lc) at a length of 21.4 cm with the length-at-first-mature (Lm) being 20 cm for the female and 19 cm for the male. Based on this analysis, it was shown that the purse seines is a selective fishing gear for small pelagic fish but not selective for large pelagic fish.
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Nova Elasari, Asri Sawiji, and Toha Muslih. "The fisheries productivity of purse seine in TPI Kranji Paciran, Lamongan." Journal of Marine Resources and Coastal Management 2, no. 2 (August 30, 2021): 18–21. http://dx.doi.org/10.29080/mrcm.v2i2.1157.
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Fisheries productivity plays an important role in national development. The potential of fisheries in Indonesia is quite large so that many coastal communities depend on their lives from fishing activities. East Java province has a fishery area that is quite potential with the availability of considerable human resources, one of them is Lamongan. This research was conducted in Fish Auction Site (Tempat Pelelangan Ikan, TPI) Kranji, Lamongan. The purpose of this study is to find out the productivity value of purse seine fisheries in TPI Kranji based on the size of the ship and the fishing trip. This research was conducted by survey method to know the condition of purse seine fishery in the field directly. Purse seine fishing vessels located in TPI Kranji in 2020 as many as 32 ships that have gross tonnage (GT) of 9 to 24 GT. The dominant catches are Longtail Tuna (Thunnus tonggol), Mackerel Tuna (Euthynnus affinis), Fringescale Sardinella (Sardinella fimbriata), Short Mackerel (Rastrelliger brachysoma) and Goldstripe Sardinella (Sardinella gibbosa). There are two seasons in the fishing process at TPI Kranji, the regular season (Fringescale Sardinella) and the peak season (Tuna). The highest value of productivity per trip was obtained 1.59 tons / trip / year which occurred in 2019 with 223 of fishing trips and the amount of catch production of 356.71 tons. The highest value of productivity per GT occurred in 2020, obtained 2.09 tons / GT / year, which currently has 32 purse seine vessels. The productivity per GT from year to year is increasing because the amount of production is also increasing every year.
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Poisson, François, Francisco Abascal Crespo, Jim R. Ellis, Pierre Chavance, Pascal Bach, Miguel N. Santos, Bernard Séret, et al. "Technical mitigation measures for sharks and rays in fisheries for tuna and tuna-like species: turning possibility into reality." Aquatic Living Resources 29, no. 4 (October 2016): 402. http://dx.doi.org/10.1051/alr/2016030.
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Tuna fisheries have been identified as one of the major threats to populations of other marine vertebrates, including sea turtles, sharks, seabirds and marine mammals. The development of technical mitigation measures (MM) in fisheries is part of the code of conduct for responsible fisheries. An in-depth analysis of the available literature regarding bycatch mitigation in tuna fisheries with special reference to elasmobranchs was undertaken. Studies highlighting promising MMs were reviewed for four tuna fisheries (longline, purse seine, driftnets and gillnet, and rod and line – including recreational fisheries). The advantages and disadvantages of different MMs are discussed and assessed based on current scientific knowledge. Current management measures for sharks and rays in tuna Regional Fishery Management Organizations (t-RFMOs) are presented. A review of relevant studies examining at-vessel and postrelease mortality of elasmobranch bycatch is provided. This review aims to help fisheries managers identify pragmatic solutions to reduce mortality on pelagic elasmobranchs (and other higher vertebrates) whilst minimizing impacts on catches of target tuna species. Recent research efforts have identified several effective MMs that, if endorsed by t-RFMOs, could reduce elasmobranchs mortality rate in international tropical purse seine tuna fisheries. In the case of longline fisheries, the number of operational effective MMs is very limited. Fisheries deploying driftnets in pelagic ecosystems are suspected to have a high elasmobranchs bycatch and their discard survival is uncertain, but no effective MMs have been field validated for these fisheries. The precautionary bans of such gear by the EU and by some t-RFMOs seem therefore appropriate. Recreational tuna fisheries should be accompanied by science-based support to reduce potential negative impacts on shark populations. Priorities for research and management are identified and discussed.
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Yusfiandayani, Roza, Mulyono S. Baskoro, William Sutioso, and Ibrahim Kholilullah. "Fishing trials of portable fad on purse seine fisheries." IOP Conference Series: Earth and Environmental Science 1033, no. 1 (June 1, 2022): 012020. http://dx.doi.org/10.1088/1755-1315/1033/1/012020.
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Abstract Fish Aggregating Devices (FADs) are tools for collecting fish by using various attractors from solid objects that attract fish to gather. Portable FAD uses sound frequency attractors that can be operated in various fishing areas. Portable FAD is not placed permanently in the waters and can be stored until fishing operations are carried out. The purpose of this activity is to calculate the buoyancy and gravity of portable FAD, determine the composition of the catch, and determine the distribution pattern of fish in the morning, afternoon, and evening. For 17 (seventeen) days, this activity was carried out in Yamdena waters, Ambon. The calculation results of the total buoyancy force of portable FAD were 20554.69 gs, total sinking force was 5460.69 gs, and the extra buoyancy value was 73%. The dominant fish caught using purse seiner were skipjack tuna (Katsuwonus pelamis) of 37.41%, yellowfin tuna (Thunnus albacares) of 33.53%, scad fish (Decapterus russeli) of 11.62%, tuna (Euthynnus affinis) by 8.12%, and sunglir fish (Elagatis bipinnulata) by 5.14%. Portable FAD can attract fish from 15 minutes and continue to increase to a peak at 105 minutes with 160 fish approaching. The highest fish approach to portable FAD was recorded in the morning at 105 minutes at a depth of 20-25 m were 89 fish, the lowest was in the afternoon at 15 minutes at a depth of 5-10 m were 7 fish. The best use of portable FAD is in the morning and evening.
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Bez, Nicolas, Emily Walker, Daniel Gaertner, Jacques Rivoirard, and Philippe Gaspar. "Fishing activity of tuna purse seiners estimated from vessel monitoring system (VMS) data." Canadian Journal of Fisheries and Aquatic Sciences 68, no. 11 (November 2011): 1998–2010. http://dx.doi.org/10.1139/f2011-114.
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In the lack of fishery-independent information, catch per unit of effort (CPUE) is the conventional abundance index. In the case of the tropical tuna purse seine fisheries, a critical difficulty lies in the definition of an effective fishing effort, because fishermen use two different fishing modes (free swimming schools versus schools under fish aggregating devices) alternatively during the same trip. In this study, vessel monitoring system (VMS) data were used in an operational level to study and quantify the spatial dynamic of the tropical tuna purse seine fishing activity. A Bayesian state–space model allowed classifying VMS steps into three activities (fishing, tracking, and cruising), which were characterized by a small set of complementary spatial indicators. The dominant activity (49%) was clearly the tracking of tuna schools within areas of aggregations. A hierarchical spatial organization of the three fishing activities was also evidenced. Fishing strategies described by the triplets of proportions of time devoted to each activity and interpreted as compositional data were modelled by the sum of a vessel effect and a seasonal effect.
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Silooy, Frentje D., Agustinus Tupamahu, O. T. S. Ongkers, and D. D. P. Matrutty. "Analysis Financial Fisheries Business of Mackerel Scad (Decapterus macarellus) in the Southern Waters of Ambon Island." Agrikan: Jurnal Agribisnis Perikanan 13, no. 2 (December 3, 2020): 175. http://dx.doi.org/10.29239/j.agrikan.13.2.175-181.
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This study aims 1) to determine the technical aspects of fishing with a mini purse seine; 2) to analyze the feasibility of a mini purse seine fishery business in the southern part of Ambon Island. This research was carried out from January to December 2018 in several fish landing sites scattered in the southern part of Ambon Island waters, namely Nusaniwe, Hutumuri and Lehari Villages. Sampling was by purposive sampling. Primary and secondary data were taken. Data were analyzed using descriptive analysis and business financial analysis. The dimensions of the mini purse seine vessels are 20-22.5 m long, 2.70-3.85 m wide, and 1.5-1.8 m high, the dimensions of the net are 225- 345 m long, 50-70.5 m high. The composition of the catch consisted of 4 types of fish, namely blue fly (59.8%), tuna (18.4%), skipjack (17.7%), and baby tuna (4.1%). The results showed that the mini purse seine fishery business met the requirements and was still feasible to develop. The results of the calculation of the business feasibility of a positive NPV and greater than zero (NPV> 0) of Rp. 933,471,927, an IRR of 15.8% greater than the interest rate (10.5%), the value of B / C> 1 of 1.18, the criteria for ROI of 20.14%, the value of PI (Profitability Index)> 1.
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Danckwerts, D. K., C. D. McQuaid, A. Jaeger, G. K. McGregor, R. Dwight, M. Le Corre, and S. Jaquemet. "Biomass consumption by breeding seabirds in the western Indian Ocean: indirect interactions with fisheries and implications for management." ICES Journal of Marine Science 71, no. 9 (June 6, 2014): 2589–98. http://dx.doi.org/10.1093/icesjms/fsu093.
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Abstract Fisheries potentially affect seabirds both directly and indirectly. Well-documented direct effects have resulted in significant losses to seabird populations, but indirect effects are less well known. One way in which tropical seabirds may be indirectly affected is through overexploitation of large subsurface predators. Tropical seabirds must forage over wide areas to attain sufficient prey and have evolved various methods of increasing foraging efficiency. One strategy is their association with surface-feeding tunas. When feeding, these predators drive prey to the surface, making them available to seabirds feeding from above. Losses in predator biomass will reduce prey accessibility (but not necessarily prey abundance) for seabirds, contributing to declines in bird populations. To explore indirect fisheries effects, we compared estimates of the magnitude and spatial distributions of consumption by breeding seabirds with fisheries offtake in the western Indian Ocean (WIO). Data from the literature were compared with Indian Ocean Tuna Commission longline and purse seine landings of selected tuna and billfish species from between 2000 and 2009. Breeding seabird populations (adults and immature birds) were estimated at ∼19 million individuals, assuming 50% breeding success. Based on the literature, these birds will consume between 150 000 and 500 000 metric tonnes (t) of prey; values that are of the same magnitude as mean annual longline (904±632 t) and purse seine (349 861±61 820 t) landings for the region. Spatial overlap between fisheries and seabirds is high, especially around the Seychelles, suggesting that the indirect impacts of fisheries on seabird populations may be great. Sooty Tern (Onychoprion fuscatus) is by far the dominant seabird in the study area, accounting for over 80% of numbers and consumption estimates. Our results highlight the importance of seabirds within WIO marine trophic webs and emphasize the potential indirect effects of industrial tuna fisheries on their populations.
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Snouck-Hurgronje, Julia E., David M. Kaplan, Emmanuel Chassot, Alexandra Maufroy, and Daniel Gaertner. "Fishing on floating objects (FOBs): how French tropical tuna purse seiners split fishing effort between GPS-monitored and unmonitored FOBs." Canadian Journal of Fisheries and Aquatic Sciences 75, no. 11 (November 2018): 1849–58. http://dx.doi.org/10.1139/cjfas-2017-0152.
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Fishing on floating objects (FOBs) dominates catch in tropical tuna purse seine fisheries. One frequently cited advantage of deploying GPS-monitored FOBs is that the position information can be used for directed fishing to reduce search time for tuna. However, purse seiners also fish on foreign objects for which position information is not available. It is critical to quantify the prevalence of fishing on GPS-monitored versus unmonitored FOBs to understand how they impact fishing effort and catch per unit effort. We analyzed French commercial, observer, and FOB trajectory data in the Atlantic and Indian oceans to determine how often purse seine vessels fish on GPS-monitored FOBs. Only 2.7%–20.4% of French FOB fishing sets over 2007–2013 in both oceans were made on GPS-monitored FOBs. Though increasing over time, the low percentage suggests that French vessels do not primarily use GPS-monitored FOBs to reduce search time for tuna. We hypothesize that fishery-wide FOB deployments have important collective consequences for overall fishing effort and recommend that future effort metrics should be based on fishery-wide FOB activities.
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Hartaty, Hety, Budi Nugraha, and Bram Styadji. "PERIKANAN PUKAT CINCIN TUNA SKALA KECILYANG BERBASIS DI PELABUHAN PERIKANAN PANTAI (PPP) TAMPERAN (Small Scale Tuna Purseseine Fisheries Based in Tamperan Fishing Port)." Marine Fisheries : Journal of Marine Fisheries Technology and Management 3, no. 2 (September 27, 2016): 161. http://dx.doi.org/10.29244/jmf.3.2.161-167.
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<p>ABSTRACT<br />In general, fisheries in Indonesia is still dominated by small-scale fisheries, one of themis the purse seine fishery based in Tamperan Fishing Port. This study aims to determine aspects of purse seine fishery based on Tamperan Fishing Port such as vessel size and fishing gear, FADs , fishing ground and catches. The study was conducted in 2012 in Tamperan Fishing Port with measurement methods and direct observation and interviews with owners, skippers and crew. The results showed that the vessel of small-scale tuna purse seine fishing based in Tamperan Fishing Port have tonnage between 28-45 GT and made of wood with length 17.21-28 m, width 6-7 m, and depth 2-3 m. Nets is used have length between 250-300 m and width 8-10 m. Fishing ground is FADs at coordinates 10º-12º S and 100º-110º E, 60-100 miles from the Pacitan Bay with distance to the location of FADs about one day. The catch is dominated by skipjack about 57.27%, followed by scad26.31% and juvenile yellowfin 10.05%.</p><p><br />Keywords: Purse seine, small scale tuna fisheries, Tamperan</p><p>-------</p><p>ABSTRAK</p><p>Secara umum, perikanan tangkap di Indonesia masih didominasi oleh usaha perikanan skala kecil, salah satunya adalah nelayan pukat cincin yang berbasis di PPP Tamperan. Penelitian ini bertujuan untuk mengetahui aspek penangkapan perikanan pukat cincin yang berbasis di PPP Tamperan berupa ukuran kapal dan alat tangkap, rumpon, daerah penangkapan dan hasil tangkapan. Penelitian dilakukan pada tahun 2011 di PPP Tamperan Pacitan dengan metode pengukuran dan pengamatan langsung di lapangan serta wawancara dengan nelayan pemilik, nakhoda dan awak kapal. Hasil penelitian menunjukkan bahwa armada pukat cincin perikanan tuna skala kecil yang berbasis di PPP Tamperan memiliki ukuran tonase antara 28-45 GT dan terbuat dari kayu dengan ukuran panjang antara 17,21-28 m, lebar 6-7 m, dan dalam 2-3 m. Jaring yang digunakan memiliki panjang antara 250-300 m dan lebar 8-10 m dengan menggunakan rumpon. Daerah penangkapan berada pada koordinat 10º-12º LS dan 100º-110º BT dan berjarak sekitar 60-100 mil dari Teluk Pacitan dengan lama perjalanan menuju lokasi rumpon sekitar 1 hari. Hasil tangkapan didominasi oleh cakalang sebesar 57,27%, diikuti oleh layang 26,31% dan yuwana madidihang 10,05%.</p><p><br />Kata kunci: Pukat cincin, perikanan tuna skala kecil, Tamperan</p>
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Swimmer, Y., EA Zollett, and A. Gutierrez. "Bycatch mitigation of protected and threatened species in tuna purse seine and longline fisheries." Endangered Species Research 43 (December 17, 2020): 517–42. http://dx.doi.org/10.3354/esr01069.
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Bycatch and mortality in fishing gear poses a conservation threat worldwide to many marine species. Resource managers and conservation scientists face challenges in identifying bycatch mitigation solutions that work for multiple taxa while maintaining acceptable levels of target fish catch. The most successful mitigation measures to address bycatch concerns are those that (1) minimize bycatch with limited or no impact on target species catch, (2) have been proven through at-sea experimental research, (3) are practical, affordable, and easy to use, and (4) do not risk the safety of the fishing vessel crew or the bycaught animals. We conducted a review of mitigation measures in fishing gears that target tuna and tuna-like species and that either prevent capture of non-target species in fishing gear or facilitate alive post-capture release, and evaluated these against 4 defined criteria: effective, proven, practical, and safe. This paper outlines the most effective bycatch mitigation measures, as based upon the best scientific information available, in commercial and artisanal pelagic longline and purse seine fisheries, specifically those that target tuna and tuna-like species. This review includes information on gear and operational changes to fishing practices that reduce bycatch for protected and threatened species across taxonomic groups, with a focus on cetaceans, sea turtles, seabirds, sharks, and istiophorid billfishes. The information provided can guide future research and management efforts in Regional Fisheries Management Organizations that are specific to tuna fishing and that aim to minimize impacts to protected and threatened species while maintaining viable commercial fisheries.
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Martinez-Rincon, Raul O., Sofia Ortega-Garcia, Juan G. Vaca-Rodriguez, and Shane P. Griffiths. "Development of habitat prediction models to reduce by-catch of sailfish (Istiophorus platypterus) within the purse-seine fishery in the eastern Pacific Ocean." Marine and Freshwater Research 66, no. 7 (2015): 644. http://dx.doi.org/10.1071/mf14062.
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Sailfish (Istiophorus platypterus) is an important apex predator in neritic and oceanic pelagic ecosystems. The species is also a primary target of important catch-and-release sport fisheries that the support local economies of developing countries. However, commercial purse-seine fisheries that target tuna in the eastern Pacific Ocean (EPO) incidentally catch and discard large numbers of sailfish. Sailfish by-catch data recorded by scientific observers in the Mexican tuna purse-seine fleet in the EPO from 1998 to 2007 was used in generalised additive models (GAMs) to predict environmental and spatial preferences of sailfish. GAM predicted the highest sailfish catches to occur in coastal waters during El Niño events during late autumn and winter, with sea surface temperatures >26°C, with negative values of deviation in sea surface height (<–10cm), and low chlorophyll-a (<0.25mgm–3). GAM predicted that the catch probability for sailfish increased 1.8-fold during El Niño events in coastal waters and 1.5-fold under La Niña. However, the spatial distribution of sailfish remained largely unchanged during El Niño and La Niña events. Our models may be an additional fisheries management tool that may be used to support temporary spatial-temporal throughout the fishing season to reduce sailfish by-catch in the EPO.
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Batty, Michael, and Vivian Fernandes. "Management of Tuna Fisheries for Sustainable Development in the Pacific Islands." Asia-Pacific Journal of Ocean Law and Policy 3, no. 2 (November 1, 2018): 176–209. http://dx.doi.org/10.1163/24519391-00302003.
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Cooperation by Pacific Island countries in the management of tuna fisheries is an important means of achieving sustainable development of these shared resources, in line with Sustainable Development Goal 14. The Western and Central Pacific Ocean (WCPO) tuna fishery is the largest tuna fishery in the world and two examples of arrangements based on regional cooperation are provided: • The purse seine Vessel Day Scheme (VDS) is a fisheries management system that is being implemented through the cooperation of the Parties to the Nauru Agreement (PNA), which regulates harvesting of tuna in line with SDG 14.4. The scheme also establishes rights in the shared fishery for small island developing states, increasing economic returns in support of SDG 14.7. • Regional cooperation in fisheries Monitoring Control and Surveillance is a unique collaboration between the members of the Forum Fisheries Agency (FFA) to address illegal, unreported and unregistered (IUU) fishing in support of SDG 14.4. A range of regionally agreed systems and tools is applied.
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Forget, Fabien G., Manuela Capello, John D. Filmalter, Rodney Govinden, Marc Soria, Paul D. Cowley, and Laurent Dagorn. "Behaviour and vulnerability of target and non-target species at drifting fish aggregating devices (FADs) in the tropical tuna purse seine fishery determined by acoustic telemetry." Canadian Journal of Fisheries and Aquatic Sciences 72, no. 9 (September 2015): 1398–405. http://dx.doi.org/10.1139/cjfas-2014-0458.
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Characterizing the vulnerability of both target and non-target (bycatch) species to a fishing gear is a key step towards an ecosystem-based fisheries management approach. This study addresses this issue for the tropical tuna purse seine fishery that uses fish aggregating devices (FADs). We used passive acoustic telemetry to characterize, on a 24 h scale, the associative patterns and the vertical distribution of skipjack (Katsuwonus pelamis), yellowfin (Thunnus albacares), and bigeye tuna (Thunnus obesus) (target species), as well as silky shark (Carcharhinus falciformis), oceanic triggerfish (Canthidermis maculata), and rainbow runner (Elagatis bipinnulata) (major non-target species). Distinct diel associative patterns were observed; the tunas and the silky sharks were more closely associated with FADs during daytime, while the rainbow runner and the oceanic triggerfish were more closely associated during the night. Minor changes in bycatch to catch ratio of rainbow runner and oceanic triggerfish could possibly be achieved by fishing at FADs after sunrise. However, as silky sharks display a similar associative pattern as tunas, no specific change in fishing time could mitigate the vulnerability of this more sensitive species. For the vertical distribution, there was no particular time of the day when any species occurred beyond the depth of a typical purse seine net. While this study does not provide an immediate solution to reduce the bycatch to catch ratios of the FAD-based fishery in the western Indian Ocean, the method described here could be applied to other regions where similar fisheries exist so as to evaluate potential solutions to reducing fishing mortality of non-target species.
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Amandè, Monin J., Emmanuel Chassot, Pierre Chavance, Hilario Murua, Alicia Delgado de Molina, and Nicolas Bez. "Precision in bycatch estimates: the case of tuna purse-seine fisheries in the Indian Ocean." ICES Journal of Marine Science 69, no. 8 (June 15, 2012): 1501–10. http://dx.doi.org/10.1093/icesjms/fss106.
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Abstract Amandè, M. J., Chassot, E., Chavance, P., Murua, H., Delgado de Molina, A., and Bez, N. 2012. Precision in bycatch estimates: the case of tuna purse-seine fisheries in the Indian Ocean. – ICES Journal of Marine Science, 69: . Estimating bycatch, i.e. the incidental catch of non-target marine animals and undersized individuals of target species, by raising observer data to the whole fishery is routine practice. The annual bycatch of the European tropical tuna purse-seine fishery over the period 2003–2009 was estimated at 11 590 t [95% confidence interval: (8165–15 818 t)], corresponding to 4.7% of the tuna landings. An analysis of the variability in the precision of this estimate, based on generalized linear models and Monte Carlo simulations, showed that the current sampling coverage of the tropical tuna fishery observer programme, which is 4.6% of the fishing trips, resulted in large uncertainties in bycatch estimates by species, i.e. none of the estimates have a relative root mean square error smaller than 50%. Although the overall magnitude of bycatch of the fishery appeared to be small, the current sampling coverage was insufficient to give any reliable estimate for low-occurring species, such as marine turtles, some oceanic pelagic sharks, and some billfishes. Increasing the sampling coverage would likely improve bycatch estimates. Simulation outputs were produced to help define (i) trade-offs between the priority species to be monitored, (ii) the estimation precision, (iii) expected accuracy, and (iv) the associated sampling costs.
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Forget, Fabien, Jeff Muir, Melanie Hutchinson, David Itano, Igor Sancristobal, Bruno Leroy, John Filmalter, et al. "Quantifying the accuracy of shark bycatch estimations in tuna purse seine fisheries." Ocean & Coastal Management 210 (September 2021): 105637. http://dx.doi.org/10.1016/j.ocecoaman.2021.105637.
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Setyadji, Bram, and Umi Chodriyah. "Fishing Season of Large Tuna from Purse Seine Fishery in Tumumpa, Manado, North Sulawesi." ILMU KELAUTAN: Indonesian Journal of Marine Sciences 23, no. 4 (January 4, 2019): 171. http://dx.doi.org/10.14710/ik.ijms.23.4.171-178.
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Knowledge on seasonal fishing pattern is essential in fisheries research in order to increase the effectiveness of fishing and at the same time protecting the fishing ground from excessive fishing practices. Determining the seasonal fishing pattern of large pelagic fishes, namely large tuna (yellowfin and bigeye), small tuna (mackerel) and skipjack tuna were the objective of this study. Data from the 2013-2015 fishing operation time series were used to analyze the fishing season using the percentage average per unit effort (CPUE) method. The main focus of this study was purse seine fishery. The research showed that high fishing season of large pelagic fishes allegedly occurred during May to July, which reached its peak on May. On the other hand, low fishing season occurred during January to April, with the lowest on March. There were similarities between large tuna, small tuna and skipjack in term of their seasonal fishing pattern, although they did not show any good correlation (r<0.5). This might due to fact that even tough large tuna, small tuna and skipjack tuna shared the same ecological niche but apparently, they did not show any interaction (symbiosis) but competition.
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Wibawa, Teja A., Patrick Lehodey, and Inna Senina. "Standardization of a geo-referenced fishing data set for the Indian Ocean bigeye tuna, <i>Thunnus obesus</i> (1952–2014)." Earth System Science Data 9, no. 1 (February 28, 2017): 163–79. http://dx.doi.org/10.5194/essd-9-163-2017.
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Abstract. Geo-referenced catch and fishing effort data of the bigeye tuna fisheries in the Indian Ocean over 1952–2014 were analyzed and standardized to facilitate population dynamics modeling studies. During this 62-year historical period of exploitation, many changes occurred both in the fishing techniques and the monitoring of activity. This study includes a series of processing steps used for standardization of spatial resolution, conversion and standardization of catch and effort units, raising of geo-referenced catch into nominal catch level, screening and correction of outliers, and detection of major catchability changes over long time series of fishing data, i.e., the Japanese longline fleet operating in the tropical Indian Ocean. A total of 30 fisheries were finally determined from longline, purse seine and other-gears data sets, from which 10 longline and 4 purse seine fisheries represented 96 % of the whole historical geo-referenced catch. Nevertheless, one-third of total nominal catch is still not included due to a total lack of geo-referenced information and would need to be processed separately, accordingly to the requirements of the study. The geo-referenced records of catch, fishing effort and associated length frequency samples of all fisheries are available at doi:10.1594/PANGAEA.864154.
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Karakulak, F. Saadet, Taner Yıldız, and Burcu Bilgin Topçu. "Turkish bluefin tuna purse seine fleet from 1987 to 2012 and fisheries management." Ege Journal of Fisheries and Aquatic Sciences 29, no. 4 (September 5, 2013): 187–92. http://dx.doi.org/10.12714/egejfas.2012.29.4.07.
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Mannocci, Laura, Fabien Forget, Mariana Travassos Tolotti, Pascal Bach, Nicolas Bez, Hervé Demarcq, David Kaplan, et al. "Predicting bycatch hotspots in tropical tuna purse seine fisheries at the basin scale." Global Ecology and Conservation 24 (December 2020): e01393. http://dx.doi.org/10.1016/j.gecco.2020.e01393.
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Nugroho, Duto, and Suherman Banon Atmaja. "KEBIJAKAN RUMPONISASI PERIKANAN PUKAT CINCIN INDONESIA YANG BEROPERASI DI PERAIRAN LAUT LEPAS." Jurnal Kebijakan Perikanan Indonesia 5, no. 2 (November 30, 2013): 97. http://dx.doi.org/10.15578/jkpi.5.2.2013.97-106.
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<p>Penggunaan rumpon laut-dalam telah mengubah taktik dan strategi perikanan pukat cincin pelagis kecil yang beroperasi di perairan dangkal untuk bergeser pada perikanan tuna neritik tropis. Rumponisasi perikanan pukat cincin yang dirancang untuk meningkatkan produktivitas telah menjadi masalah serius pada perikanan neritik tuna. Hal ini terjadi karena tertangkapnya ikan berukuran kecil dalam jumlah yang dominan sehingga dalam jangka panjang akan berpotensi konflik dengan perikanan lainnya. Para ilmuwan yang tergabung dalam pengelolaan perikanan regional merekomendasikan bahwa pengembangan terkendali terhadap penggunaan rumpon di daerah asuhan juvenile tuna tropis. Pengendalian dalam jangka panjang dapat meminimalkan ancaman bagi kelangsungan hidup kelompok jenis tuna. Hal ini terkait dengan pentingnya memperbesar peluang masuknya sediaan kelompok jenis ini pada tingkat yang layak untuk dimanfaatkan. Di Indonesia, pilihan kebijakan perikanan tangkap baik melalui peralihan sasaran kelompok spesies maupun diversifikasi usaha penangkapan akan selalu bertumpu pada pertimbangan sosial. Bagaimanapun juga, proses mengubah pemahaman nelayan nelalui pengendalian jumlah dan teknologi kapal penangkap ikan serta penutupan sementara daerah penangkapan yang akan melalui proses panjang harus tetap dijalankan untuk mencegah runtuhnya perikanan yang saat ini sedang berjalan.</p><p>The use of Fish Aggregating Devices (FADs) has radically changing the tactic and strategy shallow waters small pelagic purse seiner into high seas tropical neritics tuna fisheries. Applying FADs on purse seine fishery which initiated to increase its productivity became a serious problem to neritics<br />tuna fishery. This indicated by the negative impact on neritics and tropical tuna populations due to large number of small size of tunas being caught and uncertain of number and of FADS position in the high seas. In the long run it will generate a potential conflict to other existing fisheries. The member scientists of regional fisheries management organization (RFMO) recommends that the development of the use of FADs, especially in the area which dominated of juvenile of tropical tuna, should be strongly regulated. FADs management through control system should be applied to minimize impact on recruitment process that associated with the importance of long term availability of its fisheries. Management option through shifting target species and diversification of the fishing activities in<br />Indonesia would always be rely on social dimension. Nevertheles, reorientation on fishers understanding on controllable number of fishing vessels and its technological creeps should strongly be implemented to avoid collapse their existing fisheries.</p>
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Escalle, Lauriane, Daniel Gaertner, Pierre Chavance, Alicia Delgado de Molina, Javier Ariz, and Bastien Mérigot. "Forecasted consequences of simulated FAD moratoria in the Atlantic and Indian Oceans on catches and bycatches." ICES Journal of Marine Science 74, no. 3 (December 13, 2016): 780–92. http://dx.doi.org/10.1093/icesjms/fsw187.
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Given the increasingly extensive use of drifting fish aggregation devices (FADs) by the purse-seine fisheries targeting tropical tunas, fishing effort restrictions have been introduced to manage tropical tuna stocks. However, these measures are focused on the protection of juvenile tunas and do not take account of the potential impact on bycatch or associated megafauna (whales and whale sharks). An iterative “fishing-day” Monte Carlo simulation model was developed to investigate the consequences on tropical tunas and bycatch of introducing extensive area 6-month moratoria on FAD activities. The model allowed for variability in a range of plausible values of the parameters characterizing the fishing operations conducted by European purse-seiners in the eastern tropical Atlantic and western Indian Oceans for the period 2005–2014. Monte Carlo simulations, using probabilities based on these fishery data, were carried out for the French and Spanish fishing fleets separately to account for differences in fishing strategies. The models predicted a decrease in FAD sets and an increase in free school sets. As a consequence, the catch of small tuna (<10 kg) decreased while the catch of large tuna (≥10 kg) increased, leading to an overall increase in tuna catch of 100–200 tons/year/vessel in the Atlantic Ocean, and a decrease of 400–1500 tons/year/vessel in the Indian Ocean. The bycatch decreased in the Indian Ocean, while in the Atlantic Ocean billfishes, turtles and chondrichthyans bycatch increased slightly and other bony fishes decreased. Because fishing practices were modified, whale and whale shark associated sets increased slightly in the Indian Ocean.
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Alcover, Maria. "United States – Measures Concerning the Importation, Marketing and Sale of Tuna and Tuna Products (US–Tuna II (Mexico) (Recourse to Article 21.5 of the DSU by the United States / Second Recourse to Article 21.5 of the DSU by Mexico), DS381." World Trade Review 19, no. 3 (July 2020): 469–71. http://dx.doi.org/10.1017/s1474745620000178.
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These compliance proceedings concern a second revised measure adopted by the United States regarding the labelling of dolphin-safe tuna products (the 2016 Tuna Measure). The 2016 Tuna Measure places three types of conditions on the use of the dolphin-safe label: (i) conditions relating to the automatic disqualification of certain tuna products (eligibility criteria); (ii) conditions relating to certifications (certification requirements); and (iii) conditions relating to record keeping and segregation of dolphin-safe and non-dolphin-safe tuna (tracking and verification requirements). Regarding the eligibility criteria, tuna harvested using large-scale driftnets on the high seas and tuna products containing tuna harvested by setting on dolphins anywhere in the world are automatically disqualified for the dolphin-safe label. Regarding the certification and tracking/verification requirements, the 2016 Tuna Measure makes a distinction between the Eastern Tropical Pacific Ocean (ETP) large purse seine fishery, on the one hand, and all other fisheries, on the other hand.
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Natsir, Mohamad, Agustinus Anung Widodo, Wudianto Wudianto, and Sveinn Agnarsson. "TECHNICAL EFICIENCY OF FISH AGGREGATING DEVICES ASSOCIATED WITH TUNA FISHERY IN KENDARI FISHING PORT – INDONESIA." Indonesian Fisheries Research Journal 23, no. 2 (February 12, 2018): 97. http://dx.doi.org/10.15578/ifrj.23.2.2017.97-105.
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Kendari fishing port is one of the biggest tuna fisheries landing in Indonesia. It yearly average tuna production was more than 20 thousand tons. The tuna fishing fleet in Kendari use FAD (Fish Aggregating Devices) as an auxiliary fishing gear. FAD management is major issues in Indonesian tuna fisheries. extensive investment on FAD has led to increase of the juvenile and by catch and also social problem because of the competition. Technical efficiency analysis was done during this study, 2015 catch and logistic data from Kendari fishing port was run using stochastic frontier to obtain the model. Mean value technical efficiency was 0.534. Purse seine the highest mean value compared to other fishing gear. All the variables input show positive relationship to the catch except the days at sea variables, this is a signal that the increasing number of FAD has made the fisherman spend more time at sea it will decrease the technical efficiency. The results support the need of FAD regulation done by the government of Indonesia. Regulation will keep the number of FAD at optimum level and increase the technical effieciency so the fisheries keep gaining the optimum benefit from the resources.
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Moreno, Gala, Laurent Dagorn, Gorka Sancho, and David Itano. "Fish behaviour from fishers’ knowledge: the case study of tropical tuna around drifting fish aggregating devices (DFADs)." Canadian Journal of Fisheries and Aquatic Sciences 64, no. 11 (November 1, 2007): 1517–28. http://dx.doi.org/10.1139/f07-113.
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Purse-seining for tropical tuna is one of the most technologically advanced fisheries in the world. The purpose of this study was to apply local ecological knowledge (LEK) to assist in the planning of future in situ studies of fish behaviour around drifting fish aggregating devices (DFADs) by prioritizing research topics, thereby reducing the number of potential hypotheses to explore. Interviews of fishing masters of the purse-seine fleets working in the western Indian Ocean provided an alternate, independent, and previously unexplored source of behavioural information, specifically on the attraction, retention, and departure behaviours of tuna schools in relation to DFADs. Most fishing masters agreed that the maximum attraction distance of a DFAD is approximately 10 km and generally agreed to the following statements. Tuna form distinct schools under FADs, commonly segregated by species and size. The main reasons for the departure of tuna aggregations from FADs are changes in currents or FAD movements and location in relation to physical or oceanographic features. The number of actively monitored DFADs at sea in the western Indian Ocean was estimated at approximately 2100. Incorporating fishers into the planning and design stages of future research projects will facilitate collaborative and integrated approaches.
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Jamal, Muhammad, Ernaningsih Ernaningsih, and Nadiarti Nadiarti. "KARAKTERISTIK BIOLOGIS IKAN TONGKOL (Euthynnus affnis) HASIL TANGKAPAN PURSE SEINE DI PERAIRAN HERLANG TELUK BONE, INDONESIA." Marine Fisheries : Journal of Marine Fisheries Technology and Management 13, no. 1 (August 25, 2022): 113–22. http://dx.doi.org/10.29244/jmf.v13i1.37825.
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Purse seine fishing gear is designed to catch both large and small pelagic fish, and commonly used in tuna fisheries. However, this gear is not size-selective, and can pose a threat to fish stocks. The aim of this study was to obtain information on the biological characteristics of little tuna (Euthynnus affinis) caught by purse seiners operating in the waters of Herlang District in Bulukumba Regency, South Sulawesi, Indonesia. Data collected from March to May 2019 included little tuna fork length (FL), weight, sex, and gonad maturity stage (GMS). Fish characteristics analysed in this study were length-weight relationship, size distribution, life phase, and gonadal maturity. Analyses were performed in MS Excel 2010 and Graphpad Prism v.5.03. Male and female little tuna had isometric growth patterns. Modal length class was 24.0-24.4 cm for males and 23.0-23.4 cm for females. All fish caught were below 30 cm TL, while the mean size at first maturity for this species is 39.8 cm. Although the catch was dominated by immature fish (GMS I and GMS II), all GMS stages were present for both sexes, with around a third of females in GMS III-V.
Keywords: Scombridae, gonad maturity stage, length-weight relationship, early maturation, fishing pressure.
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Tidd, Alex N., Chris Reid, Graham M. Pilling, and Shelton J. Harley. "Estimating productivity, technical and efficiency changes in the Western Pacific purse-seine fleets." ICES Journal of Marine Science 73, no. 4 (January 20, 2016): 1226–34. http://dx.doi.org/10.1093/icesjms/fsv262.
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Abstract The purse-seine tuna fleet in the Western Pacific Ocean has undergone an accelerated expansion since the 1980s. The fishery is primarily managed using fishing effort limits. Constraining effort to ensure the biological health of the stock, while enhancing economic benefits generated by the fishery, is a major challenge faced by fisheries managers in this region. To maintain effort levels that achieve those objectives, there is a need to take into account technical and efficiency changes over time that influence the productivity of fleets. This study evaluates how the productivity of four of the region's purse-seine fleets has changed year on year between 1993 and 2010 using a robust bootstrapped Malmquist index approach. This index is separated into: technical change, which represents the change in productivity due to the introduction of new technology and efficiency change, the change in productivity resulting from a change in the level of efficiency in the use of inputs. The results show that half of the 56 purse-seine vessels examined displayed significant gains in productivity, which appeared to be driven primarily by technical change. The technical efficiency of fleets showed less marked changes, potentially due to the practical inability to maximize performance in the face of dramatic technological advances.
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Dagorn, Laurent, John D. Filmalter, Fabien Forget, Monin Justin Amandè, Martin A. Hall, Peter Williams, Hilario Murua, Javier Ariz, Pierre Chavance, and Nicolas Bez. "Targeting bigger schools can reduce ecosystem impacts of fisheries." Canadian Journal of Fisheries and Aquatic Sciences 69, no. 9 (September 2012): 1463–67. http://dx.doi.org/10.1139/f2012-089.
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Sustainability of living resource exploitation relies on an ecosystem management approach. Within tropical tuna purse seine fisheries using fish aggregating devices (FADs), such an approach incorporates the reduction of bycatch, in particular vulnerable species such as elasmobranchs. The levels of total bycatch (in mass) from fishing operations using FADs is known to be five times higher than when tuna are caught in free-swimming schools. We intend to find practical solutions to reduce bycatch in FAD sets through the investigation of the relationships between the ratio of bycatch to target catch across different set size classes in all oceans. Ratios were always highest when catches were small, with the smallest class of catches responsible for the highest total portion of bycatch (23%–43%) while only contributing negligibly to the total target catch (3%–10%). Reducing the number of fishing sets (a part of the total effort) while maintaining the same total yield could contribute to a substantial reduction in the impacts of human activities.
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Nataniel, Anildo, Jon Lopez, and Maria Soto. "Modelling seasonal environmental preferences of tropical tuna purse seine fisheries in the Mozambique Channel." Fisheries Research 243 (November 2021): 106073. http://dx.doi.org/10.1016/j.fishres.2021.106073.
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Kaplan, David M., Emmanuel Chassot, Justin M. Amandé, Sibylle Dueri, Hervé Demarcq, Laurent Dagorn, and Alain Fonteneau. "Spatial management of Indian Ocean tropical tuna fisheries: potential and perspectives." ICES Journal of Marine Science 71, no. 7 (February 13, 2014): 1728–49. http://dx.doi.org/10.1093/icesjms/fst233.
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Abstract Effective use of spatial management in the pelagic realm presents special challenges due to high fish and fisher mobility, limited knowledge and significant governance challenges. The tropical Indian Ocean provides an ideal case study for testing our ability to apply existing data sources to assessing impacts of spatial management on tuna fisheries because of several recent controversial spatial closures. We review the scientific underpinnings of pelagic MPA effects, spatio-temporal patterns of Indian Ocean tuna catch, bycatch and fish movements, and the consequences of these for the efficacy of spatial management for Indian Ocean tropical tuna fisheries. The tropical Indian Ocean is characterized by strong environmental fluctuations, regular seasonal variability in catch, large observed tuna displacement distances, relatively uniform catch-per-unit-effort and bycatch rates over space, and high fisher mobility, all of which suggest significant variability and movement in tropical tuna fisheries that are simply not well adapted to static spatial closures. One possible exception to this overall conclusion would be a large time/area closure east of Somalia. If closed for a significant fraction of the year it could reduce purse-seine bycatch and juvenile tuna catch. Dynamic closures following fish migratory patterns are possible, but more focused information on fish movements will be needed for effective implementation. Fortunately, several recent improvements in conventional fishery management and reporting will likely enhance our ability to evaluate spatial and non-spatial management options in the near future, particularly as pertaining to bycatch species.
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Arifin, Muhammad Z., Emil Reppie, and Johnny Budiman. "The analysis of capture fisheries performance in Lembeh Island, Bitung City, North Sulawesi." AQUATIC SCIENCE & MANAGEMENT 5, no. 2 (July 27, 2019): 42. http://dx.doi.org/10.35800/jasm.5.2.2017.24569.
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Title (Bahasa Indonesia): Analisis keragaan perikanan tangkap Pulau Lembeh, Kota Bitung, Sulawesi UtaraAccording to the statistics of 2014 Bitung City, fisheries production value of the city increased. This needs to be analyzed in order to establish whether the development provides economic benefit to the society and whether the fishing activities are efficient. The objectives of the study were to study the capture fisheries performance and its impact on the responsible fisheries management in Lembeh (as part of the Bitung City); to know the efficiency level of the fishing activities carried out by fishermen of Lembeh; and to analyze the economic benefit of the capture fisheries to the fishermen. The data were analyzed using descriptive methods. Results found that dominant fishing gears used by Lembeh fishermen were handlines(multihooks-handline, octopus handline, squid handline, and tuna handline), nets (beach seineand gill net), mini purse seine, and fish aggregating device (such as light boat). Those fishing gears were distributed in all villages of Lembeh. Efficient fishing activities are those with efficiency value of 1. From 111 fishermen respondents in Lembeh, 29 of them did efficient fishing operations. The range of investment needed for each fishing gear varied among different types. Mean fishermen’s exchange rate of Lembeh island was 1.29, meaning that there was positive impact of fishing activities on the fulfillment of family’s daily needs.Menurut data statistik Kota Bitung dalam angka tahun 2014, nilai produksi perikanan Kota Bitung mengalami kenaikan. Kenaikan ini perlu di analisis apakah memberi manfaat secara ekonomi kepada masyarakat dan apakah penangkapannya sudah efisien. Tujuan penelitian ini adalah 1) menganalisis keragaan perikanan tangkap dan dampaknya pada pengelolaan perikanan yang bertanggung jawab di Pulau Lembeh (yang merupakan bagian dari Kota Bitung), 2) menetapkan tingkat efisiensi kegiatan perikanan tangkap yang telah dilakukan oleh nelayan di Pulau Lembeh, dan 3) menganalisa manfaat kegiatan perikanan tangkap secara ekonomi bagi para nelayan. Analisis data menggunakan metode deskriptif. Hasil penelitian menujukkan, bahwa alat tangkap yang dominan dioperasikan oleh nelayan Pulau Lembeh adalah jenis handline(pancing noru, pancing, pancing gurita, pancing cumi, pancing tuna), soma (beach seinedan gillnet), mini purse seine(pajeko), dan pengumpul ikan (perahu lampu). Alat tangkap tersebut tersebar di seluruh kelurahan di Pulau Lembeh. Kegiatan penangkapan yang efisien adalah kegiatan penangkapan dengan nilai efisiensi 1. Dari 111 responden nelayan pulau Lembeh, 29 di antaranya melakukan operasi penangkapan yang efisien. Kebutuhan modal usaha masing-masing alat tangkap berbeda antara satu dan lainnya. Rata-rata Nilai Tukar Nelayan (NTN) di pulau tersebut adalah 1,29 di mana menunjukkan adanya dampak positif kegiatan penangkapan ikan dalam pemenuhan kebutuhan sehari hari.
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Sulistyaningsih, Ririk Kartika, Irwan Jatmiko, and Maya Agustina. "CPUE STANDARDIZATION OF FRIGATE TUNA (Auxis thazard) CAUGHT BY PURSE SEINE OFF THE COAST OF WESTERN SUMATERA (FMA 572)." Indonesian Fisheries Research Journal 26, no. 1 (April 11, 2020): 11. http://dx.doi.org/10.15578/ifrj.26.1.2020.11-17.
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Frigate tuna (Auxis thazard) is one of the major commercial tuna species, both in industrial and small scale fisheries, particularly in the waters off Western Sumatera. In Indonesia, A. thazard is a group of locally called “tongkol” together with A. rochei, Thunnus tonggol, and Euthynnus affinis. This study describes a preliminary examination of frigate tuna catch from purse seine off the coast of western Sumatera (FMA 572). The data were collected daily by an enumerator on the fish landing site from 2013 to 2017, including fishing gear, number of days at sea, catch, length, and weight of frigate tuna. The fishing ground coordinate data provided by the observer on board the vessel. General Linear Model (GLM) with gamma was applied in this study to standardize the CPUE by year, quarter, season, and GT as fixed variables. The results showed that the variation of CPUE was mostly influenced by year and quarter, while season and fleet size (GT) showed less impact on the catch. In general, even though the catch trend declines during the observation years, the population of frigate tuna off the coast of western Sumatera (FMA 572) were considered sustainable.
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Hsu, Tung-Yao, Yi Chang, Ming-An Lee, Ren-Fen Wu, and Shih-Chun Hsiao. "Predicting Skipjack Tuna Fishing Grounds in the Western and Central Pacific Ocean Based on High-Spatial-Temporal-Resolution Satellite Data." Remote Sensing 13, no. 5 (February 25, 2021): 861. http://dx.doi.org/10.3390/rs13050861.
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Skipjack tuna are the most abundant commercial species in Taiwan’s pelagic purse seine fisheries. However, the rapidly changing marine environment increases the challenge of locating target fish in the vast ocean. The aim of this study was to identify the potential fishing grounds of skipjack tuna in the Western and Central Pacific Ocean (WCPO). The fishing grounds of skipjack tuna were simulated using the habitat suitability index (HSI) on the basis of global fishing activities and remote sensing data from 2012 to 2015. The selected environmental factors included sea surface temperature and front, sea surface height, sea surface salinity, mixed layer depth, chlorophyll a concentration, and finite-size Lyapunov exponents. The final input factors were selected according to their percentage contribution to the total efforts. Overall, 68.3% of global datasets and 35.7% of Taiwanese logbooks’ fishing spots were recorded within 5 km of suitable habitat in the daily field. Moreover, 94.9% and 79.6% of global and Taiwan data, respectively, were identified within 50 km of suitable habitat. Our results showed that the model performed well in fitting daily forecast and actual fishing position data. Further, results from this study could benefit habitat monitoring and contribute to managing sustainable fisheries for skipjack tuna by providing wide spatial coverage information on habitat variation.
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Amri, Khairul, Afrisa Novalina, and Bram Setyadji. "SOME BIOLOGICAL STOCK INDICATORS OF BULLET TUNA (Auxis rochei, Risso 1810) FROM BANDA SEA AND ITS ADJACENT WATERS." Indonesian Fisheries Research Journal 25, no. 2 (October 11, 2019): 103. http://dx.doi.org/10.15578/ifrj.25.2.2019.103-112.
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Bullet tuna is considered as one of the important species for tuna purse seine fisheries in Indonesia, especially in archipelagic waters. However, little is known about its biological characteristics which proven to be pivotal in stock assessment. The purpose of this research was to determine some of the biological stock indicators for bullet tuna (Auxis rochei) from Banda Sea and its adjacent waters. The study was conducted from February to November 2016. The length of the bullet tuna caught were in between 18.5-32.7 cmFL (mode=24 cmFL). Growth pattern was isometric with b=3.01 and R2=0.84 Sex ratio was balanced between male and female (1:1). The spawning season allegedly from June to November. The length at 50% mature (L50) was 23.6 cmFL. A good indicator for the fisheries, where at least 75% of the mature fish caught were already spawned. The asymptotic length (L) was 33.63 cmFL, with coefficient of growth (K) around 0.73/year. Natural mortality (M) estimated at 1.87/year, fishing mortality (F) estimated at 2.20/year and total mortality (Z) was 4.07/year. The exploitation level (E) was estimated to be at maximum level (E=0.54/year), for precautionary purpose, the number of efforts should be reduced down to 8% from current effort.
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Setyadji, Bram, and Raymon Rahmanov Zedta. "Stock Health Bioindicator of Skipjack Tuna, Katsuwonus pelamis (Linnaeus, 1758) From Purse Seine Fishery in Western Part of Sumatra." Omni-Akuatika 18, S1 (June 25, 2022): 26. http://dx.doi.org/10.20884/1.oa.2022.18.1.895.
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The study focused on stock health bioindicator of skipjack tuna (i.e., size structure, length-weight relationship, and length-at-first-capture/Lc), which can be used as a reference for species-specific stock assessment in the western part of Sumatra waters. All size data were acquired from Kutaraja, Aceh, and Sibolga, North Sumatra, as part of the enumeration program, courtesy of the Research Institute for Tuna Fisheries, from January 2016 to December 2020. The result showed that the skipjack stock’s health is heading in an unsustainable direction. Further management actions are imminent to prevent any stock from declining shortly.Keywords: length-weight relationship, growth pattern, catch-at-size
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Dreyfus-Leon, Michel J., and Elena Solana-Arellano. "Comparative analysis of incidental dolphin mortality, during fishing trips of the Mexican purse seine tuna fishery in the Eastern Pacific Ocean recorded by two scientific observer programs." Revista de Biología Marina y Oceanografía 54, no. 3 (January 17, 2020): 350. http://dx.doi.org/10.22370/rbmo.2019.54.3.2032.
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Scientific observer programs in fisheries are being deployed worldwide in order to obtain robust data for fishery studies, and in relation to its interaction with target and bycatch species. A comparison between two observer programs in Mexican purse seine tuna fishery in the Eastern Pacific ocean is performed considering the incidental mortality per trip as a metric recorded by both observers programs from 1999 to 2016. A Bayesian t-test approximation was used for the comparison between the two methods since, due to its probabilistic nature reduces uncertainty. The analysis showed a very low probability of differences for the estimated bycatch rate between both programs.
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Widodo, Agustinus Anung, Ralph Thomas Mahulette, and Fayakun Satria. "STATUS STOK, EKSPLOITASI DAN OPSI PENGELOLAAN SUMBERDAYA IKAN TUNA DI LAUT BANDA." Jurnal Kebijakan Perikanan Indonesia 7, no. 1 (May 1, 2015): 45. http://dx.doi.org/10.15578/jkpi.7.1.2015.45-54.
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<p>Laut Banda merupakan salah satu daerah penangkapan tuna yang potensial di Indonesia, Jenis alat tangkap yang digunakan terdiri dari pukat cincin, huhate, rawai tuna, pancing ulur dan pancing tonda. Hasil tangkapan tuna di Laut Banda meliputi cakalang, madidihang dan tuna mata besar. Sumberdaya tuna di Laut Banda diduga masih merupakan sub stok sumberdaya tuna di perairan Pasifik Tengah dan Barat. Hasil kajian stok tuna oleh Western and Central Pacific Fisheries Commission (WCPFC) pada 2012 melaporkan bahwa stok cakalang dan madidihang tidak mengalami overfishing dan overfished, sedangkan tuna mata besar telah mengalami overfishing dan overfished. Hasil penelitian Pusat Penelitian Pengelolaan Perikanan dan Konservasi Sumber Daya Ikan (P4KSI) pada 2012 menunjukkan madidihang dan tuna mata besar tertangkap pukat cincin, huhate serta kombinasi pancing ulur permukaan dan pancing tonda pada stadium yuwana, dengan indikasi nilai Lc<Lm. Jumlah yuwana madidihang dan tuna mata besar yang tertangkap pukat cincin masing-masing mencapai sekitar 7,9 ton (26%) dan 1,5 ton (5%) dari rerata total hasil tangkapan sekitar 30,29 ton/kapal/trip. Jumlah yuwana madidihang dan tuna mata besar yang tertangkap huhate sekitar 0,71 ton (15%) dan 0,23 ton (5%) dari rerata total tangkapan sekitar 4,79 ton/kapal /trip. Jumlah yuwana madidihang dan tuna mata besar yang tertangkap pancing ulurpancing tonda sekitar 17% dan 2% dari rerata total tangkapan sebesar 0,31 ton/kapal/trip. Saat ini hasil tangkapan tuna yang berasal dari pukat cincin tidak dikehendaki pasar ekspor, mereka lebih memilih tuna hasil tangkapan huhate ataupun jenis pancing lainnya. Oleh karena itu salah satu kebijakan pengelolaan perikanan tuna di Laut Banda adalah tidak mengembangkan alat tangkap pukat cincin, adapun huhate, pancing ulur-pancing tonda masih tetap dapat dioperasikan.</p><p> </p><p>Banda sea is one of potential tuna fishing grounds among others in Indonesia. Various fishing gear types were operatedin this fishing ground such as pole & line (PL), tuna long line (LL), hand line (HL) and troll line (TR). Skipjack (SKJ), yellowfin tuna (YFT) and bigeye tuna (BET) are main species caught in Banda sea and currently assumed as one stock in the Western Central Pacific Ocean (WCPO). Recent stock assessment done by WCPFC in 2012 reported that BET is in overfishing state (F>Fmsy) while YFT and SKJ are not in overfishing or overfished state. It was also reported by RCFMC that the size of catch of those species by various fishing gear indicating that value of Lc<Lm or in other word that catches are in juvenile stage. The juvenile YFT and BET caught by purse seine were considerably high for 7.9 t (26 %) and 1.5 t (5%) of the total catch 30.29 ton/vessel/trip. YFT and BET caught by pole and line are only 0.71 t (15%) and 0.23 t (5%) of the total catch 4.79 ton/vessel/trip. YFT and BET caught by hand line and troll line were only 17% and 2% of total catch 0.31 ton/vessel/trip. Considering the high pressure of purse seine to juvenile of tuna resource and market preference, so that to the best fishing practice for resource sustainability it is suggestted for tuna management in Banda sea should be not to develop and increase the effort for purse seine and may shift to pole line, hand line and/or troll line are still openated.</p>
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Noren, SR. "Altered swimming gait and performance of dolphin mothers: implications for interactions with tuna purse-seine fisheries." Marine Ecology Progress Series 482 (May 22, 2013): 255–63. http://dx.doi.org/10.3354/meps10286.
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Escalle, L., A. Capietto, P. Chavance, L. Dubroca, A. Delgado De Molina, H. Murua, D. Gaertner, et al. "Cetaceans and tuna purse seine fisheries in the Atlantic and Indian Oceans: interactions but few mortalities." Marine Ecology Progress Series 522 (March 2, 2015): 255–68. http://dx.doi.org/10.3354/meps11149.
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Duffy, Leanne M., Cleridy E. Lennert-Cody, Robert J. Olson, Carolina V. Minte-Vera, and Shane P. Griffiths. "Assessing vulnerability of bycatch species in the tuna purse-seine fisheries of the eastern Pacific Ocean." Fisheries Research 219 (November 2019): 105316. http://dx.doi.org/10.1016/j.fishres.2019.105316.
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Imzilen, Taha, Christophe Lett, Emmanuel Chassot, and David M. Kaplan. "Spatial management can significantly reduce dFAD beachings in Indian and Atlantic Ocean tropical tuna purse seine fisheries." Biological Conservation 254 (February 2021): 108939. http://dx.doi.org/10.1016/j.biocon.2020.108939.
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Mannocci, Laura, Yannick Baidai, Fabien Forget, Mariana Travassos Tolotti, Laurent Dagorn, and Manuela Capello. "Machine learning to detect bycatch risk: Novel application to echosounder buoys data in tuna purse seine fisheries." Biological Conservation 255 (March 2021): 109004. http://dx.doi.org/10.1016/j.biocon.2021.109004.
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Arnenda, Gussasta Levi, and Fathur Rochman. "CHARACTERISTICS OF TUNA, SMALL TUNA AND SKIPJACK (TTS) FISHERY IN KUTARAJA OCEAN FISHING PORT, ACEH." Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology 17, no. 2 (August 28, 2021): 90–98. http://dx.doi.org/10.14710/ijfst.17.2.90-98.
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Kutaraja Ocean Fishery Port is the oldest port in Banda Aceh City, Lampulo. Fishery resources are a new potential in the regional economic development of Aceh province. Fish resources that have great potential are from the large pelagic fish groups, including Tuna, Small Tuna and Skipjack (TTS) . Fishery characteristics are used to carry out sustainable fishing. This research was conducted at PPS Kuta Raja, Aceh for one year. Data collection was carried out directly through site surveys and interviews with related fisheries actors. Biological data and capturing aspects were carried out using a stratifield random sampling system by placing enumerators. The results showed that the production of TCT at PPS Kutaraja was dominated by 2 fishing gears, purse seine and hand lines. Based on the results of enumeration in 2020, the estimated total production of tuna skipjack and small tuna at PPS Kuta Raja reaches 11,520 tons. The highest total estimated fish catch is skipjack tuna (Katsuwonus pelamis) (SKJ) 5,802 tons, Bullet tuna (Auxis rochei)(BLT) 2814 tons, Yellow fin (Thunnus albacares) (YFT) 2,452 tons, Krai Tongkol (Auxis thazard) (FRI) 448 tons, and Eastern little tuna (Euthynnus affinis) (KAW) 1,745 tonnes. All of the fish caught were dominated by immature fish. So it is very necessary to evaluate the use of fishing gear or the licensing of FADs. The monthly CPUE distribution pattern is the same, where in August it reaches the highest CPUE and in October it reaches the lowest CPUE value.
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Widodo, Agustinus Anung, and Suryanto Suryanto. "ANALISIS DAMPAK PELARANGAN ALIH MUATAN (TRANSHIMENT) IKAN HASIL TANGKAPAN PADA ARMADA PUKAT CINCIN PELAGIS BESAR (Studi kasus pada perikanan pukat cincin pelagis besar di WPP NRI 716-717 berbasis di Bitung)." Jurnal Kebijakan Perikanan Indonesia 7, no. 2 (November 1, 2015): 93. http://dx.doi.org/10.15578/jkpi.7.2.2015.93-102.
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<p>Kegiatan alih muatan (transhipment) umumnya dilakukan pada kapal pukat cincin pelagis besar yang dioperasikan dengan sistem grup, maka implementasi Permen KP Nomor 57/Permen Kp/2014 menjadi efektif bagi armada tersebut. Kajian dampak kebijakan ini terhadap aspek perikanan dan sumberdaya tuna telah dilakukan di perairan WPP 716 dan 717 khusus bagi perikanan pukat cincin pelagis besar berbasis di Bitung. Untuk kajian ini digunakan data yang dikumpulkan enumerator pada tahun 2013-2014, data pengamatan di atas kapal tahun 2013, dan data kapal yang diperoleh dari Ditjen PSDKP dan WCPFC. Hasil analisis menunjukkan bahwa jeda operasi penangkapan armada pukat cincin yang dioperasikan di WPP NRI 716 dan 717 yang berbasis di Bitung telah mengurangi pasokan bahan baku ke pabrik pengaelangan tuna di Bitung dan sekitarnya sebesar ± 40.968 ton ikan tuna sejak ± 8 bulan terakhir. Dalam rangka memenuhi sebagian pasokan bahan baku ke pabrik pengalengan tuna tersebut, sejak akhir Agustus 2015 sebanyak ± 10 kapal pukat cincin pelagis besar jenis penangkap yang sebelumnya dioperasikan dengan transhipment menjadi tanpa transshipment. Pada kapal-kapal tersebut dilakukan perubahan palkah nya sebelum dioperasikan sehingga memungkinkan tidak melakukan transhipment selama trip operasi penangkapan. Kapal pukat cincin pelagis besar jenis penangkap yang berukuran 181-220 GT dengan kekuatan mesin 600 HP merupakan ukuran ideal. Dengan tanpa beroperasi ± 8 bulan memberikan peluang tumbuh dan memijah bagi ikan dan diperkirakan ± 40.968 ton tuna tidak ditangkap. Ukuran cakalang yang awalnya ± 41 cmFL menjadi ikan dewasa berukuran ± 61 cmFL. Madidihang yang awalnya berukuran 40-41 cmFL menjadi ikan dewasa berukuran ± 70 – 71 cmFL. Bagi ikan tuna mata besar yang awalnya berukuran 40 cmFL menjadi berukuran ± 64 cmFL dan ikan tuna matabesar masih memerlukan ± 15 bulan lagi hingga mencapai ukuran dewasa (Lm 100cmFL).</p><p> </p><p>The practice of transhipment at large pelagic purse seine fleet group system makes the implementation of regulaiton PERMEN KP Nomor 57/Permen Kp/2014 regulation is effective for the fleet. Study on impacts of the practice of transhipment to the tuna fisheries and resources in Indonesian FMA 716 and 717 based at Bitung has been conducted. D ata and information are used in the study were from port sampling program year 2013 and 2014, onboard observer program of 2013, 2015 ship database from the Surveillance Directorate General and WCPFC. The analysis showed that since last 8 months, the operational pauses of the fleet based in Bitung and operating on 716 and 717 WPP NRI have reduced ± 40,968 tonnes of raw materials to the tuna canneries in Bitung and surroundings. Since August 2015 about 10 large pelagic purse seiners that are previously operated as large pelagic purse seiners with transshipment become to large pelagic pure-seiner without transshipment. The fish hold of the purse seiner have been revitalized so that possible to be operated without transhipment during fishing trip. Large pelagic purse seiner 181-220 GT class indicated as ideal size purse seiner that operated without transhipment. Having operational pauses of 8 month, it provides opportunity of 40,968 tonnes of tuna to grow and spawn. It is estimated the size of skipjack from the initial size of 41 cm FL become matured fish with size about 61 cmFL. Yellowfin tuna from the initial size of 40-41 cmFL become matured fish with size about 70 – 71 cmFL. Bigeye tuna from the initial size of 40 cmFL become about 64 cmFL and need atleast about 15 month to become matured stage i.e. 100 cmFL.</p>
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Hampton, John, and David A. Fournier. "A spatially disaggregated, length-based, age-structured population model of yellowfin tuna (Thunnus albacares) in the western and central Pacific Ocean." Marine and Freshwater Research 52, no. 7 (2001): 937. http://dx.doi.org/10.1071/mf01049.
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A spatially disaggregated, length-based, age-structured model for yellowfin tuna (Thunnus albacares) in the western and central Pacific Ocean is described. Catch, effort, length-frequency and tagging data stratified by quarter (for the period 1962–99), seven model regions and 16 fisheries are used in the analysis. The model structure includes quarterly recruitment in each region, 20 quarterly age classes, independent growth patterns for juveniles and adults, structural time-series variation in catchability for all non-longline fisheries, age-specific natural mortality, and age-specific movement among the model regions. Acceptable fits to each component data set comprising the log-likelihood function were obtained. The model results suggest that declines in recruitment, and as a consequence, population biomass, have occurred in recent years. Although not obviously related to over-exploitation, the recruitment decline suggests that the productivity of the yellowfin tuna stock may currently be lower than it has been previously. Recent catch levels appear to have been maintained by increases in fishing mortality, possibly related to increased use of fish aggregation devices in the purse-seine fishery. A yield analysis indicates that average catches over the past three years may have slightly exceeded the maximum sustainable yield. The model results also reveal strong regional differences in the impact of fishing. Such heterogeneity in the fisheries and the impacts on them will need to be considered when future management measures are designed.
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Widodo, Agustinus Anung, Ignatius Trihargiyatno, Regi Fiji Anggawangsa, and Wudianto Wudianto. "PEMANFAATAN DAN PENGELOLAAN TUNA NERITIK DI WILAYAH PENGELOLAAN PERIKANAN NEGARA REPUBLIK INDONESIA (WPPNRI) 573." Jurnal Penelitian Perikanan Indonesia 26, no. 1 (March 17, 2020): 11. http://dx.doi.org/10.15578/jppi.26.1.2020.11-20.
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Dalam rangka mendeskripsikan pemanfaatan dan inisiasi pengelolaan perikanan tuna neritik di WPPNRI 573, telah dilakukan penelitian dengan mengambil kasus perikanan tuna neritik berbasis di PPN Prigi-Jawa Timur. Data diperoleh melalui program port sampling pada tahun 2013-2017. Hasil penelitian menunjukkan produksi tuna neritik yaitu tongkol lisong (BLT), tongkol krai (FRI), tongkol komo (KAW), dan tongkol abu-abu (LOT) rata-rata sebesar 8.120 ton per tahun. Dari jumlah tersebut, 99,56% diproduksi melalui perikanan pukat cincin (PS) dan sisanya dari perikanan jaring insang hanyut (dGN), payang (DS), dan pancing tonda-pancing ulur (TR-sHL dan dHL). CPUE nominal PS selama 5 tahun terakhir terus menurun, rata-rata 0,891 ton/hari. Komposisi jenis tangkapan PS meliputi BLT (91,52 %), FRI (6,68 %), KAW (1,78 %) dan LOT (0,01 %). Sebanyak 99% BLT yang tertangkap PS merupakan ikan yuwana, sedangkan FRI, KAW, dan LOT sebagian besar tertangkap pada ukuran dewasa masing sebanyak 73%, 70%, dan 55%. Tuna neritik termasuk spesies peruaya jauh, maka pengelolaannya di WPPNRI 573 harus mengacu pada acuan pengelolaan Indian Ocean Tuna Commission (IOTC). Mengacu hasil Work Party Neritic Tuna (WPNT) IOTC tahun 2016 dan 2018, maka pengelolaan perikanan tuna neritik di WPPNRI 573 berbasis di PPN Prigi adalah sebagai berikut: (1) hingga 2025 jumlah hasil tangkapan BLT dan FRI harus dikendalikan masing-masing pada jumlah 9.818 ton dan 48 ton per tahun; (2) hingga 2023 tangkapan KAW ditetapkan pada jumlah ± 98 ton per tahun (80% jumlah tangkapan tahun 2013); dan (3) hingga tahun 2025 jumlah tangkapan LOT disarankan sama dengan tangkapan 2015 yaitu ± 1.13 ton per tahun. To describe the utilization and management initiation of tuna neritic fisheries in the Indonesian FMA-RI 573, a research has been conducted by taking the case at the Prigi Fishing Port, East Java. Data were obtained through the port sampling program in 2013-2017. Results show that the production of neritic tuna, namely bullet tuna (BLT), frigate tuna (FRI), kawa-kawa (KAW), and longtail tuna (LOT) was 8,120 tons per year on average. 99.56% of the amount were produced by purse seine (PS) fisheries, the rest came from drifting gill nets (dGN), danish-seine (DS), and the combination of trolling line and surface-deep hand line (TR-sHL and dHL) fisheries. The nominal CPUE of PS over the past 5 years has continued to decline, averaging 0.891 tons/day. The composition of PS catches includes BLT (91.52%), FRI (6.68%), KAW (1.78%) and LOT (0.01%). Large numbers (99%) of the BLT caught by PS were juvenile fish, while at the same time FRI, KAW, and LOT were mostly caught at the adult stage. Neritic tuna is a highly migratory species, so its management in the Indonesian FMARI 573 must refer to the Indian Ocean Tuna Commission-IOTC recommendations. Referring to the results of WPNT-IOTC in 2016 and 2018, the management of neritic tuna fisheries in the Indonesian FMA-RI 573 based at Prigi Fishing Port is as follows: (1) up to 2025, the catches of BLT and FRI must be controlled at 9,818 and 48 tons per year, respectively; (2) up to 2023, the catches of KAW are set at ± 98 tons per year (80% of the total catch in 2013); and (3) up to 2025, the catch of LOT is recommended the same as in 2015, which is ± 1.13 tons per year.
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Duffy, Leanne M., and Shane P. Griffiths. "Assessing attribute redundancy in the application of productivity-susceptibility analysis to data-limited fisheries." Aquatic Living Resources 32 (2019): 20. http://dx.doi.org/10.1051/alr/2019018.
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Productivity-susceptibility analysis (PSA) is a widely used data-limited method to assess the relative vulnerability of species impacted by fisheries. Despite its widespread use, few authors have evaluated the impacts of attribute weightings and correlation of productivity attributes that may bias species' vulnerability scores. We evaluated the PSA methodology and performed sensitivity analyses to determine the impacts of correlation among productivity attributes used in the PSA, given that several of these attributes are strongly correlated. A PSA for species caught in the eastern Pacific Ocean tuna purse-seine fishery was used as an example to assess potential bias introduced by attribute weightings and correlation of productivity attributes on species' vulnerability scores. Redundancy was observed among three pairs of attributes. We demonstrated that manipulation of attribute weightings and removal of correlated attributes did not appreciably change any species' overall vulnerability status. Our results suggest that after removal of redundant attributes, PSAs can be conducted more rapidly with fewer data inputs than previous implementations, while retaining comparable vulnerability scores.
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Maufroy, Alexandra, David M. Kaplan, Nicolas Bez, Alicia Delgado De Molina, Hilario Murua, Laurent Floch, and Emmanuel Chassot. "Massive increase in the use of drifting Fish Aggregating Devices (dFADs) by tropical tuna purse seine fisheries in the Atlantic and Indian oceans." ICES Journal of Marine Science 74, no. 1 (October 26, 2016): 215–25. http://dx.doi.org/10.1093/icesjms/fsw175.
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Since the mid-1990s, drifting Fish Aggregating Devices (dFADs), artificial floating objects designed to aggregate fish, have become an important mean by which purse seine fleets catch tropical tunas. Mass deployment of dFADs, as well as the massive use of GPS buoys to track dFADs and natural floating objects, has raised serious concerns for the state of tropical tuna stocks and ecosystem functioning. Here, we combine tracks from a large proportion of the French GPS buoys from the Indian and Atlantic oceans with data from observers aboard French and Spanish purse seiners and French logbook data to estimate the total number of dFADs and GPS buoys used within the main fishing grounds of these two oceans over the period 2007–2013. In the Atlantic Ocean, the total number of dFADs increased from 1175 dFADs active in January 2007 to 8575 dFADs in August 2013. In the Indian Ocean, this number increased from 2250 dFADs in October 2007 to 10 300 dFADs in September 2013. In both oceans, at least a fourfold increase in the number of dFADs was observed over the 7-year study period. Though the relative proportion of natural to artificial floating objects varied over space, with some areas such as the Mozambique Channel and areas adjacent to the mouths of the Niger and Congo rivers being characterized by a relatively high percentage of natural objects, in no region do dFADs represent <50% of the floating objects and the proportion of natural objects has dropped over time as dFAD deployments have increased. Globally, this increased dFAD use represents a major change to the pelagic ecosystem that needs to be closely followed in order to assess its impacts and avoid negative ecosystem consequences.
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Poisson, François, Bernard Séret, Anne-Lise Vernet, Michel Goujon, and Laurent Dagorn. "Collaborative research: Development of a manual on elasmobranch handling and release best practices in tropical tuna purse-seine fisheries." Marine Policy 44 (February 2014): 312–20. http://dx.doi.org/10.1016/j.marpol.2013.09.025.
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Lezama-Ochoa, Nerea, Hilario Murua, Jon Ruiz, Pierre Chavance, Alicia Delgado de Molina, Ainhoa Caballero, and Igor Sancristobal. "Biodiversity and environmental characteristics of the bycatch assemblages from the tropical tuna purse seine fisheries in the eastern Atlantic Ocean." Marine Ecology 39, no. 3 (June 2018): e12504. http://dx.doi.org/10.1111/maec.12504.
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Agustina, Maya, Irwan Jatmiko, and Ririk Kartika Sulistyaningsih. "KOMPOSISI HASIL TANGKAPAN DAN DAERAH PENANGKAPAN PANCING ULUR TUNA DI PERAIRAN SENDANG BIRU." Jurnal Penelitian Perikanan Indonesia 25, no. 4 (December 12, 2019): 241. http://dx.doi.org/10.15578/jppi.25.4.2019.241-251.
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Tuna, cakalang dan tongkol (TCT) merupakan jenis hasil tangkapan ikan yang memiliki nilai ekonomis penting dan masih terdapat peluang untuk dimanfaatkan. Salah satu sentra perikanan tuna, cakalang dan tongkol di kawasan Indonesia Barat yang terbesar adalah di Kabupaten Malang tepatnya di Pelabuhan Perikanan Pantai (PPP) Pondokdadap Sendang Biru. Jenis alat penangkapan ikan yang digunakan oleh nelayan untuk menangkap tuna di perairan ini adalah pancing ulur (handline) yang dioperasikan dengan menggunakan bantuan rumpon. Tujuan penelitian ini adalah untuk mengetahui informasi sebaran daerah penangkapan (teritorial, ZEE dan laut lepas) dan bagaimana dinamika hasil tangkapannya khususnya tuna, cakalang dan tongkol. Pancing ulur mendominasi alat penangkapan ikan yang digunakan di PPP Pondokdadap, Sendang Biru tercatat sebanyak 70,42%, sedangkan pukat cincin sebanyak 9,82% dan pancing rawai sebanyak 19,76%. Jenis hasil tangkapan pancing ulur terbanyak adalah cakalang dan juwana tuna. Daerah penangkapan nelayan pancing ulur yang berbasis di PPP Pondokdadap, Sendang Biru menyebar pada kawasan perairan dengan batasan antara 8º – 12º LS dan 108º – 115º BT atau secara geografis berada di dalam perairan teritorial, ZEE dan di laut lepas. Prosentase hasil tangkapan TCT yang tertangkap pancing ulur berdasarkan wilayah perairan seperti berikut: teritorial sebanyak 0,63%, ZEE sebanyak 78,68% dan di luar ZEE (laut lepas) sebanyak 20,69%. Tuna, skipjack and little tuna are economically important and still has the potential to cathed. One of the fisheries centers tuna, skipjack and little tuna landing site in the western part of Indonesia is in Malang located at Pondokdadap Sendang Biru fishing port. The fishing gear commonly used by Sendang Biru fishermen to catch tuna in the Indian Ocean waters is handline which is operated around FADs. The purpose of this study was to find out information the distribution of fishing areas (territorial, EEZ and high seas) and how the dynamics of the catch especially tuna, skipjack and little tuna. The dominant fishing gear in PP Pondokdadap Sendang Biru is the handline with 70.42%, followed by purse seine 9.82% and longlines 19.76%. The dominant catches caught by handline were skipjack and juvenile of yellowfin tuna. Fishing ground of hand line based in PP Pondokdadap located in waters with boundaries between 8º - 12º LS and 108º - 115ºBT or geographically located in the waters territorial, EEZ and on the high seas. Tuna catches precentage caught by handline in territorial, EEZ and high seas, accounting for 0.63%, 78.68% and 20.69%, respectively.