BFT (Biofloc Technology) has been currently applied in Cantho University to a number of targeted species from fresh-to marine and saline water species in the Mekong Delta, e.g. striped catfish (Pangasianodon hypophthalmus), white leg shrimp (Litopenaeus vannamei), tiger shrimp (Penaeus monodon) and Artemia Vinhchau strain (Artemia franciscana) for both in the lab-scales or production scales. The best growth and survival rate of striped catfish was obtained in 6‰. For white leg shrimp, the results indicated: (1) C (Carbon) source e.g. rice-flour or molasses supplementary based on the feed provided to promote survival, growth and shrimp biomass harvested; (2) it was fed less than 20% as usual but showed similar to those in the control; (3) combination of rice-flour and molasses at a ratio of 70:30 by weight of C and N (Nitrogen) in a ration of 15:1 enhanced shrimp survival and growth; (4) in intensive culture, shrimp could be against the infection of disease and end up with higher survival, growth in earthen ponds. For tiger shrimp, a set up for larvae till post larvae at different ratios of C and N and C:N of 30 PL15 displayed with better survival rate (49.73 ± 7.07%) and production (74,596 ± 10.608 PL/m 3 ). Artemia franciscana was set up at C:N = 10:1 and salinities from 35, 60, 80 and 100 ppt. After two weeks, there were no significant difference among treatment and the control (without biofloc) in term of survival and growth. Moreover, total embryos per female was not significant different with the control and even the number of embryos as cysts tended to be higher. BFT displayed its advantages when applied on culture system of different targeted species and there is no doubt that it could help to sustain aquaculture and save environment in the Mekong Delta in near future.
Nghiên cứu nhằm xác định bổ sung đường cát để đạt tỷ lệ C/N thích hợp cho tăng trưởng và tỷ lệ sống của ấu trùng và hậu ấu trùng tôm thẻ chân trắng. Thí nghiệm gồm 5 nghiệm thức bổ sung đường cát với tỷ lệ C/N khác nhau là 10; 15, 20, 25 và 30, mỗi nghiệm thức được lặp lại 3 lần, mật độ 150 con/L, độ mặn 30 ‰, bể ương có thể tích 0,5 m3. Kết quả nghiên cứu cho thấy chiều dài PL-12 (10,53±0,07 mm) cao nhất ở nghiệm thức bổ sung đường cát để đạt tỷ lệ C/N=20 khác biệt có ý nghĩa thống kê (p>0,05) so với nghiệm thức C/N=10 và C/N=15. Tỷ lệ sống (60,9±1,4 %) và năng suất (91.449±2.094 con/m3) của PL-12 cao nhất ở nghiệm thức bổ sung đường cát C/N=20, khác biệt có ý nghĩa thống kê (p<0,05) so với các nghiệm thức còn lại. Nghiên cứu cho thấy rằng bổ sung đường cát để đạt tỷ lệ C/N=20 trong ương ấu trùng tôm thẻ chân trắng theo công nghệ biofloc là tốt nhất.
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