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.

中文翻译：

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突尼斯湾（中地中海）条纹鲷 Lithognathus mormyrus（Linnaeus，1758 年）的年龄、生长和死亡率

尽管条纹鲷的商业价值很高石鳖(Linnaeus, 1758) 在突尼斯湾，缺乏关于其年龄、生长和开采率的生物学数据。为了估计生长参数，在 2014 年 2 月至 2016 年 7 月期间，从手工捕鱼船队收集了 516 只个体，总长度为 6-27.5 厘米，总重量为 3.5-293.5 克。体细胞生长呈现正的异速生长和由方程 TW = 6.54 10 描述-3TL3.213. 对耳石边缘增量的月度分析表明，每年仅沉积一个环。估计的 von Bertalanffy 生长参数为：大号∞= 30.18 厘米，ķ= 0.303 年-1和吨0= -1.42 年。总死亡率和自然瞬时死亡率分别为Z= 0.784 年-1和米= 0.698 年-1. 开采率 (E = 0.1) 表明突尼斯湾的存量为L. mormyrus没有被过度开发。产生最高产量 (Lopt) 的估计长度等级为 17.15 ± 1.71 厘米。