Growth of the oblique-banded grouper (Epinephelus radiatus) on the coasts of Reunion Island (SW Indian Ocean)

Mahé K., Rabhi K., Bellamy E., Elleboode R., Aumond Y., Huet J., Cresson P., Roos D.

Published date: January 2016
Volume: 40
Number: 1
Pagination: 061–065
Publisher: Société Française d'Ichtyologie
doi: https://doi.org/10.26028/cybium/2016-401-006
Abstract

The oblique-banded grouper, Epinephelus radiatus (Day, 1968), occurred within the whole Indo- West Pacific where it is harvested by small-scale coastal fisheries. The aim of this study was to estimate the growth of this species at Reunion Island (South-West Indian Ocean) since no study investigated this topic so far. Fifty-seven individuals were sampled in the landings of the French local artisanal fisheries from March 2014 to March 2015. The relationships between two types of body length (total and standard lengths, cm) and total weight (g) were significant (p < 0.05). Total length-weight relationship was described by the following param- eters: a = 0.01 and b = 3.098. For each individual, morphometry of the whole otolith was described with several parameters (OL: otolith length; OWI: otolith width; OA: otolith area; Ow: otolith weight). Age was determined on a transversal section of otolith. Among the morphometric parameters of otoliths, only the weight (p = 0.002) was significantly correlated with the age of E. radiatus, with no difference between left and right otolith (p = 0.67). Von Bertalanffy growth equations were TLt = 65.99(1 – e–0.20(t)) and Wt = 4526.44(1 – e–0.20(t))3.

Keywords: Ageing - Epinephelidae - Epinephelus radiatus - Indian Ocean - Otolith - Otolith weight
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