Otolith Microchemistry Reveals Life History and Habitat Use of Coilia nasus from the Dayang River of China
文献类型： 外文期刊
作者： Hu, Yuhai 1 ; Jiang, Tao 2 ; Liu, Hongbo 2 ; Chen, Xiubao 2 ; Yang, Jian 1 ;
作者机构： 1.Nanjing Agr Univ, Wuxi Fisheries Coll, Wuxi 214081, Peoples R China
2.Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Lab Fishery Microchem, Wuxi 214081, Peoples R China
关键词： Coilia nasus; Dayang River; otolith; strontium; calcium; life history; habitat use; anadromy; residency
期刊名称：FISHES （ 影响因子：3.17； 五年影响因子：3.098 ）
ISSN：
年卷期： 2022 年 7 卷 6 期
页码：
收录情况： SCI
摘要： The estuarine tapertail anchovy Coilia nasus is distributed throughout the Dayang River. However, the life history and habitat use of this fish remain unknown. Here, the microchemistry patterns of Sr and Ca in 23 otoliths collected from the lower reaches of the Dayang River were analyzed using an X-ray electron probe microanalyzer. The anchovies were divided into two patterns: (1) with low Sr/Ca ratios (<3.0) and a single bluish Sr concentration map, indicating that it only experienced a freshwater habitat during its whole life, and (2) with Sr/Ca ratios fluctuating between low and high (>3.0) phases and Sr concentration maps showing various colors, including blue, green, yellow, and red, from the core to the edge of otoliths, whose larvae hatched in freshwater and spent their first winter in brackish or sea waters. The juveniles then stayed in estuarine water areas for further growth and feeding until sexual maturity, when the mature adults returned to the spawning grounds in the river. The co-existence of freshwater residents and anadromous C. nasus in the Dayang River has been studied for the first time, and its possible spawning ground was discovered. These findings provide essential information to effectively protect this species and guide its rational, sustainable utilization.
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