Otolith microchemical fingerprints of Coilia nasus from the Taizhou section of Changjiang River in Jiangsu Province
To understand life history and current resource status of Coilia nasus in the Taizhou section of the Changjiang River,an electron probe microanalyzer was applied to analyze the microchemistries of strontium(Sr)and calcium(Ca)in otoliths of C.nasus.The results showed that the Sr/Ca ratio in the otoliths of all individuals had varied between low value less than 3(corresponding to freshwater habitat)and high value more than 3(corre-sponding to brackish water or sea water habitat),indicating a typical anadromous life history.According to the freshwater coefficient,the resource of anadromous C.nasus could be divided into short-term and long-term freshwa-ter dependence types.The significant differences in freshwater coefficient between the two types indicated that the individuals of both types might originate from different spawning grounds of the Changjiang River.The Taizhou sec-tion of Changjiang River would be an important migration channel for C.nasus according to the combined analysis of microchemical and gonadal development characteristics of the fish.Our results can improve our understanding of the effectiveness of 10-year fishing ban on recovery of economic fish stocks and their habitats in the Changjiang River.
Coilia nasusotolith microchemistryTaizhou section of the Changjiang River in Jiangsu Provincehabitat historyresource
国家科技期刊平台
NSTL
万方数据
