汉江上游渔业资源调查

Investigation on fishery resources in the upper reaches of Hanjiang River,Shaanxi Province

根据2011、2015-2017年4年汉江干流上游段及其部分支流的渔业资源调查数据资料,可知汉江上游流域内有鱼类5目14科80种,汉江上游的主要鱼类为鲤科,共有51种,其中国家和陕西省省级保护鱼类有15种;汉江干流三花石以上河段的鱼类群落结构与三花石以下河段存在差异,库区均集中了30多种经济鱼类;渔获物季节分析显示,各类群鱼类对季节有较强的选择性;生物量组成、多样性指数和优势种等分析结果显示,鱼类种群小型化趋势明显,生物生境碎片化,抗风险能力降低。

Based on the data of collation and induction of the fishery resources in the main stream and partial tributary of the upper reaches of Hanjiang River,80 species of fishes belong to 15 families and 5 orders were collected in the past ten years.The Cyprinidae had 51 species is the main variety,and the national and provincial protected fish had 15 species in this region.Taking the Sanhuashi as the boundary,the fish community structure in the upstream and downstream of the main stream had few differences,and more than 30 mainly economic varieties were concentrated in the reservoir area.Seasonal analysis of the catch showed that fish species had strong selectivity.Analysis of biomass composition,diversity index and dominant species showed that the fish population had an evident trend of miniaturization,the ability to resist risks was reduced,and the biological habitat tended to be fragmented.