摘要
长江自宜昌以上，地势骤然升高，两岸都是连绵的高山，河层情况很复杂，有许多礁石，形成险滩，它的许多支流，也都来自山区和高地，因此水流湍急。自宜昌以下，地势便逐渐平坦，进入江河平原地带，因此水流是缓慢的。自然的地理条件形成了长江的两个不同的天然环境，宜昌似乎正是处在这二者之间。我们知道有些鱼类特别适应于急流地方，
This work is based on a collection made by the writer in 1954 at Ichang. A total of 72 species, all known to science, are reported, of which 44 are recorded for the first time for that locality. A review of the distribution of these species in the Yangtze River shows that while many are of wide occurrence, there are a number of species which were known to occur only in Upper Yangtze, and still more were known to have a distribution limited to the lower and middle parts of the River. In view of this fact the writer is of the opinion that Ichang probably represents the border between the two faunal sub-areas of which our ichthyologists and zoogeographers have been aware.
