Kết quả thử nghiệm nuôi cá tầm theo công nghệ “Sông trong ao” tại Tỉnh Lâm Đồng

Abstract

The study was conducted in order to assesment theo growth, productivity and profit for culturing sturgeon fish in Inpond Raceway Systems. The sturgeon fishes was stocked in 3 raceway units in 3 different eathponds with size of each raceway unit of 25.0 x 5.0 x 1.8 m (125 m²) and each earthpond  area of 2,000 m². The inlet of raceway unit was buit a whitewater unit which makes water flow through the raceway unit. The siphon systerm was established at the end part of the raceway unit for collecting wastes out of the system. Fingerlings (51.1-52.4 g) was stocked with three different densities, including 10, 13 and 16 fish per m², respectively. Fhishes were feed by commercial feed with protein concentration of 44-46%, the diet of 1.5-2.5% total weight per day and times of feeding of 3-4 per day. The water flow in raceway units was maintained continuously by 6-8 times per hour. After 12 months, fish gained a size of 2.0-2.4 kg/fish, survival rate of 77.3-85.5% and this trend to reduce according to the increasing of density. Aganst, the productivity of 20-26  kg/m² and this trend to enhance according to the increasing of density.The economic efficient was relative high with the profit rate of 31.1-41.0%.

The results showed that sturgeon have quick growth and high productivity as well as good profits when they were cultured by In Pond Raceway Systems.

Keywords: sturgeon; growth; productivity.