RESEARCHES CONCERNING THE GROWTH OF THE SIBERIAN STURION (ACIPENSER BAERII BRANDT, 1869) IN THE PONDS FROM THE MOLDOVA AREA

E.G. Naşcu, M.C. Cioran, B. Păsărin

Abstract
    This study presents aspects related to the technology of growth of the Siberian sturgeon, in semi-intensive system, and its ability to adapt to the conditions of the fishing facilities in the area of Moldova. Researches has spread over a longer period of about 18 months, including wintering in the pond where they were introduced and raised. The biological material consisted of 1,000 seedlings with an average weight of 5.3 g / piece, stored in a 500 m² pond, resulting in 2 pcs / m². During the period prior to flooding and stocking, the pond was properly prepared by maintenance and disinfection. A constant flow rate of water of 200 liter / min was ensured and at the level of the spillway, the water outlet was provided with a small mesh sieve (5x5 mm), knowing the sturgeon's tendency to migrate over the water streams. Monthly fishing was conducted to determine the growth rate and health status of sturgeon juveniles. The first stage of the study began on 19.04.2016, when the pond was populated with biological material and ended on 30.09.2016, when the water temperature did not allow the feeding of the sturgeon juvenile, and in this case they were prepared for wintering. The second phase of the research theme has evolved since 03.04.2017, ending in the first decade of October, exactly on 08.10.2017. This study was carried out within the private farm, "Valea Morii Farm". The administration of the extruded combined feed was carried out using a feeding system and in the first growth stage ,increase in 5 portions / day of the total amount of feed, after which it was reduced to 3 portions / day and maintained at that time until the end of the research. Throughout the experimental period, all physico-chemical parameters of the water were monitored and samples were periodically collected for chemical analysis.

Key words: fish, siberian sturgeon, semi-intensive, fodder