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J. Mar. Sci. Eng. 2018, 6(3), 82; https://doi.org/10.3390/jmse6030082

Possible Criterion to Estimate the Juvenile Reference Length of Common Sardine (Strangomera bentincki) off Central-Southern Chile

1
Departamento de Evaluación de Pesquerías, Instituto de Fomento Pesquero, Valparaíso 2361827, Chile
2
Departamento de Evaluación de Recursos, Instituto de Fomento Pesquero, Valparaíso 2361827, Chile
3
Instituto de Estadística, Universidad de Valparaíso, Valparaíso 2360102, Chile
*
Author to whom correspondence should be addressed.
Received: 8 April 2018 / Revised: 28 May 2018 / Accepted: 2 July 2018 / Published: 5 July 2018
(This article belongs to the Section Marine Biology)
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Abstract

In the last century, the growing evidence that global fisheries are depleting natural resources much faster than they can recover has led to negative processes, like overfishing, being addressed with increasingly complex models and thus mitigating or regulating actions that aim to protect stocks. Said negative processes contain two components: (i) they can diminish the reproductive potential of fish stocks, called over exploitation by recruitment, and (ii) the effect of early capture prevents the full realization of the growth potential, called overfishing by growth. In this article, the structure of common sardine sizes is analyzed. Due to the precise moment in which pre-recruits are incorporated into the exploited phase of the stock is unknown, the estimation of a recruitment size is a hard problem. This problem is addressed by modeling the mean size via a stochastic process, applying models of structural change. A time series (2001–2015) was analyzed on a weekly time scale based on the size structure of the pelagic fishery landings in the central-southern zone of Chile (32104014 LS), from the V. to the XIV. Region. Specifically, the evolution of sizes according to macro-zones was studied for the conglomerates identified in two sub-zones, the V.–VIII. and IX.–XIV. Regions. In this context, the reference size for juveniles to cautiously allow the recruitment process of the common sardine from the central-southern zone of Chile was estimated, and the behavior of these sizes was spatially analyzed. Finally, a statistical inferential criterion was established that confirms the mean size of juveniles with a certain margin of error, which allows nonetheless later on to define a fraction that could be protected to avoid overfishing by growth. View Full-Text
Keywords: reference size; common sardine; pelagic fisheries; overfishing; breakpoints reference size; common sardine; pelagic fisheries; overfishing; breakpoints
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Walker, K.; Aranis, A.; Contreras-Reyes, J.E. Possible Criterion to Estimate the Juvenile Reference Length of Common Sardine (Strangomera bentincki) off Central-Southern Chile. J. Mar. Sci. Eng. 2018, 6, 82.

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