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首页> 外文期刊>Journal of Ichthyology >Variability of Black and Caspian Sea Sprat Clupeonella cultriventris (Clupeidae) Growth in the Contemporary Range
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Variability of Black and Caspian Sea Sprat Clupeonella cultriventris (Clupeidae) Growth in the Contemporary Range

机译：黑海和里海小海藻（Clupeonella cultriventris（Clupeidae））在当代范围内的生长变异性

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摘要

The size and age composition of the population of Black and Caspian Sea sprat Clupeonella cul-triventris, as well as the variation of the growth of fish in the reservoirs of the upper reaches of the Volga, are reported and a comparative analysis of group and individual variability of fish growth within the native (Caspian, Azov, and Black seas) and contemporary (formed due to invasion) ranges is presented. The degree of variability and the asymmetry of sprat body length distribution have been shown to increase under the conditions of large population sizes, deficit of food, and slow growth. Variability was also elevated near the borders of the range of the species, notwithstanding the abundance of food. It is shown that invasion of sea walnut comb jelly Mnemiopsis leydi into the Azov and Caspian Seas had so undermined feed base of sprat, that it is not only decreased its abundance and fecundity but also slowed growth of the fish.
机译：报告了黑海和里海鲱小海豹（Clupeonella cul-triventris）种群的大小和年龄组成，以及伏尔加河上游水库中鱼类生长的变化，并对群体和个体进行了比较分析。介绍了本地（里海，亚速海和黑海）和当代（由于入侵而形成）范围内鱼类生长的变异性。事实表明，在人口规模大，食物短缺和生长缓慢的情况下，西鲱的体长分布的可变性和不对称性会增加。尽管有很多食物，但物种范围附近的变异性也有所提高。结果表明，海核桃梳子果蝇Mnemiopsis leydi入侵亚速海和里海，严重损害了鲱鱼的饲料基础，不仅降低了鱼的丰度和繁殖力，而且减缓了鱼的生长。

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