Abstract

A NUMBER of scientists (Van dem Borne, Severtzov, Ellis, Hesse) have been studying the influence of the rate of flow on the distribution of fishes in rivers and have attempted to divide the rivers into groups according to the species of fish found in them. As regards fishes of Central Asiatic rivers with very high rates of flow, the latter must influence the qualitative as well as the quantitative composition of the communities, and the sharp transition from flowing to stagnant water in Central Asia gives a favourable opportunity of tracing such variations in the composition of the fish communities in the whole course of the river.

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