Irregularities of the Bottom and Fish Aggregations on a Stretch of the Irtysh

摘要

An original method for estimation of the effect of bottom irregularities on density of fish aggregations is elaborated. Calculation of the investigated relationship is based on material of surveys collected by an AsCor hydroacoustic complex and is made by means of special software. With reference to a deep-water stretch of the Irtysh chaimel, the quantitative parameters of the relationship between densities offish aggregations and the index of bottom irregularity are revealed. The diagram of the relationship between bottom irregularities and density of fish aggregations, the three-dimensional model of bottom rehef of the investigated water area, and echograms of fish aggregations on various stretches of the river are presented.