The book summarizes the results of long-term observations of the behavior and distribution of the tulle depending on the water regime, weather conditions and seasons, shows tables and illustrations that clearly reflect these processes. The broad research material shows the conditions of existence of the Azov tulle, features of its ecology, rational methods of forecasting fish stocks and its fishing are given .. The book is intended for ichthyologists, fish farm workers, fishery protection authorities, industrial exploration. /Results are aware of long-term observations on the behavior and distribution of Azov tyulka in range to sea water regime, seasons and weather conditions. Tables and figures are presented demonstrating visually the processes in question. Extensive research data allows us to reveal habitat conditions of the Azov tyulka and environmental characteristics of the fish. Efficient methods of predicting tyulka stocks and its fishery are recommended. The book is meant for ichthyologists, those who are engaged in fisheries, fish protection bodies and fish prospecting.