SPECIES COMPOSITION AND BIOLOGICAL CHARACTERISTICS OF COMMERCIAL FISH IN THE KIGACH RIVER AND ESTUARIES

This work shows the species composition of semi-migratory fish in the Kigach River and the pre-mouth area.The size and weight indices of common carp, bream and crucian fish show that in the pre-mouth space it is higher than in the Kigach river.The spawning part of the carp, bream, and crucian fish is described by the age structure, and also shows that young fish prevailed during the spawning period.It was revealed that the main part of juvenile fish slides into the sea in the year of birth and a small number of fish remain in the river bed where it feeds and feeds. The carp found in the Kigach River had a length of 31 to 45 cm and weighed from 585 to 1782 grams. The carp population was characterized by an age difference from 3 to 8 years, and the main group of fish under 4 years old was the largest, about 46%, which indicates the sustainability of natural reproduction of fish stocks. Bream (Abramisbramaorientalis Berg). During commercial fishing in the Kigach River, in 2019, the size of bream was 22 - 31 cm, weight from 183 to 554 g. According to research in 2019, 3-4 year old fish make up 79.7%. The spawning part of carp, bream, and crucian carp is characterized by an age structure, the length and weight of which change with age, as well as the predominance of juvenile fish during spawning. Crucian carp (Carassius carassius). In 2019, it was reported that the length of the crucian carp caught in the Kigach River varied from 17 cm to 27 cm and weighed from 146 to 555 g.

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