中国水产科学Issue(5)：978-985,8.DOI:10.3724/SP.J.1118.2015.15092
信江发现溯河洄游型刀鲚的实证研究
Existence of anadromous Coilia nasus in Xinjiang River of Jiangxi Province as determined by otolith microchemistry
摘要
Abstract
The estuarine tapertail anchovy Coilia nasus (Clupeiformes, Engraulidae) is a highly commercial mi-gratory fish species in the Yangtze River. Because of adverse human activities such as overfishing, C. nasus pro-duction has sharply declined. Investigating the large-scale distribution of this fish is very important for evaluation of its resources and habitat. Previous evidence revealed the existence of anadromous C. nasus in Poyang Lake;this study was conducted to confirm whether there is also anadromous C. nasus in the Xinjiang River. An electron probe microanalyzer was applied to analyze Sr and Ca microchemistry patterns in otoliths of C. nasus collected from the Ruihong section of the Xinjiang River (the most distant branch of Poyang Lake, ~1000 km from the Yangtze River estuary) near Yugan County in Jiangxi Province. Line transect results clearly showed a complex Sr/Ca ratio (i.e., Sr/Ca×103) pattern, including low-ratio freshwater habitat (Sr/Ca×103<3) and high-ratio seawater habitat (3<Sr/Ca×103<7), which clearly demonstrates that the anchovies had experienced anadromous migration. These two microchemistry patterns verify, for the first time, the existence of anadromous C. nasus in the Xinjiang River. Home spawning is thought to be the main reason for such a long migratory for the anchovy in the Xinjiang River, resulting from natural selection for relatively stable spawning conditions. A 1000-km migratory distance reflects an extremely strong migration ability of C. nasus, which is a relatively small fish. The anchovies enter into the Xinjiang River to visit habitat required for spawning and early life stages, and there are likely spawning grounds of anadromous C. nasus in this river.关键词
刀鲚/耳石/电子探针/信江/鄱阳湖Key words
Coilia nasus/otolith/electron probe microanalyzer/Xinjiang River/Poyang Lake分类
农业科技引用本文复制引用
卢明杰,姜涛,刘洪波,陈婷婷,杨健..信江发现溯河洄游型刀鲚的实证研究[J].中国水产科学,2015,(5):978-985,8.基金项目
国家自然科学基金面上项目(31372533) （31372533）
