Stable isotopic composition of otoliths in identification of stock structure of small yellow croaker (Larimichthys polyactis) in China

文献类型： 外文期刊

第一作者： Wang Yukun

作者： Wang Yukun;Huang Jiansheng;Jin Xianshi;Sun Yao;Wang Yukun;Tang Xuexi

作者机构：

关键词： small yellow croaker;otolith;stable isotope chemistry;stock structure

期刊名称：ACTA OCEANOLOGICA SINICA （ 影响因子：1.431； 五年影响因子：1.445 ）

ISSN： 0253-505X

年卷期： 2016 年 35 卷 6 期

页码：

收录情况： SCI

摘要： Oxygen and carbon isotope ratios (delta O-18 and delta C-13) in otoliths were used to identify the stock structure of small yellow croaker, Larimichthys polyactis. Otoliths were collected from fish at five locations across the Yellow Sea and the Bohai Sea representing most of their distributional range and fisheries areas. The significant differences in the isotopic signatures showed that the five locations could be chemically distinguished and clearly separated, indicating stock subdivision. Correlation of delta O-18 and delta C-13 values suggested that population of L. polyactis could be divided into the Bohai Sea group, the southern Yellow Sea group and the central Yellow Sea group. Discriminant analysis of delta O-18 and delta C-13 values demonstrated a high significant difference with 85.7% classification accuracy. The spatial separation of L. polyactis indicated a complex stock structure across the Yellow Sea and the Bohai Sea. These results indicate that optimal fisheries management may require a comprehensive consideration on the current spatial arrangements. This study has provided further evidence that measurement of the stable isotopes ratios in otolith can be a valuable tool in the delineation of fishery management units.

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