Environmental influences on commercial oceanic ommastrephid squids: a stock assessment perspective

Jintao Wang; Xinjun Chen; Kisei Tanaka; Jie Cao; Yong Chen

doi:10.3989/scimar.04497.25B

Autores/as

Jintao Wang College of Marine Sciences, Shanghai Ocean University - School of Marine Sciences, University of Maine https://orcid.org/0000-0003-3332-1209
Xinjun Chen College of Marine Sciences, Shanghai Ocean University - Collaborative Innovation Centre for Distant-water Fisheries - National Engineering Research Centre for Oceanic Fisheries - Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University https://orcid.org/0000-0003-2529-0852
Kisei Tanaka School of Marine Sciences, University of Maine https://orcid.org/0000-0002-1901-6972
Jie Cao School of Marine Sciences, University of Maine https://orcid.org/0000-0002-9291-9182
Yong Chen School of Marine Sciences, University of Maine - Collaborative Innovation Centre for Distant-water Fisheries https://orcid.org/0000-0003-0655-3864

DOI:

https://doi.org/10.3989/scimar.04497.25B

Palabras clave:

potas (familia Ommastrephidae), Ommastrephes bartramii, Illex argentinus, Dosidicus gigas, gestión de stocks, factores medioambientales

Resumen

Los miembros de la familia Ommastrephidae (potas) son cefalópodos de vida breve y oportunistas ecológicos, estando sus reclutamientos profundamente influidos por el ambiente circundante. Aunque algunos estudios recientes sugirieron que la variabilidad del reclutamiento en varias especies de esta familia podría explicarse parcialmente por la variabilidad ambiental derivada de datos oceanográficos sinópticos, la gestión de los stocks de omastréfidos empleando factores medioambientales es muy poco frecuente. En el presente trabajo, se ha modificado un modelo de producción generalizada incorporando en él factores ambientales con objeto de ofrecer una herramienta para la gestión y manejo de tres pesquerías: la de Ommastrephes bartramii en el Pacífico Noroeste, la Illex argentinus en el Atlántico sudoeste y la de Dosidicus gigas en el Pacífico sudoeste. Se asumió que los factores ambientales clave: una apropiada temperatura superficial en las áreas de puesta durante las épocas de freza y en las áreas de alimentación durante las estaciones de nutrición, tenían efectos sobre la capacidad de carga y el crecimiento instantáneo de la tasa de crecimiento de la población, respectivamente, en el modelo de producción generalizada. Para el stock de cada especie, el modelo de gestión con las variables ambientales mostró el mayor y más preciso ajuste y el menor error cuadrático y coeficiente de variación; además, los puntos de referencia de manejo basados en el modelo optimizado fueron los más precautorios. El presente estudio significa un avance en nuestro conocimiento sobre las interacciones entre el ambiente y la dinámica de las poblaciones de especies de esta familia de cefalópodos, lo que puede mejorar la gestión de estos stocks de especies de vida breve, cuya importancia comercial es muy grande.

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