Post-release survival of silky sharks (Carcharhinus falciformis) following capture by Mexican flag longline fishing vessels in the northeastern Pacific Ocean

Schaefer, Kurt M.; Fuller, Daniel W.; Castillo‐Géniz, José Leonardo; Dreyfus, Michel; Aires-da-Silva, Alexandre

doi:10.1016/j.fishres.2020.105779

Cited by 12 publications

(16 citation statements)

References 27 publications

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“…Therefore, this hotspot in the WCPFC region likely reflects a combination of sharks that were landed as both target catch (Finucci et al, 2019) and bycatch (Griggs et al, 2018). Alternatively, areas of high shark CPUE in the IATTC jurisdiction correspond to high catches of silky sharks off the coast of Mexico, which are likely targeted (Schaefer et al, 2021), and high catches of blue and mako sharks off the coast of Chile, which are likely caught incidentally (Sebastian et al, 2008;Klarian et al, 2018). Areas of high CPUE of blue, shortfin mako, and porbeagle sharks in the ICCAT region (coastal Brazil to Argentina) are also consistent with historical catch reporting in the area (Barreto et al, 2016).…”

Section: Discussionsupporting

confidence: 64%

Global hotspots of shark interactions with industrial longline fisheries

2023

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Sharks are susceptible to industrial longline fishing due to their slow life histories and association with targeted tuna stocks. Identifying fished areas with high shark interaction risk is vital to protect threatened species. We harmonize shark catch records from global tuna Regional Fisheries Management Organizations (tRFMOs) from 2012–2020 and use machine learning to identify where sharks are most threatened by longline fishing. We find shark catch risk hotspots in all ocean basins, with notable high-risk areas off Southwest Africa and in the Eastern Tropical Pacific. These patterns are mostly driven by more common species such as blue sharks, though risk areas for less common, Endangered and Critically Endangered species are also identified. Clear spatial patterns of shark fishing risk identified here can be leveraged to develop spatial management strategies for threatened populations. Our results also highlight the need for coordination in data collection and dissemination by tRFMOs for effective shark management.

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Section: Discussionsupporting

confidence: 64%

Global hotspots of shark interactions with industrial longline fisheries

2023

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“…Musyl et al [ 78 ] reported the post release mortality and vertical movement of five pelagic shark species in the central North Pacific. Musyl and Gilman [ 79 ] and Schaefer et al [ 80 , 81 ] demonstrated the post release mortality of blue shark and silky shark in the Pacific Ocean. Campana et al [ 82 ] and Santos et al [ 83 ] also documented the information of shortfin mako in the Atlantic Ocean.…”

Section: Discussionmentioning

confidence: 99%

Vulnerability Assessment of Pelagic Sharks in the Western North Pacific by Using an Integrated Ecological Risk Assessment

Liu

Huang

et al. 2021

Animals

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The vulnerability of 11 pelagic shark species caught by the Taiwanese coastal and offshore longline fisheries in the western North Pacific were assessed by an ecological risk assessment (ERA) and 10 of the 11 species was assessed by using an integrated ERA developed in this study. The intrinsic rate of population growth was used to estimate the productivity of sharks, and the susceptibility of sharks was estimated by the multiplication of the catchability, selectivity, and post-capture mortality. Three indices namely, the IUCN Red List category, the body weight variation trend, and the inflection point of population growth curve coupled with ERA were used to conduct an integrated ERA. The results indicated that the scalloped hammerhead is at the highest risk (group 1), followed by the silky shark, and the spinner shark at high risk (group 2). The bigeye thresher, and sandbar shark fall in group 3, the smooth hammerhead falls in group 4, and the shortfin mako, pelagic thresher, oceanic whitetip, and dusky shark fall in group 5. Rigorous management measures for the species in groups 1 and 2, setting total allowable catch quota for group 3, and consistent monitoring schemes for groups 4 and 5 are recommended.

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“…Los elasmobranquios, son organismos de crecimiento lento, madurez tardía y baja fecundidad, por lo que, en general, son especies muy vulnerables a la sobreexplotación, como es el caso del tiburón sedoso, C. falciformis (Schaefer et al 2021). A pesar de su amplia importancia ecológica y económica, no existen estudios sobre esta especie en el área de estudio, por lo que el presente trabajo representa el primer registro de la ecología trófica de organismos inmaduros de C. falciformis en el estado de Guerrero, México.…”

Section: Laboratory Workunclassified

“…Elasmobranchs have slow growth, late maturity, and low fertility; therefore, in general, they are species that are highly vulnerable to overexploitation, which is the case of the silky shark, C. falciformis (Schaefer et al 2021). Despite its wide ecological and economic importance, there are no studies on this species in the study area, so this work represents the first record of the trophic ecology of immature organisms of C. falciformis in the state of Guerrero, Mexico.…”

Section: Introductionmentioning

confidence: 99%

Ecología trófica de neonatos y juveniles del tiburón sedoso, Carcharhinus falciformis, frente a la costa de Guerrero, México

et al. 2022

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El tiburón sedoso Carcharhinus falciformis es una de las especies de tiburón más importantes en las capturas de la pesquería de pequeña escala de la costa mexicana del Pacífico. En el presente trabajo reportamos los principales componentes alimentarios de C. falciformis capturados por la flota pesquera de pequeña escala en Acapulco, Guerrero, México, de acuerdo con la talla (neonatos y juveniles) y el sexo (machos y hembras), así como la amplitud de su nicho y nivel trófico. Se recolectaron en total 165 estómagos de C. falciformis, de los cuales 57 presentaron contenido estomacal y 108 se encontraron vacíos. Se identificaron en total 11 componentes alimentarios: 4 crustáceos, 3 peces, 2 cefalópodos, 1 tortuga marina y 1 ave. De acuerdo con el índice de importancia relativa especifica de la presa (%IIREP), el grupo de los crustáceos representó el 77.17% de la dieta. El cangrejo Portunus xantusii fue el componente más importante de la dieta de neonatos, juveniles, machos y hembras. Las dietas entre neonatos y juveniles y entre machos y hembras no presentaron grandes diferencias (índice de Morisita-Horn: 0.86 y 0.80, respectivamente). El tiburón sedoso presentó una amplitud de nicho estrecha en todas las categorías, lo que indicó una estrategia de alimentación de tipo especialista (índice de Levin <0.60). De acuerdo con el modelo de Amundsen, C. falciformis mostró una preferencia por P. xantusii. El nivel trófico determinado para C. falciformis indicó que es un depredador secundario.

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Post-release survival of silky sharks (Carcharhinus falciformis) following capture by Mexican flag longline fishing vessels in the northeastern Pacific Ocean

Cited by 12 publications

References 27 publications

Global hotspots of shark interactions with industrial longline fisheries

Global hotspots of shark interactions with industrial longline fisheries

Vulnerability Assessment of Pelagic Sharks in the Western North Pacific by Using an Integrated Ecological Risk Assessment

Ecología trófica de neonatos y juveniles del tiburón sedoso, Carcharhinus falciformis, frente a la costa de Guerrero, México

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