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Age, growth and mortality of the striped seabream Lithognathus mormyrus (Linnaeus, 1758) in the Gulf of Tunis (Central Mediterranean Sea)

Published online by Cambridge University Press:  14 January 2021

Asma Khaldi*
Affiliation:
Université de Tunis El Manar, Faculté des Sciences de Tunis, LR18ES41 Laboratoire d’écologie, biologie et physiologie des organismes aquatiques, 2092Tunis El Manar, Tunisie
Ines Chater
Affiliation:
Université de Tunis El Manar, Faculté des Sciences de Tunis, LR18ES41 Laboratoire d’écologie, biologie et physiologie des organismes aquatiques, 2092Tunis El Manar, Tunisie
Romain Elleboode
Affiliation:
IFREMER (Institut Français de Recherche pour l'Exploitation de la Mer), Pôle National de Sclérochronologie, 150 quai Gambetta, BP 699, 62321Boulogne Sur Mer, France
Kélig Mahé
Affiliation:
IFREMER (Institut Français de Recherche pour l'Exploitation de la Mer), Pôle National de Sclérochronologie, 150 quai Gambetta, BP 699, 62321Boulogne Sur Mer, France
Nadia Chakroun-Marzouk
Affiliation:
Université de Tunis El Manar, Faculté des Sciences de Tunis, LR18ES41 Laboratoire d’écologie, biologie et physiologie des organismes aquatiques, 2092Tunis El Manar, Tunisie
*
Author for correspondence: Asma Khaldi, E-mail: asmaa.khaldii@gmail.com

Abstract

Despite the high commercial value of the striped seabream Lithognathus mormyrus (Linnaeus, 1758) in the Gulf of Tunis, biological data on its age, growth and exploitation rate are lacking. With the aim of estimating growth parameters, 516 individuals, ranging from 6–27.5 cm total length and from 3.5–293.5 g total weight, were collected from the artisanal fishing fleet between February 2014 and July 2016. The somatic growth presented a positive allometry and was described by the equation TW = 6.54 10−3TL3.213. The monthly analysis of the marginal increment of the otoliths revealed that only one annulus was deposited per year. The estimated von Bertalanffy growth parameters were: L = 30.18 cm, k = 0.303 year−1 and t0 = −1.42 years. Total and natural instantaneous rates of mortality were respectively Z = 0.784 year−1 and M = 0.698 year−1. Exploitation rate (E = 0.1) showed that the Gulf of Tunis stock of L. mormyrus is not overexploited. The estimated length class giving highest yield (Lopt) was 17.15 ± 1.71 cm.

Type
Research Article
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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