Ảnh hưởng của độ mặn lên tăng trưởng và tỷ lệ sống của ương giống tôm sú (Penaeus monodon) theo công nghệ biofloc

Abstract

This research is aimed to find suitable salinity for growth and survival rate of black tiger shrimp postlarvae using biofloc technology. The experiment is in a completely randomized design with three replications of five treatments which are salinity of 5, 10, 15, 20 and 25‰. Molasses was used to create biofloc with the ratio of C:N = 10:1, nursery tanks with a volume of 500 litres, shrimp density of 600 shrimp/m 3 . During the 30-day rearing period, the environmental parameters, bacterial density, bioflocs were in the suitable range for shrimp growth and development. Shrimp in the treatment of 15‰ had the highest weight (0.38 ± 0.01 g), which was significnatly different (p>0.05) to the treatment of 5 and 25‰ but not to other treatments. Survival rate (95.5±2.1%) and productivity (573±13 shrimp/m 3 ) of shrimp at the treatment of 15‰ was a statistically significant difference (p <0.05) compared to the treatment of 5‰, but the difference was not statistically significant (p> 0.05) compared to the remaining treatments. The results showed that the nursing of black tiger shrimp based on biofloc technology at the salinity from 10 to 20‰ obtained good results.