Abstract

The growth parameters were determined separately for the two sexes of Penaeus kerathurus, as well as for the two (northeastern and southern) substocks of the species in Tunisia. Seasonal sampling from catches of this species in the coastal and the offshore waters was carried out during the period between 2010 and 2012 for the northeastern substock and between 2010 and 2014 for the southern substock in order to collect length frequency distribution data. The modal decomposition of these distributions by the Bhattacharya’s method and refined by the NORMSEP method made it possible to calculate the mean size of each identified mode, which was attributed an age value by referring to the date of spawning and the date of sampling. Based on these data, the L_∞ (cm) and K (yr^–1) growth parameters for both sexes of the species were calculated using the Von Bertalanffy model. The results showed that females had a higher L_∞ value than males, but the growth coefficient K was higher in males than in females for both stocks. Furthermore, the growth parameters in the northeast and in the south of Tunisia were different. A generalized linear model (GLM) test showed that the growth rate, natural mortality, and performance index of Penaeus kerathurus positively correlated to the sea surface temperature.

中文翻译：

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使用生命历史参数表征两只对虾（对虾）（Forskål，1775）

摘要

分别确定了对角对虾的两个性别以及突尼斯该物种的两个（东北和南部）亚种群的生长参数。为了收集长度频率分布数据，在2010年至2012年期间对东北亚种群进行了季节性捕获，并在2010年至2014年间对南部亚种群进行了季节性捕获。通过Bhattacharya方法对这些分布进行模态分解，并通过NORMSEP方法进行细化，从而可以计算出每个已识别模式的平均大小，该模式通过参考产卵日期和采样日期来赋予年龄值。基于这些数据，大号_∞（厘米），并使用冯·贝塔朗菲模型计算出该物种两性的K（yr – ¹）生长参数。结果表明，女性有较高的大号_∞比男性价值，但增长系数ķ是男性比女性两个类股走高。此外，突尼斯东北部和南部的生长参数也不同。广义线性模型（GLM）测试表明，对虾的生长速率，自然死亡率和性能指数与海表温度成正相关。