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Growth, productivity, and relative extinction risk of a data-sparse devil ray

Pardo, Sebastián A [autor/a] | Kindsvater, Holly K [autor/a] | Cuevas Zimbrón, Elizabeth Maestra [autor/a] | Sosa Nishizaki, Óscar [autor/a] | Pérez Jiménez, Juan Carlos [autor/a] | Dulvy, Nicholas K [autor/a].
Tipo de material: Artículo en línea Artículo en línea Tema(s): Mobula japanica | Dinámica de la población | Reproducción de peces | Especies en peligro de extinción | Pesca artesanalTema(s) en inglés: Mobula japanica | Population dynamics | Fishes reproduction | Endangered species | Artisanal fisheriesDescriptor(es) geográficos: Punta Arenas de la Ventana (Baja California Sur, México)Nota de acceso: Acceso en línea sin restricciones En: Scientific Reports. volumen 6, número 33745 (September 2016), páginas 1-10. --ISSN: 2045-2322Número de sistema: 58129Resumen:
Inglés

Devil rays (Mobula spp.) face intensifying fishing pressure to meet the ongoing international demand for gill plates. The paucity of information on growth, mortality, and fishing effort for devil rays make quantifying population growth rates and extinction risk challenging. Furthermore, unlike manta rays (Manta spp.), devil rays have not been listed on CITES. Here, we use a published size-at-age dataset for the Spinetail Devil Ray (Mobula japanica), to estimate somatic growth rates, age at maturity, maximum age, and natural and fishing mortality. We then estimate a plausible distribution of the maximum intrinsic population growth rate (rmax) and compare it to 95 other chondrichthyans. We find evidence that larger devil ray species have low somatic growth rate, low annual reproductive output, and low maximum population growth rates, suggesting they have low productivity. Fishing rates of a small-scale artisanal Mexican fishery were comparable to our estimate of rmax, and therefore probably unsustainable. Devil ray rmax is very similar to that of manta rays, indicating devil rays can potentially be driven to local extinction at low levels of fishing mortality and that a similar degree of protection for both groups is warranted.

Recurso en línea: http://www.nature.com/articles/srep33745
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Acceso en línea sin restricciones

Devil rays (Mobula spp.) face intensifying fishing pressure to meet the ongoing international demand for gill plates. The paucity of information on growth, mortality, and fishing effort for devil rays make quantifying population growth rates and extinction risk challenging. Furthermore, unlike manta rays (Manta spp.), devil rays have not been listed on CITES. Here, we use a published size-at-age dataset for the Spinetail Devil Ray (Mobula japanica), to estimate somatic growth rates, age at maturity, maximum age, and natural and fishing mortality. We then estimate a plausible distribution of the maximum intrinsic population growth rate (rmax) and compare it to 95 other chondrichthyans. We find evidence that larger devil ray species have low somatic growth rate, low annual reproductive output, and low maximum population growth rates, suggesting they have low productivity. Fishing rates of a small-scale artisanal Mexican fishery were comparable to our estimate of rmax, and therefore probably unsustainable. Devil ray rmax is very similar to that of manta rays, indicating devil rays can potentially be driven to local extinction at low levels of fishing mortality and that a similar degree of protection for both groups is warranted. eng

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