РЕПРОДУКТИВНАЯ СПОСОБНОСТЬ САМОК GASTEROSTEUS ACULEATUS LINNAEUS, 1758 СРЕДНЕГО ДНЕСТРА

Нина ФУЛГА, Ион ТОДЕРАШ, Дмитрий БУЛАТ, Денис БУЛАТ, Надежда РАЙЛЯН Институт зоологии АН Молдовы

Abstract

REPRODUCTIVE CAPACITE OF GASTEROSTEUS ACULEATUS LINNAEUS, 1758 FEMALES FROM MIDDLE NISTRU In the context of middle Dniester the three-spined stickleback female spawn three portions of eggs. The ovulation of the fourth generation of eggs in the current breeding season does not occur due to the lack of conditions for the completion of trophic substances accumulation. Before sweeping the next generation oocytes the value of gonadosomatic index is significantly decreasing (P≥0.95), which indicates a decrease in the relative weight of the ovaries and in the number of yolk oocytes, forming the second and third generation of the eggs of the given breeding season. The value of absolute fecundity of females significantly increases with the length and weight of the fish's body (P≥0.95), while the value of the relative fertility significantly decreases with increasing of age of producers (P≥0.99). Keywords: oocyte, gonadosomatic index, fertility, gonad age of maturity.