Ichthyological studies of fishery reservoirs in the lower reaches of the amudarya

In the past, Karakalpakstan was considered a "Lake district" and historically represented unique habitats for many species of flora and fauna. In the 30s of the last century, there were more than 140 large lakes in the Amu Darya Delta with a total area of about 600 km2. With the reduction of the Amu Darya river runoff and the inflow of water into the lower reaches, the studies were continued in terms of identifying changes in the hydro regime of the Aral and the river, changes in their ichthyofauna, distribution, biology and migrations of fish in the sea and coastal zone.