TY - JOUR T1 - Beyond Post-release Mortality: Inferences on Recovery Periods and Natural Mortality From Electronic Tagging Data for Discarded Lamnid Sharks A1 - Bowlby,Heather D. A1 - Benoît,Hugues P. A1 - Joyce,Warren A1 - Sulikowski,James A1 - Coelho,Rui A1 - Domingo,Andrés A1 - Cortés,Enric A1 - Hazin,Fabio A1 - Macias,David A1 - Biais,Gerard A1 - Santos,Catarina A1 - Anderson,Brooke AD - Bedford Institute of Oceanography, Fisheries and Oceans Canada, Dartmouth, NS, Canada AD - Institut Maurice-Lamontagne, Fisheries and Oceans Canada, Mont-Joli, QC, Canada AD - School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ, United States AD - Portuguese Institute for the Ocean and Atmosphere (IPMA, I.P.), Olhão, Portugal AD - Centre of Marine Sciences of the Algarve (CCMAR), University of Algarve, Faro, Portugal AD - Laboratorio de Recursos Pelágicos, Dirección Nacional de Recursos Acuáticos, Montevideo, Uruguay AD - Panama City Laboratory, NOAA Fisheries, Southeast Fisheries Science Center, Panama, FL, United States AD - Department of Fishing and Aquaculture, Universidade Federal Rural de Pernambuco, Recife, Brazil AD - Oceanographic Center of Malaga, Spanish Institute of Oceanography, Málaga, Spain AD - Ifremer, Laboratoire LIENSs, Université de La Rochelle, Nantes, France AD - Ifremer, Laboratoire LIENSs, Université de La Rochelle, Nantes, France UR - https://archimer.ifremer.fr/doc/00688/80020/ DO - 10.3389/fmars.2021.619190 KW - Natural mortality KW - recovery period KW - lamnid sharks KW - Atlantic KW - survival KW - mitigation KW - bycatch N2 - 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 deployments of archival satellite tags, we inferred mortality events, characterized physiological recovery periods following release, and applied survival mixture models to assess M and PRM. We also evaluated covariate effects on the duration of any recovery period and PRM to inform mitigation. Although large sample sizes involving extended monitoring periods (>90 days) would be optimal to directly estimate M from survival data, it was possible to constrain estimates and infer probable values for both species. Furthermore, the consistency of M estimates with values derived from longevity information suggests that age determination is relatively accurate for these species. Regarding bycatch mitigation, our analyses suggest that juvenile porbeagle are more susceptible to harm during capture and handling, that keeping lamnid sharks in the water during release is optimal, and that circle hooks are associated with longer recovery periods for shortfin mako. Y1 - 2021/04 PB - Frontiers Media SA JF - Frontiers In Marine Science SN - 2296-7745 VL - 8 ID - 80020 ER -