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Variability of the growth parameters of the skipjack tuna (Katsuwonus pelamis) among areas in the eastern Atlantic: analysis from tagging data within a meta-analysis approach

Published online by Cambridge University Press:  23 October 2008

Daniel Gaertner ,
Alicia Delgado de Molina ,
Javier Ariz ,
Renaud Pianet  and
Jean Pierre Hallier
Daniel Gaertner
Affiliation:
IRD, UR Thétis, CRH, BP 171, 34203 Sète Cedex, France
Alicia Delgado de Molina
Affiliation:
IEO, Centro Oceanográfico de Canarias, Apdo. de Correos 1373, 38080 Santa Cruz de Tenerife, Islas Canarias, Spain
Javier Ariz
Affiliation:
IEO, Centro Oceanográfico de Canarias, Apdo. de Correos 1373, 38080 Santa Cruz de Tenerife, Islas Canarias, Spain
Renaud Pianet
Affiliation:
IRD, US Osiris, CRH, BP 171, 34203 Sète Cedex, France
Jean Pierre Hallier
Affiliation:
IRD, UR Thetis, and Regional Tuna Tagging Project – Indian Ocean (RTTP-IO), c/o IOTC PO Box 1011, Victoria, Seychelles
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Abstract

In order to assess the latitudinal variability in growth of the eastern Atlantic skipjack (Katsuwonus pelamis), conventional tagging data collected by the International Commission of the Conservation of Atlantic Tunas (ICCAT) since the 1960s are reanalyzed using a modified version of the von Bertalanffy-Fabens growth model. An analysis of the latitudinal patterns of recaptures showed that the lowest mixing rate between northern and southern regions was evidenced at 10° N Latitude. Since it is theoretically admitted that growth parameters L∞ and K are negatively correlated, we substituted L∞ into the growth equation model by a simple bioenergetic function of K fitted from existing studies on skipjack growth parameters. The likelihood for the meta-analysis of growth is combined with the likelihoods from the two regional tagging data with the aim of estimating simultaneously K in both areas and to transfer adequately uncertainties associated with the different data sets. From this study, it was showed that fish inhabiting waters south of 10° N latitude can be expected to grow generally larger but at slower rate than in the North (L∞ = 112.34 cm vs. 89.38 cm, and K = 0.14 vs. 0.38, respectively). Our results are consistent with the range of growth estimates obtained in the Atlantic Ocean and in different parts of the World's oceans. In contrast, the estimates of L∞ and K done in the Senegalese region in the 1980s within the framework of the Skipjack Year Program, and traditionally applied by ICCAT, are not supported by the present study. The findings concerning the phenotypic plasticity exhibited by growth of skipjack among latitudinal regions suggest potential differences in fish population productivity and consequently imply that non-conventional stock assessment methods such as catch-at size/growth transition matrix per region could be used to assess the responses of skipjack to exploitation.

Keywords

Skipjack tunaGrowth rateConventional taggingCombined likelihoodBioenergetic function
Type
Research Article
Information
Aquatic Living Resources , Volume 21 , Issue 4 , October 2008 , pp. 349 - 356
Copyright
© EDP Sciences, IFREMER, IRD, 2008

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