Introduction of Alien Fish Species to Waterbodies of Uzbekistan

Totally 47 alien fish species were introduced to Uzbekistan including 23 as target and 24 as accidental. One time introduction was carried out for health care, all other were done for fisheries purposes (i) to the Aral Sea, (ii) to newly created irrigation water bodies, (iii) to aquaculture. Secondary settlement was marked for 27 species, for 20 species settlement was not found. Natural reproduction was marked for 31 species. At present 22 introduced species vanished in region, 7 species are not numerous, 20 species are numerous in water bodies. List of high value marketable fish includes 6 species, commercial 18, trash fishes 23 species. A number of introduced species did not find conditions for reproduction or could not survive and vanished. Several species survived and began to reproduce in the Aral Sea but vanished as salinity of water increased. Some species survived, but did not spread to another waterbodies. Several alien species have widely spread all over the Aral Sea basin, thats happened after introduction of far eastern fishes in early 1960s.