The smooth clam Callista chione is distributed in Moroccan Mediterranean coasts in considerable densities. This study examines the population structure, age, growth, mortality, longevity and exploitation level of the smooth clam on Martil coast. Samples were collected monthly from July 2016 to July 2017. Morphometric relationships were studied and showed negative allometric growth for the width/length, height/length and weight/length relationships. Four age groups were determined by Bhattacharya’s method. Growth parameters were estimated from the Ford–Walford method to be $L_{\infty }=103.1$ mm, $K=0.38$ yr ${}^{-1}$ and $t_0=0.43$. Growth performance indices were found as $\varphi$ ${}^{\prime }$ $=$ 3.60 and $P=5.61$. Total mortality, natural mortality and fishing mortality were estimated to be $Z=2.64$ yr⁻¹, $M=0.55$ yr⁻¹ and $F=2.09$ yr⁻¹ respectively. The exploitation rate was calculated to be E = 0.79 proving an overexploitation of the species. The longevity was estimated to be 8 years. Results present necessary biological parameters to ensure the conservation, management and sustainable exploitation of Callista chione in Morocco.

光滑的蛤蜊Callista chione以相当大的密度分布在摩洛哥地中海沿岸。本研究考察了 Martil 海岸平纹蛤的种群结构、年龄、生长、死亡率、寿命和开发水平。从 2016 年 7 月到 2017 年 7 月，每月收集样品。研究形态计量关系并显示宽度/长度、高度/长度和重量/长度关系的异速生长负增长。Bhattacharya 的方法确定了四个年龄组。根据 Ford-Walford 方法估计生长参数为${升}_{\infty }=103.1$ 毫米， $钾=0.38$ 年 ${}^{-1}$ 和 ${吨}_0=0.43$. 增长绩效指数被发现为$\phi$ ${}^{\prime }$ $=$ 3.60 和 $磷=5.61$. 总死亡率、自然死亡率和捕捞死亡率估计为$Z=2.64$年^-1 ,$米=0.55$年^-1和$F=2.09$yr ^-1分别。开发率计算为 E = 0.79，证明对该物种的过度开发。寿命估计为8年。结果提供了必要的生物学参数，以确保摩洛哥Callista chione的保护、管理和可持续开发。