Effect of environmental temperature on fecundity of Rutilus rutilus (L.) (Cypriniformes, Cyprinidae) in different types of water bodies in southern Western Siberia

The data on individual absolute and relative fecundity, and gonadosomatic index of roach Rutilus rutilus (L.) from different types of water bodies in southern Western Siberia: Lake Chany, the Novosibirsk Reservoir, and the Middle Ob are presented. The reproductive capacity of R. rutilus is vary widely and increase with age and size of female species. The roach from Lake Chany exhibit higher reproductive capacity compared to the Novosibirsk Reservoir and the Middle Ob. Furthermore, same-age roach specimens from Lake Chany and the Middle Ob have significant interannual differences in the reproductive indicators. The individual absolute fecundity of roach is statistically significantly related to water temperature at onset of oocytes trophoplasmic growth in the previous year, which occurs in mid-June in Lake Chany and mid-July in the Middle Ob.