Determination of Gross Margin in Different Stock Density of Russian Sturgeon Acipenser Gueldenstaedtii | Определяне на брутния доход при различни гъстоти на посадката за руска есетра Acipenser gueldenstaedtii
2010
Nikolov, G., National Agency of Fisheries and aquaculture, Sofia (Bulgaria) | Atanasov, A., Tracian University, Stara Zagora (Bulgaria) | Stankov, K., Tracian University, Stara Zagora (Bulgaria)
Problem statement: The main purpose of the present experiment consists in the effect on stock density of Russian sturgeon reared in different stocking densities in a recirculating aquaculture system. Approach: The influence of stocking density and water quality on the gross margin of Russian sturgeon was studied during 90 days. The three experimental variants D1,D2 and D3 were formed by three rearing units each with a different fish density: 35 fish/m3 initial average weight 19,56 g, 45 fish/ m3 initial average weight 19,06 g and 65 fish/m3 initial average weight 19,16 g. The fish were fed a 45% protein, 18% fat feed to a feeding rate of 3 % body weight/day. During experiment water quality parameters pH, О2, T, NO3 were recorded an a daily basis and, every 2 weeks, the fish were weight individually, and weight gain was recorded. Results: The optimized of stock density for Russian sturgeon in recirculation system cloud is used for minimized purchase and led to increase of the profits in the farm.
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