THE INFLUENCE OF FEEDING INTENSITY ON GROWTH PERFORMANCE OF ACIPENSER STELLATUS (PALLAS 1771) JUVENILS
V. Cristea, Maria Desimira Dicu, Lorena Dediu, Marilena Măereanu, M.T. Coadă
This paper presents a experiment regarding the influence of feeding intensity over intensive growth performance of juvenile sturgeon (Acipenser stellatus, Pallas 1771), 5 months old. The experiment was held in a recirculating aquaculture pilot system (RAS). Experimental period was 30 days. The material was stored in four growing units with a volume of 300 liters each. Two variants were compared V1 (B1, B3) and V2 (B2, B4), with repetition. Same type of feed, (Nutra Pro MP-T) -1.7 mm was given, with 50% protein content. The stocking density was identical in B1, B3, B4 -15 fish/tank (46g/fish) and 14 fish/tank in B2 (47 g/fish). Based on an algorithm derived from species growth equation, the daily amount of feed was calculated as follows: V1-1.1% feed from total biomass (6g/kg metabolic weight) and a double amount of feed in V2-2.2% from total biomass (12g/kg metabolic weight). At the end of the experiment, the increased growth rate and daily growth rate (DGR) recorded in V2 is 2.79 times higher than the ones recorded in V1, by administrating only a two times higher quantity of feed. SGR indicates a ratio, 1.2 higher, between the experimental variants. In conclusion, the main growth performance indicators (total growth rate, DGR, SGR, FCR) are superior to this stage of evolution for this species, at higher intensities feeding rates.
Key words: Stellate sturgeon, feeding intensity, RAS