Stock assessment of the western winter-spring cohort of <em>Ommastrephes bartramii</em> in the Northwest Pacific Ocean using a Bayesian hierarchical DeLury model based on daily natural mortality during 2005-2015

Qi Ding; Jie Cao; Xinjun Chen

doi:10.3989/scimar.04783.10A

Autores/as

Qi Ding College of Marine Sciences, Shanghai Ocean University - Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University https://orcid.org/0000-0001-7181-7059
Jie Cao School of Aquatic and Fisheries Sciences, University of Washington https://orcid.org/0000-0002-9291-9182
Xinjun Chen College of Marine Sciences, Shanghai Ocean University - Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University - National Engineering Research Centre for Oceanic Fisheries, Shanghai Ocean University https://orcid.org/0000-0001-6311-6842

DOI:

https://doi.org/10.3989/scimar.04783.10A

Palabras clave:

Ommastrephes bartramii, mortalidad natural diaria, modelo jerárquico bayesiano DeLury, evaluación de stock, océano Pacífico noroeste

Resumen

El propósito de este estudio es evaluar el efecto de la pesca comercial con potera automática sobre la cohorte occidental de invierno-primavera de la pota saltadora (Ommastrephes bartramii) en el océano Pacífico noroeste y estimar el estado de explotación de esta población durante los años 2005-2015. Se utilizó un modelo de DeLury jerárquico bayesiano para estudiar la pesca con potera automática de la flota china. Para estimar la abundancia y capturabilidad del stock para cada año se analizó la mortalidad natural diaria (M). Los resultados indicaron que los valores de M tuvieron un gran impacto en las estimaciones generales del tamaño del stock. El tamaño inicial de la población anual varió entre 66 y 662 millones de ejemplares con el valor M de 0.003-0.01 por día durante 2005-2015. O. bartramii mostró un cierto grado de sobreexplotación en 2008. La proporción de la población preservada de la pesca (M=0.003-0.01) fue de 8.94-19.82% en 2008, siendo en promedio de 13.74%, lo que pudo conducir a una reducida abundancia y captura anual de O. bartramii desde 2009. Como especie oportunista de vida breve, O. bartramii es extremadamente sensible a los cambios en las condiciones ambientales, especialmente cuando aparecen condiciones ambientales anómalas. Variaciones interanuales significativas en su abundancia mostraron que O. bartramii sufrió un cierto grado de sobreexplotación durante algunos años, como por ejemplo durante 2010. Aunque la proporción de la población preservada de la pesca cumplió con el objetivo de su gestión pesquera del 40% durante los años 2011-2015, el tamaño del stock y la captura anual oscilaron entre niveles relativamente bajos. La mejora en el conocimiento de cómo las condiciones ambientales influyen en la abundancia de la cohorte occidental de invierno-primavera de la pota saltadora puede contribuir al manejo sostenible de este stock.

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Citas

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