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J. Mar. Sci. Eng. 2018, 6(4), 157; https://doi.org/10.3390/jmse6040157

Towards Age Determination of Southern King Crab (Lithodes santolla) Off Southern Chile Using Flexible Mixture Modeling

1
Instituto de Estadística, Universidad de Valparaíso, Valparaíso 2360102, Chile
2
Telefónica I+D, Compañía de Telecomunicaciones de Chile S.A., Santiago 7501105, Chile
3
Departamento de Evaluación de Recursos, Instituto de Fomento Pesquero, Valparaíso 2361827, Chile
*
Author to whom correspondence should be addressed.
Received: 30 October 2018 / Revised: 11 December 2018 / Accepted: 12 December 2018 / Published: 14 December 2018
(This article belongs to the Section Marine Biology)
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Abstract

This study addresses the problem of age determination of the southern king crab (Lithodes santolla). Given that recapture is difficult for this species and, thus, age cannot be directly determined with the help of the annual marks on the shell, the von Bertalanffy growth function (vBGF) cannot be used to directly model length-frequency data (LFD). To determine age classes, some researchers have proposed using the MIX algorithm that consists of sampling realization of a finite mixture of normal (FMN) distributions for each LFD. However, normality assumption in age-length data has been questioned in several works related to fish growth analysis. For this study, we considered the biological information of the southern king crab for the period 2007–2015 and localization between 50 06 53 15 S and 76 36 72 18 W. We assumed that LFD could be modelled by the novel class of finite mixture of skew-t (FMST). Assigned age classes were used to estimate the vBGF parameters. The estimated vBGF parameters were L = 176.756 cm, K = 0.151 year 1 , t 0 = 1.678 year for males, and L = 134.799 cm, K = 0.220 year 1 , t 0 = 1.302 year for females. This study concludes that (a) FMST modal decomposition can detect a group of younger individuals at age 2, given that those individuals have LFD with a left heavy-tail and asymmetry; (b) FMST produces a better representation of LFD than the FMN model; (c) males have bigger L but grow slower than females; and (d) as expected, a high correlation exists among the vBGF estimates. View Full-Text
Keywords: finite mixture; skew-t distribution; southern king crab; length-frequency data; von Bertalanffy finite mixture; skew-t distribution; southern king crab; length-frequency data; von Bertalanffy
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Contreras-Reyes, J.E.; López Quintero, F.O.; Yáñez, A.A. Towards Age Determination of Southern King Crab (Lithodes santolla) Off Southern Chile Using Flexible Mixture Modeling. J. Mar. Sci. Eng. 2018, 6, 157.

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