INFLUENCE OF FEEDING LEVEL ON THE GROWTH OF STERLET (Acipenser ruthenus Linnaeus, 1758) IN RECIRCULATING AQUACULTURE SYSTEM

The paper is presenting aspects regarding the influence of feeding level on the breeding of sterlet in a recirculating aquaculture system (RAS). The experiment took place over 30 days, in 4 pilot breeding units of aquaria type of 300 1 in volume. Two kinds of foddering level variants were compared, with repetition: with 6 g/kg metabolic weight (1.1% from total biomas) and 12 g/kg metabolic weight (2.2% from total biomas), respectively. The stocking density was of 14 fish/unit. The parameters of fish breeding showed that changing the quantity of fodder, the fish growing was positively influenced. This experiment showed that Acipenser ruthenus is a sturgeon with a weaker growth rate than other strugeon. However, it is still possible to obtain an increase of fish biomass, between 1.2-1.5 kg/m(3), using different quantity of pellets with more than 40% crude protein.