Migration and feeding habits of juvenile Chinese sturgeon (Acipenser sinensis Gray 1835) in the Yangtze Estuary: Implications for conservation
Migration and feeding habits of juvenile Chinese sturgeon (Acipenser sinensis Gray 1835) in the Yangtze Estuary: Implications for conservation
复制标题
长江口中华鲟幼鱼（Acipenser sinensis Gray 1835）的洄游和摄食习性：对保护的意义
DOI：
10.1002/aqc.2935
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Zhuang P
中科院分区：
文献类型：
--
作者：
Wang SK;Zhang T;Yang G;Wang Y;Zhao F;Zhuang P
Spatial and temporal variation in migration and feeding ecology of juvenile Chinese sturgeon (Acipenser sinensisGray 1835) is reported for waters around Chongming Island, Yangtze Estuary, between April and August 2015.A migration survey showed that juvenile Chinese sturgeon remained within the Yangtze Estuary for a period of time preceding their onward migration to the sea; upper estuarine reaches were an important transition habitat during April and May, while nearshore coastal areas were foraging habitat during June to August.Stable isotopic analysis revealed (1) significantly lower isotope values in smaller‐sized Chinese sturgeon (≤100 mm) than larger‐ sized fish (>100 mm), which indicated a dietary shift likely occurs at fork lengths greater than 100 mm; (2) the increase in values ofδ13C andδ15N from May to August implied an ontogenetic dietary shift from lower to higher trophic‐level prey items; and (3) slight changes in distributional range among different coastal sites implied that individuals fed on similar food items.Coastal shallows represent major foraging areas for juvenile Chinese sturgeon in the Yangtze Estuary. In addition to the conventional conservation measures at the nature reserve, we suggest additional conservation actions to better protect juvenile Chinese sturgeon residing in the estuary; namely: (1) expanding the protected area and adding a seasonal component, from April to August, to afford better protection of juvenile Chinese sturgeon in the whole estuary, but particularly just upstream of the estuary mouth and in nearshore waters; and (2) banning all fishing activities and extending protection to the food resources (such as zoobenthos and small‐sized fishes) of juvenile Chinese sturgeon in coastal shallows.
