Kết quả thử nghiệm nuôi cá tầm theo công nghệ “sông trong ao” tại tỉnh Lâm Đồng=Results of culturing sturgeon by in pond raceway systems in lam dong province

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Tác giả: Viết Thùy Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học Công nghệ Thủy sản Nha Trang, 2025

Mô tả vật lý: tr.73-79

Bộ sưu tập: Metadata

ID: 477295

Thêm vào giỏ

Nghiên cứu này nhằm đánh giá hiệu quả về tăng trưởng, năng suất cá tầm và lợi nhuận của mô hình nuôi cá tầm thương phẩm theo công nghệ “sông trong ao”. Cá tầm được nuôi trong 3 mương xây trong 3 ao đất khác nhau, với kích thước mỗi mương 25,0 x 5,0 x 1,8 (m) (125 m2) và diện tích mỗi ao là 2.000 m2. Đầu các mương lắp đặt hệ thống sục khí tạo dòng chảy liên tục và cuối các mương có hê thống si phong thu gom chất thải. Cá tầm giống (51,1-52,4 g) được thả vào 3 mương nuôi ở 3 mật độ khác nhau, gồm 10, 13 và 16 con/m2. Cá được cho ăn cùng loại thức ăn viên chìm (skreting, 44-46 % protein) với khẩu phẩn 1,5-2,5 % W, 3-4 lần/ ngày. Trong suốt thời gian nuôi dòng chảy được duy trì liên tục qua mương với lưu tốc nước qua mương nuôi 6-8 lần/giờ và chất thải được si phong hàng ngày. Các yếu tố môi trường biến động tương đương giữa các mương nuôi và trong phạm vi thích nghi của cá tầm. Sau 12 tháng nuôi khối lượng cá tầm thu hoạch đạt 2,0-2,4 kg/con, tỷ lệ sống đạt 77,3-85,5% và có xu hướng giảm theo sự tăng mật độ. Ngược lại, năng suất cá đạt 20-26 kg/m2 và tăng theo sự tăng mật độ. Lợi nhuận ở 3 mương nuôi đạt tỷ suất 31,1-41,0%. Từ kết quả cho thấy cá tầm tăng trường nhanh và năng suất cao cung với hiệu quả kinh tế khả quan khi được nuôi thương phẩm theo công nghệ “sông trong ao”, mật độ 10-16 con/m2.The study was conducted in order to assessment theo growth, productivity and profit for culturing sturgeon fish in Inpond Raceway System. The sturgeon was stocked in three raceway units in 3 different eathponds with size of each raceway unit of 25.0 × 5.0 × 1.8 m (125 m-2) and each earthpond area of 2,000 m-2. At the beginning of the raceway unit, an aeration system was installed to create a continuous flow and at the end of the unit, a siphon system was installed to collect waste. Fingerlings (51.1-52.4 g) was stocked with three different densities, including 10, 13 and 16 fish.m-2. Sturgeon was 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. During the rearing period, the flow is maintained continuously through the system 6-8 times/hour and the waste is siphoned daily. After 12 months of farming, the harvested sturgeon weight reached 2.0-2.4 kg.fish-1, the survival rate reached 77.3-85.5% and tended to decrease with increasing density. In contrast, fish productivity reached 20-26 kg.m-2 and increased with increasing density. The profit rate in the 3 raceway unist reached 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 System, with a density of 10-16 fish.m-2.

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