北盘江光照水电站建设前后鱼类资源变化

2009年9月和2010年5月,对北盘江光照水电站影响河段鱼类资源进行现场调查,采集鱼类45种,其中18种为新记录种,各河段鱼类组成特点与生态类型相符。结合相关文献资料,确定调查河段鱼类共71种,其中珍稀濒危鱼类4种,珠江水系特有鱼类3种。光照电站的建设对库区河段的鱼类资源影响显著,喜静缓流生境鱼类占76.5%,喜急流或流水生境鱼类占23.5%;流水生境河段受影响较小,约90%鱼类喜流水生境。调查水域没有典型产漂流性卵鱼类的产卵生境,原记录的产粘性卵鱼类产卵场受影响较小。

Changes of fishery resources after the construction of Guangzhao hydropower stations on Beipan River

Combined with the result analysis to the previous investigation implemented during both the period of establishment of Baipanjian river photo hydroelectric power plant and the period before the establishment ,and based on the relevant documents, the onsite investigation on impact of Baipanjian hydroelectric power plant on river fish source is decided to directed to subjects of river fishes of totally 17 different kinds, including rare and endangered fishes of 4 kinds ,of pearl river special fishes of 3 kinds and newly recorded fishes of 18 kinds. The impact of the establishment of photo hydroelectric power plant on the river fish source is remarkable. Small fishes of liking quietness and slow water flowing environment and fishes of conventional breeding gradually become advantaged kinds and fishes of liking quick water flowing decrease remarkably or retreat from the dam river area. In the investigated area there has no typical breeding environment suitable to domestic fishes and other fishes and, the impact on the breeding sites for previously recorded fishes of adhesiveness eggs is small. The fish raising productivity effect needs further investigation.