Effects of activate DA on growth, survival and the total number of bacteria and Vibrio spp. in rearing of Pacific white shrimp (Litopenaeus vannamei)

A study on the effects of activate DA on growth and survival of Pacific white shrimp (Litopenaeus vannamei) was conducted under laboratory conditions. Tests were carried out in seven treatments (with five replicates/treatment). Post larvae 12 (PL12) were stocked into 500-liter fiberglass tanks at a density of 50 PL/tank. Salinity during the experimentation period was 25 ppt. Shrimp were fed four times daily with pelleted feed containing activate DA at different levels, namely 0.1, 0.2, 0.4, 0.8, 1.2 and 1.6%, and a control treatment which did not contain activate DA. After 60 days of dietary administration, shrimp fed with 1.2% of activate DA had an average body weight of 6.87+ 0.27g, which was not significantly higher (P>0.05) than those of shrimp fed with 1.6% (6.47+0.24g) of activate DA. However it was significantly higher (P