Postembryonal ontogenesis of broad whitefish and formed herd under phenol intoxication

Abstract

The paper reveals the data on comparative analysis of broad whitefish Coregonus nasus larvae in the Ob received from natural populations (lower Ob) and from fish, farmed outside their natural habitat. This fish herd was formed from fish brought from the lower Ob basin to the fish farm “Forvat” (Leningrad region), where they were bred during five generations. During a month, the embryos of broad whitefish were incubated in the conditions of Sob fish-breeding plant (Harp village, Yamalo-Nenetsk Autonomous District), then they were placed for breeding into the laboratory of the Institute of Biology of Tyumen State University. The broad whitefish embryos from artificial herd were taken to the laboratory at the stage of eye pigmentation. After hatching, the larvae in both series were found to be chronically intoxicated with phenol 1 (0.001 mg/l), 5 (0.005 mg/l) and 10 (0.01 mg/l) since their transfer to external feeding up to two months of age. The authors observed broad whitefish from artificial herd and found out increased survival rate, higher balance and lower level of hystopathological changes in all variants. Due to low biological parameters of the broad whitefish young stock, their application for stocking natural basins in the conditions of modern anthropogenic impact is not efficient. On the other hand, increased biological and toxicovigilance characteristics are more effective when being applied in the basins with high anthropogenic load with the aim to increase fish productivity.