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| Clermont, Sandra; Chavance, Pierre; Delgado De Molina, Alicia; Murua, Hilario; Ruiz, Jon; Ciccione, Stephane; Bourjea, Jerome. |
| Bycatch of marine turtles, vulnerable or endangered species, is a growing issue of all fisheries, including Oceanic purse-seine fishery. The present paper seeks to assess marine turtle bycatch at a spatial and temporal level in the European purse seine fishery operating in the Atlantic and Indian Oceans. The study was based on data collected through French and Spanish observer programs from 1995 to 2011, a period where more than 230 000 fishing sets were realized by the UE fleets in both Oceans. A total of 15 913 fishing sets were observed, including 6 515 on drifting Fish Aggregate Devices (FAD) and 9 398 on Free Swimming Schools (FSC). Over the study period, 597 turtles were caught, 86% being released alive at sea. At the same time, from 2003 to 2011, 14... |
| Tipo: Text |
Palavras-chave: European tuna fishery; Purse seine; Marine turtle; Bycatch; Atlantic and Indian Oceans. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00149/25991/24087.pdf |
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| Bourjea, Jerome; Clermont, Sandra; Delgado, Alicia; Murua, Hilario; Ruiz, Jon; Ciccione, Stephane; Chavance, Pierre. |
| Bycatch of endangered marine turtles is a growing issue for the management of all fisheries, including the oceanic purse-seine fishery. The aim of this study was to assess the spatial and temporal variation in bycatch rates of these species in the entire European purse-seine fishery operating in the Atlantic and Indian oceans. The study was based on data collected through observer programs from 1995 to 2011. During that period, a total of 15 913 fishing sets were observed, including 6 515 on Drifting Fish Aggregating Devices (DFADs) and 9 398 on free swimming schools, representing a global coverage of 10.3% and 5.1% of the total fishing activity in the Atlantic and Indian Ocean, respectively. Moreover, from 2003 to 2011, 14 124 specific observations were... |
| Tipo: Text |
Palavras-chave: Bycatch; Marine turtle; Fishery impacts; Fishery management; Atlantic Ocean; Indian Ocean. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00206/31760/30632.pdf |
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| Clavareau, Lyndsay; Sabarros, Philippe; Escalle, Lauriane; Bach, Pascal; Abascal, Francisco J.; Lopez, Jon; Murua, Hilario; Pascual Alayon, Pedro J.; Ramos, Maria Lourdes; Ruiz, Jon; Mérigot, Bastien. |
| Despite bycatch of elasmobranch (sharks and rays) being a major concern in most fisheries worldwide, there is a lack of knowledge on their spatio-temporal species distribution, biology (life stage and sex-ratios), as well as their at-haulback mortality rate. Observer data from the French and Spanish tropical purse-seine tuna fisheries operating in the Eastern Atlantic and Western Indian Oceans between 2005 and 2017 were analysed to investigate elasmobranch bycatch. Data included 24 elasmobranchs species and distribution patterns of catch per unit of effort (CPUE) by species and sex-ratio were found to vary with life stages, areas, seasons and fishing modes. In general, higher catches were found in FAD-associated sets (>40%) than free tuna school sets... |
| Tipo: Text |
Palavras-chave: Biodiversity; Spatio-temporal distribution; Life stage; Sex ratio; At-haulback mortality. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00642/75386/76177.pdf |
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| Helmond, Aloysius T.m.; Mortensen, Lars O.; Plet‐hansen, Kristian S.; Ulrich, Clara; Needle, Coby L.; Oesterwind, Daniel; Kindt‐larsen, Lotte; Catchpole, Thomas; Mangi, Stephen; Zimmermann, Christopher; Olesen, Hans Jakob; Bailey, Nick; Bergsson, Heidrikur; Dalskov, Jørgen; Elson, Jon; Hosken, Malo; Peterson, Lisa; Mcelderry, Howard; Ruiz, Jon; Pierre, Johanna P; Dykstra, Claude; Jaap Poos, Jan. |
| Since the beginning of the 21st century, electronic monitoring (EM) has emerged as a cost‐efficient supplement to existing catch monitoring programmes in fisheries. An EM system consists of various activity sensors and cameras positioned on vessels to remotely record fishing activity and catches. The first objective of this review was to describe the state of play of EM in fisheries worldwide and to present the insights gained on this technology based on 100 EM trials and 12 fully implemented programmes. Despite its advantages, and its global use for monitoring, progresses in implementation in some important fishing regions are slow. Within this context, the second objective was to discuss more specifically the European experiences gained through 16... |
| Tipo: Text |
Palavras-chave: Catch documentation; Discard monitoring; Electronic monitoring; Fully documented fisheries; Video-based monitoring. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00591/70331/68384.pdf |
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| Lezama-ochoa, Nerea; Murua, Hilario; Chust, Guillem; Van Loon, Emiel; Ruiz, Jon; Hall, Martin; Chavance, Pierre; De Moline, Alicia Delgado; Villarino, Ernesto. |
| By-catch species from tropical tuna purse seine fishery have been affected by fishery pressures since the last century; however, the habitat distribution and the climate change impacts on these species are poorly known. With the objective of predicting the potential suitable habitat for a shark (Carcharhinus falciformis) and a teleost (Canthidermis maculata) in the Indian, Atlantic and Eastern Pacific Oceans, a MaxEnt species distribution model (SDM) was developed using data collected by observers in tuna purse seiners. The relative percentage of contribution of some environmental variables (depth, sea surface temperature, salinity and primary production) and the potential impact of climate change on species habitat by the end of the century under the A2... |
| Tipo: Text |
Palavras-chave: By-catch; MaxEnt; Silky shark; Rough triggerfish; Habitat suitability; Climate change; Tropical purse seiners; Ecosystem approach to fishery management. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00677/78903/81246.pdf |
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| Hyder, Kieran; Weltersbach, Marc Simon; Armstrong, Mike; Ferter, Keno; Townhill, Bryony; Ahvonen, Anssi; Arlinghaus, Robert; Baikov, Andrei; Bellanger, Manuel; Birzaks, Janis; Borch, Trude; Cambie, Giulia; De Graaf, Martin; Diogo, Hugo M. C.; Dziemian, Lukasz; Gordoa, Ana; Grzebielec, Ryszard; Hartill, Bruce; Kagervall, Anders; Kapiris, Kostas; Karlsson, Martin; Kleiven, Alf Ring; Lejk, Adam M.; Levrel, Harold; Lovell, Sabrina; Lyle, Jeremy; Moilanen, Pentti; Monkman, Graham; Morales-nin, Beatriz; Mugerza, Estanis; Martinez, Roi; O'Reilly, Paul; Olesen, Hans Jakob; Papadopoulos, Anastasios; Pita, Pablo; Radford, Zachary; Radtke, Krzysztof; Roche, William; Rocklin, Delphine; Ruiz, Jon; Scougal, Callum; Silvestri, Roberto; Skov, Christian; Steinback, Scott; Sundelof, Andreas; Svagzdys, Arvydas; Turnbull, David; Van Der Hammen, Tessa; Van Voorhees, David; Van Winsen, Frankwin; Verleye, Thomas; Veiga, Pedro; Volstad, Jon-helge; Zarauz, Lucia; Zolubas, Tomas; Strehlow, Harry V.. |
| Marine recreational fishing (MRF) is a high-participation activity with large economic value and social benefits globally, and it impacts on some fish stocks. Although reporting MRF catches is a European Union legislative requirement, estimates are only available for some countries. Here, data on numbers of fishers, participation rates, days fished, expenditures, and catches of two widely targeted species were synthesized to provide European estimates of MRF and placed in the global context. Uncertainty assessment was not possible due to incomplete knowledge of error distributions; instead, a semi-quantitative bias assessment was made. There were an estimated 8.7 million European recreational sea fishers corresponding to a participation rate of 1.6%. An... |
| Tipo: Text |
Palavras-chave: European marine recreational fisheries; Fisheries assessment and management; Fishing effort and expenditure; Participation; Surveys and monitoring of marine recreational fisheries. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00410/52136/52846.pdf |
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