Otolith Microchemical Analysis of Tapertail Anchovy Coilia nasus from Ariake Sea and Its Adjacent Tributaries in Japan
LIU Hongbo1, JIANG Tao1, XUAN Zhongya2, QIU Chen2, YANG Jian1,2
1. Key Laboratory of Fishery Ecological Environment Assessment and Resource Conservation in Middle and Lower Reaches of the Yangtze River, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China; 2. Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China
Abstract：The estuarine tapertail anchovy (Coilia nasus) only distributes in Ariake Sea and the adjacent tributary rivers (e.g., Chikugo River and Rokkaku River) flowing into this sea area of Japan. It is a traditional commercial fish resource in this region and has been listed in the category of “vulnerable” species by the Fisheries Agency of Japan. For investigating its population dynamics, life history, and salinity habitat requirement, tapertail anchovy sampled from the Ariake Sea, Rokkaku River, and Chikugo River were studied by examining the environmental signatures of strontium (Sr) and calcium (Ca) in their otoliths using microchemical analysis. The Sr and Ca concentrations were standardized to Sr∶Ca ratios of Sr∶Ca×103 (Sr∶Ca ratio >7, higher salinity seawater; 3—7, brackish water; ≤3, freshwater habitat); along line transects from the core (0 μm) to the edge and Sr intensity map (color patterns: reddish, higher salinity seawater; greenish-yellowish, brackish water; bluish, freshwater habitat), showing that fish studied was generally divided into two distinct freshwater originated (i.e., anadromous) and non-freshwater originated (i.e., sea origin) ecological types. The former type was further divided into three different patterns of habitat history. The phenomena clearly reflected the diversity of population composition, fluctuation migration patterns and flexible habitat requirement strategies of tapertail anchovy in studied waters. In addition, 30% of tapertail anchovy in the present study were found incubation in the brackish-water, indicating that for the tapertail anchovy around Ariake Sea, the recruitments originated from estuarine brackish water also played the an important role, beside those traditionally originated from the tributary rivers.
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2020, Vol. 39 
