Revista de Biología Tropical ISSN Impreso: 0034-7744 ISSN electrónico: 2215-2075

OAI: https://revistas.ucr.ac.cr/index.php/rbt/oai
Growth and mortality rates of bigeye tuna <i>Thunnus obesus</i> (Perciformes: Scombridae) in the central Atlantic Ocean
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Keywords

bigeye tuna
thunnus obesus
growth
mortality
the central atlantic ocean
size frequency analysis
length weight relationship
patudo
thunnus obesus
crecimiento
mortalidad
el océano atlántico central
el análisis de frecuencia de tallas
relación talla peso

How to Cite

Zhu, G., Xu, L., Zhou, Y., & Chen, X. (2009). Growth and mortality rates of bigeye tuna <i>Thunnus obesus</i> (Perciformes: Scombridae) in the central Atlantic Ocean. Revista De Biología Tropical, 57(1-2), 79–. https://doi.org/10.15517/rbt.v57i1-2.11292

Abstract

Age and growth parameters were estimated for bigeye tuna Thunnus obesus Lowe, 1839 sampled from China longline fisheries in the central Atlantic Ocean from October 2002 to July 2003 and from August 2004 to March 2005. The von Bertalanffy growth parameters were estimated at L∞=217.9 cm fork length, k=0.23 year-1, and t0=-0.44 year. The total mortality rate (Z) was estimated to be from 0.82 to 1.02, the fishing mortality (F) and the natural mortality were 0.54 year-1 and 0.39 year-1, respectively. The exploitation ratio (E) was 0.35. This study provides the detailed estimates of growth and mortality rate for bigeye tuna in the central Atlantic Ocean, which can be used as biological input parameters in further stock evaluations in this region. However, age analysis, additional validation of the size composition and stock structure are needed for future studies.
https://doi.org/10.15517/rbt.v57i1-2.11292
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