Academic literature on the topic 'Purse seine fisheries'
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Journal articles on the topic "Purse seine fisheries":
1
Chodrijah, Umi, and Wiwiet An Pralampita. "KAJIAN SISTEM PERIKANAN MINI PURSE SEINE DI TEMPAT PENDARATAN IKAN TASIK AGUNG, REMBANG, JAWA TENGAH." Jurnal Kebijakan Perikanan Indonesia 2, no. 2 (February 2, 2017): 91. http://dx.doi.org/10.15578/jkpi.2.2.2010.91-99.
Abstract:
Perikanan mini purse seine di Tempat Pendaratan Ikan Tasik Agung, Rembang sangat kompleks, sehingga perlu pendekatan sistem untuk melakukan pengkajian. Perikanan mini purse seine ini melibatkan banyak pelaku atau pihak yang saling berinteraksi. Pihak yang terlibat dalam kegiatan sistem perikanan tersebut adalah nelayan, pedagang, industri pengolahan ikan, konsumen, Dinas Perikanan, Pemerintah daerah, dan Koperasi Unit Desa. Sub model yang digunakan dalam analisis sistem perikanan mini purse seine di Tempat Pendaratan Ikan Tasik Agung, Rembang adalah sub model sumber daya ikan, teknis, usaha penangkapan mini purse seine, harga ikan, mutu dan pemasaran, pendapatan nelayan, dan pendapatan daerah.Mini purse seine fishery in the Tempat Pendaratan Ikan Tasik Agung,Rembang is very complex, so it needs a systems approach to conduct the assessment. Mini purse seine fishery involves many actors or parties interacting. Parties involved in fisheries systems are fishermen, traders, fish processing industry, consumers, Fisheries, Local Government, and KUD. Sub model used in the analysis of the mini purse seine fishery system at Tempat Pendaratan Ikan Tasik Agung, Rembang is a sub model of fish resources, technical, mini purse seine fishing effort, fish prices, quality, and marketing, the income of fishermen, and local revenue.
2
Wattimury, Margie. "EFISIENSI DAN KEBERLANJUTAN USAHA PURSE SEINE DI KABUPATEN MALUKU TENGAH DAN KOTA AMBON." PAPALELE (Jurnal Penelitian Sosial Ekonomi Perikanan dan Kelautan) 3, no. 1 (June 1, 2019): 38–51. http://dx.doi.org/10.30598/papalele.2019.3.1.38.
Abstract:
The level of purse seine business income is determined by the efficient allocation of resources for alternative capture fisheries activities. If resources are not used efficiently, there will be unexploited potential to increase income and create surpluses. Conversely, if resources are allocated efficiently, additional capture fisheries can be obtained through growth-oriented development efforts. Therefore, it is important to identify the efficient use of resources to determine the existence of purse seine fisheries. The results show that the estimated technical efficiency of the catch with SPF (Stochastic Production Frontier) analysis for purse seine fisheries in Central Maluku Regency and Ambon was influenced by the length and width of fishing gear, number of fishermen, amount of investment value and time of capture operations. The minimum value of catch technical efficiency is 0.10 and the maximum is 0.99 with an average 0.48. Factors influencing the technical inefficiency of fishing are the experience of captain and the education level of fishermen. Purse seine fishery business in Central Maluku Regency and Ambon City is feasible to be developed, showing by NPV value Rp. 30,514,684 / year, IRR 23.97% and B / C ratio 5.85. The average return on investment (PP) based on the analysis is 2.16 years, with BEP price Rp. 6,606 and BEP production 3,765 kgs. The main priorities of purse seine fisheries development policy strategy in Central Maluku Regency and Ambon are the development of assistance to fishing groups, the development of appropriate technology to handle catches, increase fisheries production, and infrastructures development.
3
Tenningen, Maria, Armin Pobitzer, Nils Olav Handegard, and Karen de Jong. "Estimating purse seine volume during capture: implications for fish densities and survival of released unwanted catches." ICES Journal of Marine Science 76, no. 7 (July 4, 2019): 2481–88. http://dx.doi.org/10.1093/icesjms/fsz119.
Abstract:
Abstract High fish densities negatively impact catch welfare and the survival of unwanted catches released from purse seines. To avoid overcrowding fish before being released, regulations have been implemented in the Northeast Atlantic mackerel and herring fisheries that limit the proportion of the seine that can be retrieved before catches are released. However, it is yet unknown how seine volume, and thus fish density, relates to proportion of seine retrieved. In this study, we have estimated the in-water volume of purse seines used in the Norwegian mackerel and herring fisheries as a function of proportion seine hauled and seine size. Purse seine geometry was monitored with multibeam sonar at sea and a log-linear mixed effects model was applied to the estimated seine volumes. The results indicate a 33-fold decrease in contained volume from 10 to 80% seine hauled and a threefold difference in volume between the largest and smallest measured seines. Fish densities in the seine were predicted to vary greatly depending on seine and catch size and under some conditions exceed safe crowding levels before the catch release limit is reached. This study questions the rationale of having the same catch release limit for all seine and catch sizes.
4
Dinh, Xuan Hung, Phan Phuoc Long Nguyen, and Xuan Lam Tran. "Status of using rope in purse seine fisheries in Viet Nam." Can Tho University Journal of Science 13, no. 2 (July 29, 2021): 26–31. http://dx.doi.org/10.22144/ctu.jen.2021.027.
Abstract:
This study is to investigate the status of using rope in purse seine fisheries in Viet Nam based on surveyed data from 13 provinces/cities across country. Statistic data were taken randomly from 30 purse seine samples per each region of North, Middle, and South by pre-designed questionnaire with direct survey method of fishing gears combined with interview with the owners/captains. The results indicated that the initial constructing and annual replacing ropes of purse seine is mainly concentrated in the group of diameters from 10 - 20 mm. Up to 98% of Polypropylene (PP) material is used in Vietnamese purse seine. Float line and lead line are used the most ropes in purse seine. In purse seine fisheries, the annual additional rope is one quarter of the original amount of rope fitted. Purse seine in the Middle and the South is larger than that in the North of Viet Nam. The ratio of lengths between the float line and the lead line among the regions is different. The ratio of the main purse line with the lead line ranges from 1.1 to 1.75. Average life expectancy of main purse line is lowest in rope types of the purse seiners. The characteristics of the fishing grounds are different in these three regions, so the rope of purse seine is also different.
5
Hawati, Angkasa Putra, Herianto Suriadin, Sarifah Aini, Nasrun Nurma, and Rakhma Fitria Larasati. "Study of Main Factors Caused Incompatibility of the Purse Seine Fisherman Zone in Panyula Village, Bone Regency, South Sulawesi Based on Regulation of the Minister of Marine and Fisheries Number 71 of 2016." International Journal of Science and Society 4, no. 4 (December 16, 2022): 577–81. http://dx.doi.org/10.54783/ijsoc.v4i4.606.
Abstract:
Regulation of the Minister of Marine Affairs and Fisheries of the Republic of Indonesia Number 71/PERMEN.KP/2016 concerning Fishing Paths and Placement of Fishing Equipment in the Fisheries Management Area of the Republic of Indonesia in article 22 paragraph (1) that the placement of fishing gear and fishing aids in WPP RI is adjusted to the nature of fishing gear. Referring to these regulations, this research was conducted to examine the main factors causing the ignorance of the purse seine fishing zone for fishermen in Panyula Village, Bone Regency, South Sulawesi. This research was conducted from November 2016 to March 2017 in Panyula Village, which is the fishing base area of purse seine fishermen and the waters of Bone Bay. This study uses a combination of survey and case study methods. This study uses two types, namely primary data and secondary data.The analysis of the factors causing the non-conformance was analyzed descriptively, namely comparing the average productivity of ring seines that catch in the designated zone and ring seines that catch in zones that are not according to their designation according to Minister of Marine Affairs and Fisheries Regulation Number 71 of 2016. After the study, the main cause of non-compliance with the Regulation of the Minister of Maritime Affairs and Fisheries Number 71 of 2016 is the high productivity of ring trawl units that carry out fishing on non-designated fishing lanes compared to ring trawl units that catch on correct fishing routes.
6
Sin, Moe Shwe, Lavaniya Gopabala Krishnan, Shzee Yew Tai, Azlina Abd Aziz, and Mahirah Kamaludin. "Comparison of Accounting Profit Between Offshore and Deep-sea Commercial Fishing Industry in Pahang State, East Coast of Peninsular Malaysia." Jurnal Ilmiah Perikanan dan Kelautan 15, no. 2 (May 30, 2023): 374–93. http://dx.doi.org/10.20473/jipk.v15i2.42202.
Abstract:
Highlight Research Economic performance of commercial fishing industry in Pahang State, East Coast of Peninsular Malaysia. Comparison of accounting profit between the two prominent fishing gear types: trawlers and purse seine in Pahang State Comparison of accounting profit between the different zones of fishing operations by the trawlers and purse seine Research findings showed that trawlers give more profit than purse seine vessels in Pahang State and overcapacity and over exploitation is distinctly found in Pahang State commercial fishing industry. This study suggested that other analysis such as biological performance by this study area should be done in future coupled with the analysis of impact of management policies on the sustainability of the fishery. Abstract Marine capture fisheries in Malaysia plays prominent role in economic growth and commercial fisheries makes great contribution to country’s economy. The commercial fishing industry in East Coast of Peninsular Malaysia are mainly operated by trawlers and purse seines which rises a major concern in managing and achieving the goal of sustainable fishery. This study aimed to account the differences of accounting profit level in commercial fishing industry in Pahang State, East Coast of Peninsular Malaysia. In this study, comparison of accounting profits using revenue and profit approach among trawl and purse seine fishery in two different zones: Zone C (offshore) and Zone C2 (deep sea) was carried out based on the intensive survey on fishing capacity and other economic factors. The survey was carried out with the commercial fishermen and total respondents of 156 fishers at landing port. The result showed that trawlers incurred low cost yet provided higher profit than doses by purse seine. Moreover, there are more trawlers vessels operating in the Pahang state fishing ground and the open access nature of the fishery like larger profit invites more effort to use in the fishery which is leading to the over exploitation of fishery resources and threatening the sustainable condition of the fishery. The findings of the research inform the possible impact of fishing profit to overcapacity in sustainable fishery management in Pahang State fishery.
7
Tanjov, Yulia Estmirar, Roza Yusfiandayani, and Mustaruddin. "RESPONSIBLE FISHERIES MANAGEMENT OF MINI PURSE SEINE IN THE LAMPUNG BAY AREA." Jurnal Ilmu dan Teknologi Kelautan Tropis 8, no. 2 (April 6, 2017): 713–28. http://dx.doi.org/10.29244/jitkt.v8i2.15837.
Abstract:
Lempasing is a Coastal Fishing Port (CFP) which located in Bandar Lampung. It is one of the centers of fisheries activities in the city. One of the fishing gear which operated by most of fishermen in Lempasing is mini purse seine. Mini purse seine fishing activities in the Lampung Bay Area and Lempasing CFP is not in accordance with the conditions of the surrounding waters area. The research was conducted in the Lampung Bay Area and Lempasing CFP, Lampung. This study aims to: 1) determine the status of fisheries resources utilization, 2) to describe the dominant fish caught by mini purse seine. Analysis methods were used in this study namely: 1) Fishing Power Index (FPI), Catch Per Unit Effort (CPUE), and Maximum Sustainable Yield (MSY) to determine the status of fisheries resource utilization. The dominant small pelagic fishes caught were scad fish Selaroides sp., mackerel fish Rastrelliger sp., longnose trevally fish Carangoides chrysophrys. The result showed that Fox model was the best fits models with estimated maximum sustainable yield of 15.5 ton and fishing effort of 992 trip/year for mini purse seine. The longnose trevally fish in lampung bay area in do not exceeded the optimal catch fish condition can be used to sustainably. In these condition is necessary to wisely manage and setting the catches to not exceed the allowable catch of the small pelagic fish, so the stock of small pelagic fish in the Lampung Bay Area can be used sustainably.
8
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.
Abstract:
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.
9
Mardiah, Ratu Sari, Yaser Krisnafi, and Tyas Dita Pramesthy. "Sebaran Pelagis Besar Hasil Tangkapan Purse Seine di Indonesia." JSIPi (JURNAL SAINS DAN INOVASI PERIKANAN) (JOURNAL OF FISHERY SCIENCE AND INNOVATION) 7, no. 2 (July 23, 2023): 136–42. http://dx.doi.org/10.33772/jsipi.v7i2.159.
Abstract:
Purse seine catches that have high economic value are big pelagic whose distribution of fishing areas and landing sites are poorly known. This study aims to find out the distribution of large pelagic purse seine catches based on WPP and their landing ports. The data used is data of purse seine catch from the Ministry of Maritime Affairs and Fisheries of the Republic of Indonesia in 2019 and 2020 to be analyzed descriptively. The results showed that four big pelagic species caught by purse seines: tuna (Thunnus sp.), mackerel (Scomberomorus commerson), marlin (Istiophorus platypterus) and swordfish (Xiphias gladius). Tuna is caught in all WPP and landed at 62 fishing ports. Mackerel was also caught in all WPP and landed at 74 fishing ports. Marlin were caught at 10 WPP and landed at 27 fishing ports. Swordfish were caught in 4 WPP and landed at 5 fishing ports. Knowledge on distribution of big pelagic purse seine catches based on WPP and landing ports can be used as a basis for evaluating measured fishery policies in terms of catch landing relating to fishing areas.
10
Kharie, M. Farid, Umar Tangke, Ruslan Laisouw, Darmawaty Darmawaty, and Siti Masiyah. "Analysis of Purse Seine Vessel Operations Based at PPI Dufa-Dufa." Agrikan Jurnal Agribisnis Perikanan 16, no. 1 (June 27, 2023): 301–9. http://dx.doi.org/10.52046/agrikan.v16i1.1638.
Abstract:
Fisheries activities in Ternate City are developing well, this is supported by the operation of the Fish Landing Base (PPI) and the Ternate Nusantara Fishing Port. Information on effective fishing units and operations that have high productivity is important in the development of capture fisheries in PPI Dufa-Dufa, so that purse seine fisheries in PPI Dufa-Dufa is expected to be profitable and sustainable, therefore research on purse seine vessel operations needs to be done by considering all related aspects. The research took place from June to August 2014 at PPI Dufa-Dufa Ternate City by using descriptive analysis and effectiveness and efficiency analysis using scoring method to determine the level of effectiveness and efficiency analysis of purse seine vessel operational activities. The results of the study found that larger vessels (GT more than 20) have higher effectiveness and efficiency values than small vessels (GT less than 20). Purse seine operations at PPI Dufa-Dufa still allow for the development of operational activities, namely the development of new areas for fishing, improving fishing technology and increasing the quality value of catches in the form of training in handling catches
Dissertations / Theses on the topic "Purse seine fisheries":
1
Correia, Cláudia Sofia da Silva. "Study of Atlantic chub mackerel's (Scomber colias, Gmelin, 1789) landings evolution in Portugal: importance for purse seine fleet." Master's thesis, Universidade de Évora, 2016. http://hdl.handle.net/10174/19949.
Abstract:
The Portuguese purse seine fishery could be sustainable if measures to promote multi-specify catches are placed.
Chub mackerel is one of the top three species landed by purse seine and landings have been increasing, which could be partly explained by Docapesca’s campaign promoting chub mackerel consumption.
Therefore, it is necessary to understand if chub mackerel could represent a sustainable alternative.
Results point to overexploitation levels, already exceeding estimated Maximum Sustainable Yield (MSY). The break point was registered in 2011, when chub mackerel landings surpassed 30 thousand tonnes landed, which is far beyond MSY estimates by Schaefer’s (24 703 ton), Gulland’s (21 750 ton) and Cadima’s (23 250 ton) models.
Chub mackerel could represent an alternative to purse seine fisheries if: (i) a catch limit is established; (ii) measures to promote a regulated market on supply and demand laws are placed; (iii) research investment is augmented; Estudo da evolução dos desembarques de cavala (Scomber colias, Gmelin, 1782) em Portugal: sua importância para a pesca de cerco.
Resumo:
A pesca de cerco em Portugal poderá ser sustentável se forem implementadas medidas para a sua diversificação. A cavala é uma das três espécies mais capturadas pelo cerco, tendo-se observado um aumento dos desembarques nos últimos anos, parte explicado pela campanha focada no seu consumo, promovida pela Docapesa.
Torna-se necessário compreender se a cavala poderá constituir uma alternativa sustentável.
Os resultados apontam para níveis de exploração acima do Rendimento Máximo Sustentável (RMS) estimado, atingido em 2011, quando os desembarques de cavala ultrapassaram as 30 mil toneladas, acima do RMS estimado de acordo com Schaefer (24 703 ton), Gulland (21 750 ton) e Cadima (23 250 ton), mantendo-se a tendência de sobre-exploração.
A cavala poderá ser uma alternativa para o cerco se: (i) estabelecido um limite de captura; (ii) criadas medidas de promoção de um mercado regulado pela lei da oferta e da procura (iii) aumentar o investimento em investigação.
2
Escalle, Lauriane. "Spatio-temporal interactions between whale sharks, cetaceans and tropical tuna purse-seine fisheries, within a conservation perspective, in the Atlantic and Indian Oceans." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT125/document.
Abstract:
Dans le cadre de l’Approche Ecosystémique des Pêches (AEP), il est nécessaire d’évaluer l’impact de la pêche thonière tropicale à la senne sur les espèces ciblées et sur les espèces accessoires. Parmi ces dernières, les espèces de la mégafaune, telles que des requins, raies, cétacés, tortues, oiseaux marins, sont souvent emblématiques et vulnérables. Les thoniers senneurs tropicaux recherchent activement à la surface de l’eau tout indice de la présence de bancs de thon (e.g. oiseaux, objets flottants, baleines, dauphins ou requins baleines). Dans l’est de l’océan Atlantique et l’ouest de l’océan Indien, les deux modes de pêches principaux sont les captures de thons en bancs libres et celles sur bancs associés à un objet flottant, naturel ou artificiel, rassemblés ici sur sous le terme de dispositif de concentration de poisson (DCP). Les calées associées aux requins baleines et aux cétacés sont toutefois peu étudiées. L’objectif de cette thèse est donc d’analyser les co-occurrences et/ou interactions spatio-temporelles entre requins baleines, cétacés et pêche thonière à la senne, dans une perspective de conservation de l’écosystème. Ce travail, basé sur des données de livres de bord et d’observateurs scientifiques embarqués, a montré que la co-occurrence pêche thonière/ mégafaune se localise dans des strates spatio-temporelles relativement précises: i) du Gabon à l’Angola (avril–septembre), ii) dans le Canal du Mozambique (juin–septembre) et iii) à l’est des Seychelles (avril–septembre). Les baleines et requins baleines étant planctivores, la co-occurrence avec la pêche à la senne est principalement liée à une forte productivité primaire (appréhendée à travers des proxys tels que la concentration en chlorophylle-a). De plus, les calées sur ces deux groupes étaient assez élevées avant 2000 (jusqu’à 20% des calées), et qu’elles sont moins fréquentes aujourd’hui (AC3 et 1,5% des calées associées à des baleines et des requins baleines, respectivement). L’impact de la pêche à la senne sur ces espèces semble relativement faible au regard du taux de mortalité apparente de 1,4% pour les requins baleines et 5,6% pour les cétacés. Des marquages satellites réalisés sur les requins baleines, confirment ces observations sur le plus long terme, mais la taille de l’échantillon limite la formulation de conclusions définitives. Concernant les dauphins, bien que présents sur les zones de pêche, ils interagissent très peu avec celle-ci, soulignant ainsi une différence majeure avec l’océan Pacifique est où ce mode de pêche est majoritaire. La diversité spécifique des espèces cible et accessoire associées aux calées sur mégafaune a également été étudiée. Les requins baleines sont associés aux listaos et à l’albacore (dans une large gamme de tailles), alors que les baleines le sont principalement à de gros albacores. De plus, la capture accessoire associée à ces deux groupes de mégafaune est relativement faible et dominée par le requin soyeux et la diversité spécifique est proche de celle trouvée sous les bancs libres de thons. Enfin les effets de mesures de conservation vis-à-vis de la mégafaune encerclée ou de mesures de gestion de l’effort de pêche, notamment les moratoires sur DCP réelles ou simulées (e.g. moratoires élargis), ont été analysés. Les premières ont eu un effet limité en terme de captures cibles et accessoires, alors que les moratoires impactent peu le nombre de calées associés à la mégafaune, ceci en raison du décalage spatio-temporel des co-occurrences. Cependant des moratoires élargis pourraient être bénéfiques pour les thons juvéniles et certaines espèces associées. Par l’analyse quantitative des interactions entre la pêche thonière à la senne et la mégafaune, cette thèse apporte des connaissances essentielles sur les espèces étudiées dans le cadre de la mise en place d’une AEP, applicable à la pêche thonière tropicaleIn the frame of the Ecosystem Approach to Fishery (EAF) management, impact of the tropical tuna purse-seine fishery on targeted and incidentally captured species should be investigated. They may include megafauna species, such as sharks, rays, cetaceans, turtles or sea birds, which often are emblematic and vulnerable species. Tropical tuna purse-seiners actively search, at the surface of the sea, for clues indicating the presence of tuna schools (e.g. birds, floating objects, whales, dolphins or whale sharks). In the eastern Atlantic and western Indian Oceans, the main two fishing modes are sets on free swimming tuna schools and schools associated to natural or artificial floating objects, thereafter called Fish Aggregating Device (FAD). However dedicated studies on fishing sets associated to whale sharks and cetaceans are still lacking. The aim of this thesis is therefore, using logbook and scientific onboard observer data, to investigate the spatio-temporal co-occurrences and/or interactions between whale sharks, cetaceans and the tuna purse-seine fishery within an ecosystem conservation perspective. This work underlines that the megafauna/ fishery co-occurrence occurs in specific spatio-temporal strata: i) Gabon to Angola (April–September), ii) the Mozambique Channel (June–September), and iii) East of Seychelles (April–September). As baleen whales and whale sharks are filter feeders, the co-occurrence with the purse-seine fishery was mostly linked to highly productive environments (i.e. using proxys including chlorophyll-a concentration). In addition fishing sets involving megafauna were relatively high before 2000 (up to 20% of the sets), but are nowadays less frequent (AC3 and 1.5% of the sets associated to baleen whales and whale sharks). The purse-seine fishery appears to have a relatively low impact on megafauna species with mortality rates of 1.4% for whale sharks and 5.6% for cetaceans. Whale shark satellite tagging also confirms these results on the longer term, but the low sample size precludes any final conclusion. While dolphins are present in fishing areas, very few interactions with the fishery was detected, which highlights the striking difference with the eastern Pacific Ocean where half the sets are associated to dolphin herds. In addition, the diversity of targeted and bycatch species captured under whale shark and baleen whale sets was also investigated. Whale sharks are principally associated to skipjack and yellowfin (of various sizes) tunas and baleen whales mostly to large yellowfin tuna. In addition, bycatch species associated to these two megafauna groups was relatively low and dominated by the silky shark, and bycatch diversity was close to the one found for free swimming tuna schools. Finally, real and/or simulated encircled megafauna conservation measures or fishing effort management measures (especially FAD moratoria including larger ones) were investigated. The first ones were found to have limited consequences on tuna catch and bycatch. Conversely FAD moratoria had limited impacts on the number of megafauna associated fishing sets, due to the fact that the main spatio-temporal strata of megafauna and FAD sets differ. However larger and longer moratoria could be beneficial for juvenile tuna and some bycatch species. Overall, this thesis has lead to increase the knowledge on megafauna/ fishery interactions, essential in the general framework of setting up an EAF in the tropical tune purse-seine fishery
3
Snouck-Hurgronje, Julia. "The Effects of Drifting Fish Aggregating Devices on Bycatch in the Tropical Tuna Purse Seine Fisheries in the Atlantic and Indian Oceans." W&M ScholarWorks, 2016. https://scholarworks.wm.edu/etd/1499449678.
Abstract:
Thousands of floating objects, known as drifting fish aggregating devices (dFADs), are released every year by commercial tropical tuna purse seine vessels in the three equatorial oceans to aggregate tuna and increase catch. The escalation in the number of dFADs deployed over the last three decades has caused changes in fishing effort that are poorly reflected in traditional indices of purse seine effort and catch per unit of effort (CPUE). In addition, concerns have been raised regarding the impacts of such high numbers of dFADs being deployed on both catch and bycatch species. I studied two aspects of dFAD deployments in order to clarify how dFADs are used by purse seiners and how they affect the magnitude of bycatch. My specific goals were to determine how often purse seine vessels fish on the dFADs they deploy and how regional dFAD density affects the magnitude of bycatch and catch. I analyzed commercial data, independent observer data, satellite buoy trajectories, and estimated floating object densities from the French tropical tuna purse seine fisheries in the Atlantic and Indian Oceans to examine these relationships. My results indicate that only 2.7-20.6% of dFAD fishing sets were on the dFADs that French purse seiners deployed over the period 2007-2013. Although this percentage increased over time, such a low percentage suggests that French vessels do not primarily increase CPUE by using the dFADs they deploy for directed fishing. If French purse seiners are not mainly using their own dFADs in this manner, then using a metric of nominal effort based on individual vessel activity is unlikely to produce reliable CPUE estimates for the fishery. While information about how often purse seiners fish on their own dFADs could be incorporated into indices of fishing effort, it may be just as important, if not more so, to quantify the collective component of dFAD releases for overall fishing effort. The results for the second objective showed that average dFAD density had a relatively weak relationship with total bycatch biomass. There was no statistically significant effect on mean total bycatch biomass, but dFAD density was related to heteroscedasticity in bycatch biomass. In particular, there was a significant negative relationship between dFAD density and the upper quantiles of the bycatch biomass distribution, suggesting that dFAD density determines the upper bound for bycatch biomass caught per set. These relationships were not constant across species, however, as the five most prevalent bycatch species (i.e., those caught in the greatest number of sets) showed a mix of positive, negative, or no relationships to dFAD density. The total biomass of catch increased significantly as average dFAD density increased both at the mean and throughout the majority of the distribution, although this effect only explained a small fraction of the total variance in catch biomass. at this time, the low amount of variance explained and the inconsistent impact of average dFAD density on bycatch and target species indicate that it would be ineffective to mitigate bycatch levels in these fisheries by attempting to control regional dFAD densities.
4
Liao, Chun-Pei, and 廖君珮. "Strategy Analysis of Fisheries Cooperation between Taiwan Distant Water Tuna Purse Seine Fishery and Pacific Island Countries by Game Theory." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/e5y4rs.
Abstract:
碩士國立臺灣海洋大學
海洋事務與資源管理研究所
102
To be confronted with population growth, fishery resources have been a major source of protein for human. In virtue of some reasons, like nutritive value, tuna species are popular among others. The tuna industry in the Western and Central Pacific Ocean (WCPO) is one of the largest and most valuable fisheries in the world and many countries developed their tuna fisheries there. The tuna fishery in WCPO is complicated with Regional Fisheries Management Organisations (RFMOs), agreements, treaty and scheme. The South Pacific Committee (SPC) established in 1947 as the oldest RFMOs, Forum Fisheries Agency (FFA) in 1979 and Western and Central Pacific Fisheries Commission (WCPFC) in 2004. The fishery cooperations between Pacific island countries (PICs) and distant water fishing nations (DWFNs) by multilateral agreements or bilateral agreements, and manage under the scheme, conservation and management measure (CMMs), which include Vessel Day Scheme (VDS) implemented in 2007. This research aims to study of Taiwan purse seine fishery cooperation with PICs in WCPO and analysis by Game Theory, which include Federated States of Micronesia, Kiribati, Marshall Islands, Nauru, Palau, Papua New Guinea, Solomon Islands and Tuvalu. In order to set the game of WCPO tuna purse seine fisheries by the mechanism design, collected the informations by literature analysis method and case study, then use the semi-standardized in-depth interview with the experts. There are totaol 7 games were setted, include two categories and two scenarios. The categories are “The Taiwan Purse Seiner to PICs Game ” and “The Taiwan Purse Seiner to individual PIC Game”, under two scenarios as the high price and low price of fish by 2009-2012. “The Taiwan Purse Seiner to Individual PIC Game” select Kiribati, Papua New Guinea, Marshall Islands as Players by total fishing days and by area. “The Taiwan Purse Seiner to PICs Game” and “The Taiwan Purse Seiner to individual PIC Game”, show the Nash equilibrium, the dominant strategy of PICs is “continue implement the VDS” and for Taiwan is “co-management the purse seine fishery”. The Game of Taiwan-Papua New Guinea and Taiwan-Kiribati show the situation of Taiwan purse seine vessel could be well-manage under the scenario of high price of fish. In the case of Taiwan-Marshall Game, Marshall Islands need work opportunities than access fee, therefor co-management is the dominant strategy remarkably for Taiwan when build fishery cooperation with Marshall Islands.
5
Martins, Sequeira Ana Micaela. "Global distribution models for whale sharks : assessing occurrence trends of highly migratory marine species." Thesis, 2013. http://hdl.handle.net/2440/81551.
Abstract:
The processes driving distribution and abundance patterns of highly migratory marine species, such as filter-feeding sharks, remain largely unexplained. The whale shark (Rhincodon typus Smith 1828) is a filter-feeding chondrichthyan that can reach > 18 m in total length, making it the largest extant fish species. Its geographic range has been defined within all tropical and warm temperate waters around the globe. However, even though mitochondrial and microsatellite DNA studies have revealed low genetic differentiation among the three major ocean basins, most studies of the species are focussed on the scale of single aggregations. Our understanding of the species’ ecology is therefore based on only a small proportion of its life stages, such that we cannot yet adequately explain its biology and movement patterns (Chapter I). I present a worldwide conceptual model of possible whale shark migration routes, while suggesting a novel perspective for quantifying the species‘ behaviour and ecology. This model can be used to trim the hypotheses related to whale shark movements and aggregation timings, thereby isolating possible mating and breeding areas that are currently unknown (Chapter II). In the next chapter, I quantify the seasonal suitable habitat availability in the Indian Ocean (ocean basin-scale study) by applying generalised linear, spatial mixed-effects and maximum entropy models to produce maps of whale shark habitat suitability (Chapter III). I then assess the inter-annual variation in known whale shark occurrences to unearth temporal trends in a large area of the Indian Ocean. The results from the Indian Ocean suggest both temporal and spatial variability in the whale sharks occurrence (Chapter IV). Therefore, I applied the same analysis to the Atlantic and Pacific Oceans using similar broad-scale datasets. While the results for the Pacific Ocean were inconclusive with respect to temporal trends, in the Atlantic Ocean I found preliminary evidence for a cyclic regularity in whale shark occurrence (Chapter V). In Chapter VI, I build a model to predict global whale shark habitat suitability for the present, as well as within a climate change scenario for 2070. Finally, Chapter VII provides a general discussion of the work developed within this thesis and presents ideas for future research.Thesis (Ph.D.) -- University of Adelaide, School of Earth and Environmental Sciences, 2013
Books on the topic "Purse seine fisheries":
1
John Sabella & Associates. and United States Coast Guard, eds. Longline & purse seine safety handbook. Seattle, Wash: Fishing Vessel Owners' Association & Marine Safety Reserve, 1989.
2
W, Smith Joseph, and United States. National Marine Fisheries Service., eds. Gulf menhaden, Brevoortia patronus, purse seine fishery, 1974-85, with a brief discussion of age and size composition of the landings. Seattle: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, 1987.
3
W, Smith Joseph. Distribution of Atlantic menhaden, Brevoortia tyrannus, purse-seine sets and catches from southern New England to North Carolina, 1985-96. Seattle, Wash: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Scientific Publications Office, 1999.
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W, Smith Joseph, ed. Atlantic menhaden, Brevoortia tyrannus, purse seine fishery, 1972-84, with a brief discussion of age and size composition of the landings. Seattle: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, 1987.
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Oliver, Charles W. Development of an airborne LIDAR system to detect tunas in the eastern tropical Pacific purse-seine fishery. La Jolla, Calif: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, [Southwest Fisheries Science Center, 1994.
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Gillett, R. D. Status of the United States western Pacific tuna purse seine fleet and factors affecting its future. [Honolulu, Hawaii: University of Hawaii-NOAA, Joint Institute for Marine and Atmospheric Research, 2002.
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Watters, George M. Geographical distributions of effort and catches of tunas by purse-seine vessels in the eastern Pacific Ocean during 1965-1998 =: Distribuciones geograficas del esfuerzo y las capturas de atunes por barcos cerqueros en el oceano Pacifico oriental durante 1965-1998. La Jolla, Calif: Inter-American Tropical Tuna Commission, 1999.
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Southeastern Alaska roe herring purse seine fishery: Optimum number report. Juneau, Alaska (8800 Glacier Highway,#109, Juneau 99801): Commercial Fisheries Entry Commission, 1992.
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Implementation of the ecosystem approach to fisheries for the purse seine fisheries in Lebanon. FAO, 2020. http://dx.doi.org/10.4060/ca7533en.
10
Incidence of immature chinook in the 1990 all-citizen commercial purse seine fishery for chum salmon in Hood Canal. Olympia, WA: State of Washington, Dept. of Fisheries, Planning, Research & Harvest Management Program, 1991.
Book chapters on the topic "Purse seine fisheries":
1
Airaud, Manon, Laurent Tezenas, Gala Moreno, Laurent Dagorn, and Jefferson Murua. "Action Research in Tropical Tuna Purse Seine Fisheries: Thoughts and Perspectives." In Collaborative Research in Fisheries, 193–212. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-26784-1_12.
2
Marçalo, Ana, Mike Breen, Maria Tenningen, Iñigo Onandia, Luis Arregi, and Jorge M. S. Gonçalves. "Mitigating Slipping-Related Mortality from Purse Seine Fisheries for Small Pelagic Fish: Case Studies from European Atlantic Waters." In The European Landing Obligation, 297–318. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03308-8_15.
3
Carboni, Donatella, Giovanni Messina, Vittorio Gazale, and Ester Tarricone. "Fishing and territory. Status and perspectives of Sardinia artisanal fisheries. The case of traditional fishery in Asinara Island MPA." In Ninth International Symposium “Monitoring of Mediterranean Coastal Areas: Problems and Measurement Techniques”, 175–86. Florence: Firenze University Press, 2022. http://dx.doi.org/10.36253/979-12-215-0030-1.16.
Abstract:
This study outlines small-scale fishing Sardinia through specificities related to the state of the fishing fleet at the major and minor port systems of the island, the main techniques, and tools (fixed longlines, bottom trawls, purse seines, casting nets, driftnets). Mapping fishing areas in the Marine Protected Area of Asinara Island was important to define efficient fisheries management measures shared by stakeholders. Therefore, the work focused on the mapping of fishing areas in MPA, its techniques and tools.This work is a premise for future and more applicative lines of research
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Wadiwel, Dinesh Joseph. "Resistance." In Animals and Capital, 161–91. Edinburgh University Press, 2023. http://dx.doi.org/10.3366/edinburgh/9781399518062.003.0006.
Abstract:
This book charts the confrontation that animals experience in relation to capitalist industrial agriculture. This is often a battle between fixed capital (machines, enclosures, instruments) and animals who are compelled by this machinery. It is thus resistance that is the central marker of animal agency in the face of capital. This Chapter looks at the case study of industrialised fisheries, exploring how resistance might be conceptualised, and the ways this resistance can be read against deployments of fixed capital. Examining the fish hook, the purse seine net and aquaculture, these technologies of capture reveal the parasitic relation at the centre of capital’s orientation to these beings, which seeks continually to subdue these animals in order to suck value. But, a focus on resistance is also useful as it reminds us that animals are co-co-producers of the world we see, and thus point us towards the potential productivity of a re-imagined world without this violence.
Conference papers on the topic "Purse seine fisheries":
1
Oliveira, A., N. Fonseca, and C. Guedes Soares. "Design of A Modern Purse Seiner Fishing Vessel For The Portuguese Coastal Sea." In Fishing Vessels, Fishing Technology & Fisheries. RINA, 2005. http://dx.doi.org/10.3940/rina.fiso.2005.11.
2
Belenky, Vadim, Shiro Suzuki, and Yasuyuki Yamakoshi. "Experimental Study on Nonlinear Rolling in Irregular Beam Seas." In SNAME 26th American Towing Tank Conference. SNAME, 2001. http://dx.doi.org/10.5957/attc-2001-030.
Abstract:
The model test was aimed at the validation of practical non-ergodicity ( correct math term is cyclic non-stationary quality). It means that the ergodic hypothesis cannot be used for any practical calculation of nonlinear irregular rolling. In other words, all the probabilistic characteristics have to be averaged over a representative ensemble of realizations and any result based on one realization is not correct. This was first started on the base of numerical simulations. The model experiment was carried out in the towing tank of the National Research Institute of Fisheries Engineering in Japan. There were two series of tests with two models. The first series of tests was done with free-drifting model of a Japanese purse seiner. Such a test yields about 10 minutes of realization. Since the absence of ergodic qualities can be checked only on a significant amount of time, the second series of tests was conducted with a restrained model that was not able to drift. The second series produced 30 and 40 minutes realizations of model time that is close to a quasi-stationary range of full-scale waves. It was meant that the first series can be used for validation of the second one. The paper is focused on model test technique.