ARTIFICIAL REPRODUCTION OF INCONNU IN KRASNOYARSK TERRITORY

Abstract

The first results are given from the work with the fish populations of inconnu Stenodus leucichthys nelma (Guldenstadt, 1772) from the Yenisei river basin. Investigations were carried out at the Scientific Research Institute of Ecology of Fishery Reservoirs, Krasnoyarsk. To increase the number of this fish species within the area and its commercial cultivation, we suggest using the industrial methods for inconnu reproduction in the warm water with the use of artificial feeds. It is shown that the temperature regulation during incubation shortens incubation periods. With that, it is possible to obtain inconnu larvae by the end of February. When fed intensively, the juveniles reach 10 g weight by June. Stocking of water bodies with grown-up juveniles may be variable: one-year feeding grounds in small lakes or ponds with low-value aboriginal ichthyofauna (leucaspius, roach, perch, ruff, etc.) to produce fingerlings; stocking the Yenisei to maintain natural reproduction; pasture fish farming in the reservoirs of the Angara-Yenisei cascade. We provide the data on the formation of a repair inconnu herd, and its maintenance in pools with artificial feeds. In the fifth year of cultivation, the average fish weight in the established herd reaches 3.72 kg. We discuss the use of inconnu as a biological improver in the reservoirs of the Angara-Yenisei cascade. The introduction of this fish species as a biological improver will result in the elimination of ordinary fish, and weaken interspecific and intraspecific competitive relations in the basin. The equation of inconnu spawn incubation periods depending on water temperature is given.