金泽水库鱼类的群落结构和资源量

通过2017年9月到2019年12月按季节共9次对金泽水库运行初期进行了鱼类资源的调查，分析了鱼类群落结构特征，并用水声学DIDSON 双声纳鱼探仪对金泽水库的鱼类资源量进行了探测，结果如下：共调查到30种鱼类，隶属于5目7科，其中淡水型鱼类28种、河口性1种、洄游性1种；草食性、植食性、滤食性、杂食性、初级肉食性和次级肉食性鱼类分别有2、3、2、9、5和9种; 渔获物中滤食性鲢和鳙无论在个体数还是重量均排在第一位；优势种（IRI>1000）有鲢、鳙、鲫和刀鲚；水声学双声纳鱼探仪探测金泽水库目前的资源量约在13.33万尾、11.58万kg，鱼产力处在高产水平。现在的鱼类群落结构与水库建成投入使用前相比，已有较大的差异；现有鱼类与太湖鱼类区系相似性高。 关键词：金泽水库；鱼类；群落结构；运行初期；资源量

Fish community structure and resource in Jinze Reservoir

The fish community in Jize Reservoir were seasonally investigated from September 2017 to October 2019. The main fish resources were detected by dual-frequency identification sonar (DIDSON), and the fishery acoustic data were processed by Software Echoview. A total of 30 fish species from 7 families 5 orders were collected, with 28 species of freshwater fish, 1 species of estuary fish, 1 species of emigratory fish. And the herbivorous fishes, phytophagous fishes, planktivore fishes, omnivorous fishes, primary carnivorous fishes and second carnivorous fishes were 2,3,2,9,5 and 9 species respectively. The planktivore feeding fishes including silver carp and Bighead Carp ranked No.1 in both individual number and mass in catches. The dominant fishes (IRI>1 000)were Hypophthalmichthys molitrix, Hypophthalmichthys nobilis, Hypophthalmichthys nobilis, Coilia nasus. The total number of fish was 133 300 and the total resource were 115 800 kg respectively in Jinze Reservoir by the DIDSON, the fish stocksperm 2 was at a high level according to water conservancy industry standard of the people''s Republic of China SL 563-2011, ICS 93,160, P55. The present fish community structure was significant difference comparing with that before the reservoir was running, but which was high similarity with the fish fauna in Lake Taihu.