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

Type Article
Acceptance Date 2021 IN PRESS
Language English
Author(s) Khaldi AsmaORCID1, Chater InesORCID1, Elleboode Romain2, Mahé Kelig2, Chakroun-Marzouk Nadia1
Affiliation(s) 1 : Université de Tunis El Manar, Faculté des Sciences de Tunis, LR18ES41 Laboratoire d’écologie, biologie et physiologie des organismes aquatiques, 2092 Tunis El Manar, Tunisie
2 : IFREMER (Institut Français de Recherche pour l'Exploitation de la Mer), Pôle National de Sclérochronologie, 150 quai Gambetta, BP 699, 62321 Boulogne Sur Mer, France
Source Journal of the Marine Biological Association of the United Kingdom (0025-3154) (Cambridge University Press (CUP)) In Press
DOI 10.1017/S0025315420001307
Keyword(s) Age, growth, Gulf of Tunis, Lithognathus mormyrus, Lopt, mortality, otolithometry, Sparidae, weight–length relationship
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.

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Khaldi Asma, Chater Ines, Elleboode Romain, Mahé Kelig, Chakroun-Marzouk Nadia Age, growth and mortality of the striped seabream Lithognathus mormyrus (Linnaeus, 1758) in the Gulf of Tunis (Central Mediterranean Sea). Journal of the Marine Biological Association of the United Kingdom IN PRESS. Publisher's official version : https://doi.org/10.1017/S0025315420001307 , Open Access version : https://archimer.ifremer.fr/doc/00676/78770/