Hiệu quả sử dụng nước muối biển nuôi sinh khối Artemia trong hệ thống biofloc

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Tác giả: Thanh Tới Huỳnh, Thị Hồng Vân Nguyễn, Văn Hòa Nguyễn

Ngôn ngữ: Vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học (ĐH Cần Thơ) 2021

Mô tả vật lý: 177-185

Bộ sưu tập: Metadata

ID: 411197

Thêm vào giỏ Liên kết toàn văn

Trong thí nghiệm này, Artemia được nuôi bằng nước biển và nước muối với hai phương thức có và không có ứng dụng biofloc, kết hợp của hai nhân tố này cho ra tổ hợp gồm 4 nghiệm thức (NT)với ba lần lặp lại cho mỗi NT. Artemia được nuôi trong các bể nhựa 60 L chứa 40 L nước nuôi, mật độ 500 nauplii/L, độ mặn 30‰ và được theo dõi trong 20 ngày. Trong hai ngày đầu, Artemia được cho ăn tảo tươi Chaetoceros sau đó thay thế bằng thức ăn cho Artemia. Đối với các NT ứng dụng biofloc, rỉ đường được thêm vào bể nuôi từ ngày thứ 5 và tuần tự bổ sung sau đó theo hàm lượng TAN trong nước. Kết quả cho thấy tỷ lệ sống, tăng trưởng tương tự giữa các NT sau ngày nuôi thứ 7. Sức sinh sản và sinh khối thu bị ảnh hưởng bởi ứng dụng biofloc và Artemia có khuynh hướng sinh trứng (79%) khi nuôi ở nước biển có biofloc. Các NT biofloc có lượng sinh khối thu cao hơn nuôi bình thường (3,52 g/L so với 3,24g/L p<
0,05) nhưng lại tương đương giữa nước biển và nước muối (3,30 g/L so với 3,45 g/L).Thêm vào đó, ứng dụng biofloc tiết kiệm được 20% nước thay và 14% thức ăn so với nuôi bình thường còn sử dụng nước muối làm giảm 46% giá thành sinh khối và tạo thế chủ động cho người nuôi., Tóm tắt tiếng anh, In this study, Artemia was cultured in seawater and sea-salt medium with and without biofloc application. The two- factorial experiment produced 4 treatments and there were 3 replicates for each. Artemia was reared in 60 L plastic tanks, containing 40 L culture medium with a density of 500 nauplii/L, salinity 30‰ and lasting for 20 days. In the first two days after stock, Artemia was fed with fresh Chaetoceros algae, and after that till the end of experiment, formulated feed was used as daily food. In biofloc treatments, the C/N ratios were regulated by adding molasses into the Artemia culture medium based on TAN concentration from the 5th day. Results from experiment showed that survival rate, growth rate were more or less similar between the treatments after the 7th day. Fecundity and harvested biomass were influenced by the biofloc application, but the reproduction mode was affected by both experimental factors, and Artemia tend to produce cysts in biofloc combined with seawater (79%). The biomass collected in biofloc tanks was significantly higher than that in normal culture (3.52 g/L vs. 3.24 g/L p<
0.05), but it was similar between seawater and sea salt medium (3.30 g/L vs. 3.45 g/L). Moreover, the biofloc application also saved 20% of water exchange and 14% of feed compared to normal culture, and using of sea salt instead of seawater not only decreases about 46% in biomass cost, but also gives an initiative to the culturists according to their needs.

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