Species diversity and dynamics fishery catch in Omsk region

Abstract

There are 19 species of fish were noted, however, only 11 species included in the fishing statistics. The main commercial value are fishes of the genus Carassius (Carassius carassius and C. gibelio) — 47.6% of fish catches in the region and perch Perca fluviatilis — 22.4%. Roach Rutilus rutilus, pike Esox lucius, pike-perch Sander lucioperca, bream Abramis brama, peled Coregonus peled and carp Cyprinus carpio are relatively few in catches and account for 7.4, 6.2, 4.7, 4.6, 4.6, 1.2%, respectively. The composition of the fish community, as well as their ratio in catches, is not the same for different water bodies of the Omsk region. First of all, this is due to the peculiarities of fish ecology, the diversity of water bodies and the fishing strategy for them. The main volume of fish production in the region is provided by small and medium-sized lakes, in which more than 55% of the region’s fish are caught (average over last 7 years). About 39% of all fish in the region are caught on the large lakes Ik and Saltaim-Tenis. The total volume of fish caught in the region over the past 7 years is 9.2 thousand tons, which is significantly less than the potential volume of fish production — 20.9 thousand tons. The main reasons for the underutilization of stocks are: insufficient volumes of introduction and catch of peled and carp — objects of pasture aquaculture; overfishing in some years, leading to depletion of stocks and a decrease in catches in the following periods.