STUDY REGARDING THE CAPACITY OF STURGEON ADAPTATION IN FISHERY DEVELOPMENTS IN THE MOLDAVIAN AREA

E.G. Naşcu, M.C. Cioran, B. Păsărin

Abstract
   By approaching this theme, I have been looking at the way and the capability of adapting several species of sturgeons from the family Acipenseridae, Siberian sturgeon - Acipenser baerii, Acipenser gueldenstaedtii, mackerels - Acipenser stellatus and starlet - Acipenser ruthenus, to the environmental conditions of fish facilities in the area of Moldova. The biological material subjected to this study was represented by four species of sturgeon, of which three native species (sturgeon - A. Gueldenstaedtii in 200 pieces with an average weight of 10 gr./p., Mackerels - A stellatus 100 pieces with an average weight of 70 gr./p. and Starlet- A. Ruthenus, 100 pieces with an average of 38 gr / piece), and an imported species (Siberian sturgeon - A. Baers, 200 pieces with an average weight of 30 gr / p). For the study to be relevant, as regards adaptation and acclimatization, sturgeon brood was distributed in a single basin with a total area of 500 m² and a depth of 1.5 m to simulate the same growth conditions in terms of media parameters. Monthly control fishing has been carried out to determine the growth rate and the adaptability of sturgeon brood, but also to correct any possible mistakes during the growing season. The proposed research started on 10.05.2015 and took place for a period of 175 days, unti 31.10.2015, at my private fish farm, called "Valea Morii". At the beginning of May, when the water reached 14°C, after the basin was prior prepared, it was flooded, ensuring a constant flow of water of 50 l / min. The administration of extruded combined fodder was done three times a day, in the morning, at noon and in the evening, at a table marked with a pointer pillar. During the study, environmental conditions were monitored by sampling for chemical analyzes.

Key words: fish, sturgeon, feed, adaptation