Identification of Different Ecomorphotypes of Coilia nasus in the Dawanzhou Section of the Yangtze River
文献类型： 外文期刊
作者： Liu, Jiahao 1 ; Jiang, Tao 2 ; Xue, Junren 2 ; Chen, Xiubao 2 ; Liu, Hongbo 2 ; Yang, Jian 1 ;
作者机构： 1.Nanjing Agr Univ, Coll Fisheries, Wuxi 214081, Peoples R China
2.Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Fishery Microchem Lab, Wuxi 214081, Peoples R China
关键词： Coilia nasus; otolith microchemistry; freshwater coefficient; Dawanzhou section of Yangtze River
期刊名称：FISHES （ 影响因子：2.4； 五年影响因子：2.4 ）
ISSN：
年卷期： 2025 年 10 卷 3 期
页码：
收录情况： SCI
摘要： X-ray electron probe microanalyzer technology was used to study the microchemistry and habitat history of Coilia nasus collected from the Dawanzhou section of the Yangtze River between May and June 2023. The Sr/Ca ratio from the otolith core to the otolith diameter was low (640-1100 mu m), representing the first stage of development. In the second stage, C. nasus exhibited two distinct types. The first type, which included individuals 5HK05 and 6HK03, exclusively inhabited brackish estuarine waters. The second type, comprising 13 individuals, resided in higher-salinity seawater environments (Sr/Ca > 7). Furthermore, individuals 5HK01, 5HK03, 5HK07, and 6HK05 displayed a phase with a high Sr/Ca ratio compared to other fish. Freshwater coefficient analysis indicated that C. nasus in the Dawanzhou water area was unlikely to continue upstream to Dongting Lake in the middle reaches of the Yangtze River but may have entered Poyang Lake through its mouth or reproduced in its upper reaches. Analysis of sexual maturity and migration history suggested that the Dawanzhou section primarily serves as a migration channel for C. nasus, with a potential spawning ground for this high-value fish located nearby.
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