长江江苏段鱼类种类组成和优势种研究

根据2001~2005年对长江江苏段鱼类的调查与监测，结合鱼类学研究的最新观点，对长江江苏段鱼类历史资料进行整理和归并，结果长江江苏段共记录鱼类161种（19目42科）。本次调查采集到鱼类15目31科108种，其中2个新种，2个省新记录，种类组成以鲤科鱼类为主。根据相对重要性指标（IRI）计算，江苏全江段的优势种分别为鳖hemiculter leucisculus、鲫Carassius auratus auratus (Linnaeus)、鳊Parabramis pekinensis (Basilewsky)、鲤Cyprinus capio Linnaeus、刀鲚Coilia nasusSchlegel、贝氏Hemiculter bleekeriWarpachowsky、似鳊Pseudobrama simony (Bleeker)、香斜棘鱼衔Callionymus olidus Günther、鲢Hypophthalmichthys molitrix (Valenciennes)、草鱼Ctenopharyngodon idellus (Valenciennes)；优势种平均体重为0.974~292.431 g。江段鱼类小型化、低龄化仍十分严重。

ON FISH COMPOSITION AND DOMINANT SPECIES IN THE YANGTZE RIVER IN JIANGSU PROVINCE

The survey showed that 108 fish species representing 15 orders (31 families) in the Yangtze River in Jiangsu Province,and two new species and two new province record species were found.The Cyprinidae consisting of 48 species is the largest family in the number of species,accounting for 44.44%;the Cobitidae and the Bagridae consists of 7 species respectively,accounting for 6.48%;the Gobiidae consists of 6 species,accounts for 5.56%;the Serranidae consisting of 5 species accounts for 4.63%;the Salangidae and the Eleotridae consist of 3 species respectively,accounting for 2.78%;the Engraulinae,the Siluridae,the Mugilidae,the Periophthalmidae and the Taenioididae consist of 2 species respectively,accounting for 1.85%;for the remains,19 families were represented by one species respectively.The dominant species in the Yangtze River in Jiangsu Province are 〖WTBX〗Hemiculter leucisculus〖WTBZ〗 (Basilewsky),〖WTBX〗Carassius auratus auratus〖WTBZ〗 (Linnaeus),〖WTBX〗Parabramis pekinensis〖WTBZ〗 (Basilewsky),〖WTBX〗Cyprinus capio〖WTBZ〗 Linnaeus,〖WTBX〗Coilia nasus〖WTBZ〗 Schlegel,〖WTBX〗Hemiculter bleekeri〖WTBZ〗 Warpachowsky,〖WTBX〗Pseudobrama simony〖WTBZ〗 (Bleeker),〖WTBX〗Callionymus olidus〖WTBZ〗 Günther,〖WTBX〗Hypophthalmichthys molitrix〖WTBZ〗 (Valenciennes),〖WTBX〗Ctenopharyngodon idellus〖WTBZ〗 (Valenciennes),and the mean weight of the dominant species is 0.974~292.431g.And the fish resources tend to be young in age and miniaturized in size.Combining monitoring data with historical data of fish in the Yangtze River in Jiangsu Province in the period of 2001~2005,it is concluded that there are 161 species of fish (19 orders) in the Yangtze River in Jiangsu Province.