Features of cultivation of hydrid forms of sturgeon fish in quarriers of the Rostov region

Abstract

The paper presents the results of growing juvenile sturgeon species and their hybrid forms in a mine pit lake in the Rostov region. In the Rostov region, there are many mine pit lake that can be successfully used to organize economic activities for the cultivation of valuable aquaculture objects, such as sturgeon fish. It has been established that the hydrochemical regime of the lake from May to September is favorable for the cultivation of juvenile sturgeon fish species and their hybrid forms. Studies have shown that the highest growth rate for 30 days of growing in pools was shown by beluga juveniles, its absolute increase was 1200 mg with a survival rate of 75%. Lenk and Bester had an increase of 565 mg and 710 mg, respectively. The most highly sensitive was the transition of juveniles to active nutrition, when the yolk sac in the larvae resolved by 2/3. The fastest transition and the least waste was observed in the larvae of bester and lenka. Upon reaching the age of 30 days, the juveniles were transplanted into cages, where good growth of beluga juveniles and hybrids was noted. On June 15 (40 days), the juveniles switched completely to dry food. At the same time, the average weight of the beluga was 3.5 g. It should be noted that with the complete transfer of beluga juveniles to dry food, the waste was from 3 to 5%. The young of Lenka and bester adapted better to dry food, the waste did not exceed 2%. The largest growth was in juveniles of all sturgeon species in August and early September.