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Reproductive biology, age and growth of the two-banded seabream Diplodus vulgaris (Pisces: Sparidae) in the Gulf of Gabès, Tunisia

Published online by Cambridge University Press:  31 January 2013

Aymen Hadj Taieb ,
Mohamed Ghorbel ,
Nader Ben Hadj Hamida  and
Othman Jarboui
Aymen Hadj Taieb*
Affiliation:
Institut National des Sciences et Technologies de la Mer, BP 1035–3018 Sfax, Tunisia
Mohamed Ghorbel
Affiliation:
Institut National des Sciences et Technologies de la Mer, BP 1035–3018 Sfax, Tunisia
Nader Ben Hadj Hamida
Affiliation:
Institut National des Sciences et Technologies de la Mer, BP 1035–3018 Sfax, Tunisia
Othman Jarboui
Affiliation:
Institut National des Sciences et Technologies de la Mer, BP 1035–3018 Sfax, Tunisia
*
Correspondence should be addressed to: Aymen Hadj Taieb, Institut National des Sciences et Technologies de la Mer, (Centre de Sfax) BP 1035–3018 Sfax, Tunisia email: [email protected]
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Abstract

Samples of common two-banded seabream Diplodus vulgaris (N = 1097), used in this study, were caught in the Gulf of Gabès (Tunisia) from March 2008 to February 2010. Total length ranged from 7 to 25 cm. Diplodus vulgaris is a protandric hermaphrodite. The overall ratio of females to males was 1:1.66. The reproductive season extended from October to February, and the peak spawning activity occurred in December–January. The total length at which 50% of the population reached maturity was 14.14 ± 0.16 cm for females and 13.57 ± 0.01 cm for males. Parameters of the length–weight relationship (TW = aTLb) for all individuals were a = 0.0185 and b = 2.9319. The youngest specimen in this study was 0+ years, whereas the oldest one was 9 years. The von Bertalanffy growth parameters for the whole sample were: L∞ = 25.4 cm, k = 0.179 and t0 = −1.631 year. The instantaneous rate of natural mortality was: M = 0.333 year−1.

Keywords

common two-banded seabream (Diplodus vulgaris)reproductionage and growthnatural mortalityGulf of Gabès
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 93 , Issue 5 , August 2013 , pp. 1415 - 1421
Copyright
Copyright © Marine Biological Association of the United Kingdom 2013 

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