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| Bowlby, Heather D.; Benoît, Hugues P.; Joyce, Warren; Sulikowski, James; Coelho, Rui; Domingo, Andrés; Cortés, Enric; Hazin, Fabio; Macias, David; Biais, Gerard; Santos, Catarina; Anderson, Brooke. |
| Accurately characterizing the biology of a pelagic shark species is critical when assessing its status and resilience to fishing pressure. Natural mortality (M) is well known to be a key parameter determining productivity and resilience, but also one for which estimates are most uncertain. While M can be inferred from life history, validated direct estimates are extremely rare for sharks. Porbeagle (Lamna nasus) and shortfin mako (Isurus oxyrinchus) are presently overfished in the North Atlantic, but there are no directed fisheries and successful live release of bycatch is believed to have increased. Understanding M, post-release mortality (PRM), and variables that affect mortality are necessary for management and effective bycatch mitigation. From 177... |
| Tipo: Text |
Palavras-chave: Natural mortality; Recovery period; Lamnid sharks; Atlantic; Survival; Mitigation; Bycatch. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00688/80020/83005.pdf |
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| Morfin, Marie; Kopp, Dorothee; Benoît, Hugues P.; Méhault, Sonia. |
| Two vitality index approaches have been demonstrated to be good proxies of discard survival in similar fishing and environmental conditions: Reflex Action Mortality Predictors combined with injuries (RI) scores that measure the proportion of impaired reflexes and injuries, and a simpler, quicker, but less precise approach based on ordinal categories related to fish body movements and injuries (semi-quantitative assessment, SQA). This study assessed and compared these two approaches for five species (two flatfishes, skates, a seabass and a catshark) discarded in a coastal otter trawl fishery in the Bay of Biscay. All species displayed good vitality status according to both indices and were not very sensitive to the fishing nor their biological conditions.... |
| Tipo: Text |
Palavras-chave: Discard survival; Vitality indicators; Reflex Action Mortality Predictor; Bay of Biscay; Coastal otter trawl fishery. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00466/57817/60417.pdf |
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