葛洲坝截流后长江宜昌江段的铜鱼繁殖研究

本文阐述了葛洲坝水利枢纽工程截流后,宜昌江段铜鱼产卵场的分布和规模及其繁殖条件。研究表明:铜鱼产卵场最主要部分位于坝上三峡河谷近坝端的江段中,坝下首次发现有新的小规模的产卵场。铜鱼的繁殖受水文地理自然条件、水温及水位等主要环境因子的影响。铜鱼与四大家鱼不同,不仅能在水位上涨时产卵,也能在随后的退水过程中繁殖,而且持续时间较长、产卵规模也较大。

Study on Reproduction of Coreius heterodon in Yichang Section of the Yangtze River Dammed by Gezhouba Water Conservancy Pivat

This paper elaborates the distribution and scale of spawning grounds and the reproductive conditions of Coreius heterodon in Yichang Section after damming by Gezhouba water conservancy pivot. This research shows the major part of spawning grounds of Coreius heterodon is located in the section near dam of the Trigorge canyon at upper dam. A new spawning ground with small scale was fir- st found at lower dam. The reproduction activity of Coreius heterodon is effected by the major environmental factors of natural conditions of hydrology and geog- raphy, water temprature, water level and so on. Different from the four family fishes, Coreius heterdon can spawn not only on rising in water level but also on falling in water level. The reproductive activity of Coreius heterodon while falling in water level can last a long time and the scale of spawing is also large.