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69.09.23

Nuôi trồng thuỷ sản

Nguyễn Phương Toàn; Vũ Văn Sáng; Nguyễn Viết Vương; Nguyễn Quang Tuất; Đặng Thị Dịu; Đoàn Thị Nhỉnh; Trần Thế Mưu; Vũ Văn In; Trần Thế Mưu(1); 

ảnh hưởng của mật độ lên sinh trưởng và tỷ lệ sống của tôm chân trắng SPF nuôi thương phẩm trong bể composit trong nhà (Litopenaeus vannamei)

Effect of stocking density on growth rate and survival of white leg shrimp, Litopenaeus Vannamei, raised on indoor composite tanks

Khoa học và Phát triển

2013

2

223-229

1859-0004

Tôm chân trắng; Nuôi trồng thủy sản; Mật độ nuôi; Bể nuôi composit trong nhà; ảnh hưởng; Tốc độ sinh trưởng; Litopenaeus vannamei

The effect of stocking density of white leg shrimp SPF (Litopenaeus vannamei) was carried out at different density of 40, 60 and 80 PL 15/m2 for 75 days. Each treatment was replicated three times in 4m2 indoor composite tank system and feeding ratio of 10-15 percent body weight with CP pellets containing 38 percent crude protein and four times a day. During the experiment, water temperature varied between 28 and 31°C, whereas salinity ranged from 20-24 thousandth in biosecurity condition. Water in the culture tanks was renewed 50 percent weekly. The highest growth rate in weight was found in treatment of 40 heads/m2 (1.54 g/week), followed by 60 heads/m2 (1.47 g/week) but the rate for 30 heads/m2 (1.16 g/week) was lowest. Similarly, the survival rate of shrimp stocking at 40 heads/m2 ranked highest (79.7 + or - 2.6 percent), followed by 60 heads/m2 (78.7 + or - 2.9 percent) and the lowest rate for the 80 heads/m2 (70.3 + or - 3.3 percent; P0.05). Nevertheless, there was no significant difference in the survival rate between shrimp raised at 40 heads/m2 and 60 heads/m2 (P0.05). Size variation (CV) for 40 heads/m2 (7.27 + or - 1.52 percent) and 60 heads/m2 (8.22 + or - 2.5 percent) were considerably lower than that for 80 heads/m2 (12.9 + or - 2.7 percent; P0.05). However, there was no considerable disparity in feed conversion rate among the three treatments (P0.05). All shrimp sample tissues were found negative for WSSV, YHV, TSV, MBV and IHHNV.

TTKHCNQG, CVv261

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