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| Registros recuperados: 21 | |
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| Travassos Tolotti, Mariana; Filmalter, John David; Bach, Pascal; Travassos, Paulo; Seret, Bernard; Dagorn, Laurent. |
| Recently, declining populations of several pelagic shark species have led to global conservation concerns surrounding this group. As a result, a series of species-specific banning measures have been implemented by Regional Fishery Management Organizations (RFMOs) in charge of tuna fisheries, which include retention bans, finning bans and trading bans. There are both positive and negative aspects to most management measures, but generally, the positive aspects outweigh the negatives, ensuring the measure is beneficial to the resource and its users in the long term. Banning measures are a good first step towards the conservation of pelagic shark species, especially since they improve conservation awareness among fishers, managers and the public. Measures... |
| Tipo: Text |
Palavras-chave: Bycatch; Conservation; Fin trade; Pelagic shark; Tuna fisheries. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00626/73842/73726.pdf |
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| Gilman, Eric; Chaloupka, Milani; Bach, Pascal; Fennell, Hannah; Hall, Martin; Musyl, Michael; Piovano, Susanna; Poisson, Francois; Song, Liming. |
| Fisheries can profoundly affect bycatch species with ‘slow’ life history traits. Managing bait type offers one tool to control species selectivity. Different species and sizes of marine predators have different prey, and hence bait, preferences. This preference is a function of a bait’s chemical, visual, acoustic and textural characteristics and size, and for seabirds the effect on hook sink rate is also important. We conducted a global meta-analysis of existing estimates of the relative risk of capture on different pelagic longline baits. We applied a Bayesian random effects meta-analytic regression modelling approach to estimate overall expected bait-specific catch rates. For blue shark and marine turtles, there were 34% (95% HDI: 4–59%) and 60% (95%... |
| Tipo: Text |
Palavras-chave: Bait; Bycatch; Longline; Mitigation; Selectivity; Tuna. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00643/75536/76441.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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| Murua, Hilario; Santos, M. N.; Chavance, Pierre; Amande, J; Abascal, Francisco J.; Ariz, Javier; Bach, Pascal; Korta, M; Poisson, Francois; Coelho, R; Seret, Bernard. |
| The objective of this project was to obtain scientific advice for the purpose of implementing the EUPOA on sharks as regards the facilitation of monitoring fisheries and shark stock assessment on a species-specific level in the high seas. The study was focused on major elasmobranch species caught by both artisanal and industrial large pelagic fisheries on the High Seas of the Atlantic, Indian and Pacific area, which are currently monitored and potentially managed by respective Tuna RFMOs. Estimated “potential” shark species catch in the Indian Ocean is around 160,000 t for 22,000 t. presently declared (7 times higher than declared). Considering all sharks that are not reported at species level, the total amount of shark declared was around 100,000 tons... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00160/27160/25359.pdf |
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| Tolotti, Mariana; Bauer, Robert; Forget, Fabien; Bach, Pascal; Dagorn, Laurent; Travassos, Paulo. |
| Time series of depth data, obtained for 6 oceanic whitetip sharks (Carcharhinus longimanus) tagged with pop-up satellite archival tags, were analyzed in detail. The aim was to improve our knowledge of the vertical behavior of this species. Individuals were tagged in the Atlantic Ocean (n=5) and Indian Ocean (n=1) between 2011 and 2012. Deployment periods for these tags varied from 100 to 178 d. The sharks spent most of their time in the mixed layer, displaying the typical behavior of an epipelagic species. However, analyses revealed complex vertical movement patterns, including marked diel changes that reflect 3 different types of behavior. Results of the generalized additive models indicate that vertical movements were strongly correlated with variations... |
| Tipo: Text |
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| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00625/73734/74664.pdf |
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| Marsac, Francis; Chassot, Emmanuel; Cauquil, Pascal; Chavance, Pierre; Clot, Thierry; Bach, Pascal; Bourjea, Jerome; Bodin, Natalie. |
| Depuis le passage de Mayotte comme territoire sous régime communautaire, l’outre-mer français tropical de l’océan Indien ne concerne plus que les îles Eparses qui sont rattachées à l’administration supérieure des Terres Australes et Antarctiques françaises (TAAF). Un parc naturel marin a été créé le 22 février 2012 (décret n°2012-245), il s’agit du PNM des Glorieuses, qui dépend des îles Eparses et s’étend sur l’ensemble de la ZEE des Glorieuses. Les Iles Eparses sont inhabitées et ne disposent pas de flottilles thonières immatriculées à France-Territoires. Néanmoins, les TAAF délivrent des licences de pêche à des palangriers et senneurs français et étrangers souhaitant pêcher dans les eaux françaises, et un programme observateur accompagne l’octroi de ces... |
| Tipo: Text |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00308/41896/41162.pdf |
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| Queiroz, Nuno; Humphries, Nicolas E.; Couto, Ana; Vedor, Marisa; Da Costa, Ivo; Sequeira, Ana M. M.; Mucientes, Gonzalo; Santos, Antonio M; Abascal, Francisco J.; Abercrombie, Debra L.; Abrantes, Katya; Acuna-marrero, David; Afonso, Andre S.; Afonso, Pedro; Anders, Darrell; Araujo, Gonzalo; Arauz, Randall; Bach, Pascal; Barnett, Adam; Bernal, Diego; Berumen, Michael L.; Lion, Sandra Bessudo; Bezerra, Natalia P. A.; Blaison, Antonin V.; Block, Barbara A.; Bond, Mark E.; Bonfil, Ramon; Bradford, Russell W.; Braun, Camrin D.; Brooks, Edward J.; Brooks, Annabelle; Brown, Judith; Bruce, Barry D.; Byrne, Michael E.; Campana, Steven E.; Carlisle, Aaron B.; Chapman, Demian D.; Chapple, Taylor K.; Chisholm, John; Clarke, Christopher R.; Clua, Eric G.; Cochran, Jesse E. M.; Crochelet, Estelle C.; Dagorn, Laurent; Daly, Ryan; Cortes, Daniel Devia; Doyle, Thomas K.; Drew, Michael; Duffy, Clinton A. J.; Erikson, Thor; Espinoza, Eduardo; Ferreira, Luciana C.; Ferretti, Francesco; Filmalter, John D.; Fischer, G. Chris; Fitzpatrick, Richard; Fontes, Jorge; Forget, Fabien; Fowler, Mark; Francis, Malcolm P.; Gallagher, Austin J.; Gennari, Enrico; Goldsworthy, Simon D.; Gollock, Matthew J.; Green, Jonathan R.; Gustafson, Johan A.; Guttridge, Tristan L.; Guzman, Hector M.; Hammerschlag, Neil; Harman, Luke; Hazin, Fabio H. V.; Heard, Matthew; Hearn, Alex R.; Holdsworth, John C.; Holmes, Bonnie J.; Howey, Lucy A.; Hoyos, Mauricio; Hueter, Robert E.; Hussey, Nigel E.; Huveneers, Charlie; Irion, Dylan T.; Jacoby, David M. P.; Jewell, Oliver J. D.; Johnson, Ryan; Jordan, Lance K. B.; Jorgensen, Salvador J.; Joyce, Warren; Daly, Clare A. Keating; Ketchum, James T.; Klimley, A. Peter; Kock, Alison A.; Koen, Pieter; Ladino, Felipe; Lana, Fernanda O.; Lea, James S. E.; Llewellyn, Fiona; Lyon, Warrick S.; Macdonnell, Anna; Macena, Bruno C. L.; Marshall, Heather; Mcallister, Jaime D.; Mcauley, Rory; Meyer, Michael A.; Morris, John J.; Nelson, Emily R.; Papastamatiou, Yannis P.; Patterson, Toby A.; Penaherrera-palma, Cesar; Pepperell, Julian G.; Pierce, Simon J.; Poisson, Francois; Quintero, Lina Maria; Richardson, Andrew J.; Rogers, Paul J.; Rohner, Christoph A.; Rowat, David R. L.; Samoilys, Melita; Semmens, Jayson M.; Sheaves, Marcus; Shillinger, George; Shivji, Mahmood; Singh, Sarika; Skomal, Gregory B.; Smale, Malcolm J.; Snyders, Laurenne B.; Soler, German; Soria, Marc; Stehfest, Kilian M.; Stevens, John D.; Thorrold, Simon R.; Tolotti, Mariana T.; Towner, Alison; Travassos, Paulo; Tyminski, John P.; Vandeperre, Frederic; Vaudo, Jeremy J.; Watanabe, Yuuki Y.; Weber, Sam B.; Wetherbee, Bradley M.; White, Timothy D.; Williams, Sean; Zarate, Patricia M.; Harcourt, Robert; Hays, Graeme C.; Meekan, Mark G.; Thums, Michele; Irigoien, Xabier; Eguiluz, Victor M.; Duarte, Carlos M.; Sousa, Lara L.; Simpson, Samantha J.; Southall, Emily J.; Sims, David W.. |
| Effective ocean management and the conservation of highly migratory species depend on resolving the overlap between animal movements and distributions, and fishing effort. However, this information is lacking at a global scale. Here we show, using a big-data approach that combines satellite-tracked movements of pelagic sharks and global fishing fleets, that 24% of the mean monthly space used by sharks falls under the footprint of pelagic longline fisheries. Space-use hotspots of commercially valuable sharks and of internationally protected species had the highest overlap with longlines (up to 76% and 64%, respectively), and were also associated with significant increases in fishing effort. We conclude that pelagic sharks have limited spatial refuge from... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00575/68662/67587.pdf |
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| Bertrand, Arnaud; Josse, Erwan; Bach, Pascal; Gros, Philippe; Dagorn, Laurent. |
| We studied relationships between tropical tunas (albacore (Thunnus alalunga), bigeye (Thunnus obesus), and yellowfin (Thunnus albacares)) and their biotic and abiotic environments through simultaneous acoustic observations of tunas and their prey, experimental longline catch, and oceanographic data in French Polynesia. Vertical habitat limits were estimated based on temperature and dissolved oxygen at capture data. We then studied tuna-micronekton relationships to better understand how tuna occupy the pelagic space, At a regional scale, tunas were more abundant in areas rich in prey with favourable hydrological conditions. Inside such areas, at the scale of a longline set, however, the longline catches were maximal only when prey were not distributed in... |
| Tipo: Text |
Palavras-chave: Hydrological; Acoustic observations; Tunas. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/publication-733.pdf |
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| Dhellemmes, F.; Hansen, M. J.; Bouet, S. D.; Videler, J. J.; Domenici, P.; Steffensen, J. F.; Hildebrandt, T.; Fritsch, G.; Bach, Pascal; Sabarros, Philippe; Krüger, A.; Kurvers, R. H. J. M.; Krause, J.. |
| Billfishes are well known for their distinctive elongated rostra, i.e. bills. The functional significance of billfish rostra has been frequently discussed and the recent discovery of an oil gland (glandula oleofera) at the base of the rostrum in swordfish, Xiphias gladius, has added an interesting facet to this discussion regarding the potential co-evolution of gland and rostra. Here, we investigated the oil gland and oil pores (through which the oil is brought to the skin surface) of four billfish species – swordfish, Atlantic blue marlin (Makaira nigricans), Indo-Pacific sailfish (Istiophorus platypterus) and striped marlin (Kajikia audax) – and provide detailed evidence for the presence of an oil gland in the last three. All four species had a high... |
| Tipo: Text |
Palavras-chave: Comparative method; Functional morphology; Rostrum; Glandula oleofera; Rete lubricans; Fatty acids; Co-evolution. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00656/76805/77973.pdf |
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| Mannocci, Laura; Forget, Fabien; Travassos Tolotti, Mariana; Bach, Pascal; Bez, Nicolas; Demarcq, Herve; Kaplan, David; Sabarros, Philippe; Simier, Monique; Capello, Manuela; Dagorn, Laurent. |
| Fisheries observer programs represent the most reliable way to collect data on fisheries bycatch. However, their limited coverage leads to important data gaps that preclude bycatch mitigation at the basin scale. Habitat models developed from available fisheries observer programs offer a potential solution to fill these data gaps. We focus on tropical tuna purse seine fisheries (TTPSF) that span across the tropics and extensively rely on floating objects (FOBs) for catching tuna schools, leading to the bycatch of other species associated with these objects. Bycatch under floating objects is dominated by five species, including the vulnerable silky shark Carcharhinus falciformis and four bony fishes (oceanic triggerfish Canthidermis maculata, rainbow runner... |
| Tipo: Text |
Palavras-chave: Bycatch; Habitat modelling; Hotspots; Fisheries observer programs; Geographical extrapolation; Tropical oceans. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00662/77385/78986.pdf |
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| Murua, Hilario; Abascal, Francisco J.; Amande, J; Ariz, P; Bach, Pascal; Chavance, Pierre; Coelho, R; Korta, M; Poisson, Francois; Santos, M. N.; Seret, Bernard. |
| The scope of the European Union Plan of Action for Sharks covers directed commercial, by-catch commercial, directed recreational, and by-catch recreational fishing of any chondrichthyans within European Union waters. It also includes any fisheries covered by current and potential agreements and partnerships between the European Union and third countries, as well as fisheries in the high seas and fisheries covered by RFMOs managing or issuing non-binding recommendations outside European Union waters. Scientific advice for the purpose of the management of shark species in the high seas is carried out mainly via the Scientific Committees of the relevant Regional Fisheries Management Organisations (RFMO), as well as through specific projects by national... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00160/27111/25298.pdf |
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| Floch, Laurent; Depetris, Mathieu; Dewals, Patrice; Duparc, Antoine; Kaplan, David; Lebranchu, Julien; Marsac, Francis; Pernak, Marianne; Bach, Pascal. |
| In 2018, a total of 14 French vessels operated in the eastern Indian Ocean including 12 purse seiners and 2 supplies. The total capacity weighted by the months of activity for each vessel is 11686t. The total nominal effort in 2018 was of 2885 fishing days and 2723 sets with 2463 sets on floating objects and 260 on free schools. In 2018, the percentage of sets on FOB was 90% and the catches reached 91%. The total catch of the French component of the EU purse seine fleet of the Indian Ocean was 84,729 t, being composed of 36%, 58%, and 6% of yellowfin tuna, skipjack tuna, and bigeye tuna respectively. Thus, the most noticeable change in 2018 is the shift of catches from the free school sets, dominated by yellowfin, to the associated school sets, dominated... |
| Tipo: Text |
Palavras-chave: Tropical tuna fisheries; French purse seining; Free swimming school; Fish aggregating devices; Katsuwonus pelamis; Thunnus albacares; Thunnus obesus. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00590/70259/68318.pdf |
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| Kaplan, David; Bach, Pascal; Bonhommeau, Sylvain; Chassot, Emmanuel; Chavance, Pierre; Dagorn, Laurent; Davies, Tim; Dueri, Sibylle; Fletcher, Rick; Fonteneau, Alain; Fromentin, Jean-marc; Gaertner, Daniel; Hampton, John; Hilborn, Ray; Hobday, Alistair; Kearney, Robert; Kleiber, Pierre; Lehodey, Patrick; Marsac, Francis; Maury, Olivier; Mees, Chris; Menard, Frederic; Pearce, John; Sibert, John. |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00139/25068/23186.pdf |
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| Rabearisoa, Njaratiana; Sabarros, Philippe S.; Romanov, Evgeny V.; Lucas, Vincent; Bach, Pascal. |
| Depredation in marine ecosystems is defined as the damage or removal of fish or bait from fishing gear by predators. Depredation raises concerns about the conservation of species involved, fisheries yield and profitability, and reference points based on stock assessment of depredated species. Therefore, the development of accurate indicators to assess the impact of depredation is needed. Both the Reunion Island and the Seychelles archipelago pelagic longline fisheries targeting swordfish (Xiphias gladius) and tuna (Thunnus spp.) are affected by depredation from toothed whales and pelagic sharks. In this study, we used fishery data collected between 2004 and 2015 to propose depredation indicators and to assess depredation levels in both fisheries. For both... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00454/56571/75149.pdf |
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| Chavance, Pierre; Chassot, Emmanuel; Bourjea, Jerome; Evano, Hugues; Nadeau, Aurelie; Bach, Pascal; Marsac, Francis; Dagorn, Laurent. |
| Pour ce qui concerne la France, trois flottilles ont des activités de pêche thonière dans l'Océan Indien : - les senneurs opérant pour l’essentiel à partir des Seychelles, - les palangriers basés à La Réunion, et à un moindre degré la petite pêche réunionnaise. La flottille thonière française à la senne exerçant dans l’océan Indien atteint 8 navires en 2011 et ses capture se sont élevées à 42 900 tonnes, soit un niveau sensiblement inférieur à celui de 2010 (47 000 t) malgré une stabilité de l’effort de pêche (2 109 jours de pêche en 2011 et 2 132 jours en 2010). Le programme observateur mis en place depuis 2005, qui a permis de fournir les premières évaluations des rejets et des prises accessoires en 2008, a du être stoppé mi 2009 pour raison de sécurité,... |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00109/21983/19599.pdf |
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| Bach, Pascal; Chassot, Emmanuel; Bourjea, Jerome; Evano, Hugues; Huet, Jerome; Chavance, Pierre; Floch, I; Cauquil, Pascal; Sabarros, Phillipe; Giannasi, P; Marsac, Francis. |
| Pour ce qui concerne la France en incluant dorénavant le département de Mayotte, rattaché à la flotte de l’UE depuis le 1er janvier 2014, cinq flottilles ont des activités de pêche thonière dans l'océan Indien : - les senneurs opérant pour l’essentiel à partir des Seychelles et de l’Ile Maurice, - les palangriers basés à La Réunion, les palangriers basés à Mayotte, et à un moindre degré les pêches artisanales réunionnaise - La flottille thonière française à la senne exerçant dans l’océan Indien atteint 13 navires en 2014 et ses capture se sont élevées à 58 421 tonnes, soit un niveau largement supérieur à celui de 2013 (39958 t) en lien avec une augmentation de l’effort de pêche de 2 291 jours de pêche en 2013 à 3756 jours en 2014. Le programme... |
| Tipo: Text |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00308/41893/41160.pdf |
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| Chavance, Pierre; Chassot, Emmanuel; Bourjea, Jerome; Evano, Hugues; Nadeau, Aurelie; Bach, Pascal; Marsac, Francis; Dagorn, Laurent. |
| Pour ce qui concerne la France (excluant Mayotte), trois flottilles ont des activités de pêche thonière dans l'Océan Indien : (1) les senneurs opérant pour l’essentiel à partir des Seychelles et de l’Ile Maurice, - les palangriers basés à La Réunion, et à un moindre degré la petite pêche réunionnaise. La flottille thonière française à la senne exerçant dans l’océan Indien atteint 10 navires en 2012 et ses capture se sont élevées à 37 155 tonnes, soit un niveau sensiblement inférieur à celui de 2011 (42 894 t) avec une légère diminution de l’effort de pêche (1 944 jours de pêche en 2012 et 2 109 jours en 2011). Le programme observateur mis en place depuis 2005, qui a permis de fournir les premières évaluations des rejets et des prises accessoires en 2008, a... |
| Tipo: Text |
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| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00166/27716/25909.pdf |
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| Chavance, Pierre; Chassot, Emmanuel; Bourjea, Jerome; Evano, Hugues; Huet, Jerome; Bach, Pascal; Sabarros, Philippe. |
| Pour ce qui concerne la France (excluant Mayotte), trois flottilles ont des activités de pêche thonière dans l'océan Indien : - les senneurs opérant pour l’essentiel à partir des Seychelles et de l’Ile Maurice, - les palangriers basés à La Réunion, et à un moindre degré la petite pêche réunionnaise. - La flottille thonière française à la senne exerçant dans l’océan Indien atteint 8 navires en 2013 et ses capture se sont élevées à 39 958 tonnes, soit un niveau légèrement supérieur à celui de 2012 (37 155 t) avec une légère augmentation de l’effort de pêche (2 291 jours de pêche en 2013 et 1 944 jours en 2012). Le programme observateur mis en place depuis 2005, qui a permis de fournir les premières évaluations des rejets et des prises accessoires en 2008, a... |
| Tipo: Text |
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| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00239/35015/33552.pdf |
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| Registros recuperados: 21 | |
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