Comparison of age and growth of grass and silver carp above and below Changzhou Dam in the Pearl River, China
Comparison of age and growth of grass and silver carp above and below Changzhou Dam in the Pearl River, China
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DOI：
10.1080/02705060.2023.2251517
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发表时间：
2023-08-24
影响因子：
1.3
通讯作者：
Li，Jie
中科院分区：
文献类型：
--
作者：
Huang，Yanfei;Liu，Yue;Li，Jie
河流洄游鱼类的生活史通常会因水坝的存在而中断，而且上游和下游的种群往往表现出不同的生活史特征。本研究比较了珠江长洲坝上、下游草鱼和银鲤的年龄和生长速度。草鱼1龄和2龄的标准体长组成和反算体长均为上游个体大于下游个体;上下游群体的体长-体重关系存在差异，但性比、年龄结构和生长均无显著差异。对于银鲤，只有SL组成不同的上游和下游群体之间的性别比例，年龄结构，SL在年龄和生长速度是相似的。两种鱼的平均年龄SL和生长速率在高纬度地区均低于中、低纬度地区，在低纬度地区，长江种群的平均年龄SL和生长速率均高于银。在中、低纬度地区，种群间的平均SL或生长没有差异。草鱼的年龄和生长随小尺度生态过程和区域或纬度的变化而变化，而银鲤的年龄和生长随纬度和大尺度地理范围的变化而变化。本研究不仅为淡水河洄游鱼类的渔业管理和保护提供了指导，而且为深入了解淡水河洄游鱼类生活史性状变异与适应能力之间的关系提供了新的思路。
The life cycles of potamodromous fishes are generally interrupted by the presence of a dam, and populations often display different life history traits between upstream and downstream. This study compared the age and growth rates of grass carp and silver carp above and below Changzhou Dam in the Pearl River. Standard length (SL) composition and back-calculated SL at ages one and two years were greater for grass carp upstream than for downstream individuals; and the length–weight relationship differed between upstream and downstream populations, while the sex ratio, age structure and growth were not significantly different. For silver carp, only SL compositions differed between upstream and downstream populations; sex ratio, age structure, SL-at-age and growth rates were similar. Mean SL-at-age and growth rates of both species were lower at high latitudes than at middle and low latitudes, and populations in the Yangtze River had greater mean SL-at-ages and faster growth relative to silver carp at low latitudes. There were no differences in mean SL or growth among populations at middle and low latitudes. For grass carp, age and growth varied with small-scale ecological processes and regions or latitude, while for silver carp, such variations were proportionate to latitude and the large-scale geographical range. This study provides not only guidelines for fisheries management and conservation of exploited potamodromous fishes, but also insights into the relationship between life history trait variation and adaptive capacity.