关键词: 长江江苏段, 鱼类, 种类组成, 优势种

Abstract:

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.

Key words: the Yangtze River in Jiangsu Province, fish species, species compositon, dominant species