FISHERIES RESEARCH INSTITUTE,MOA,TAIWAN

Intensive cultivation of white shrimp (Litopenaeus vannamei) was conducted in 6 individual 0.978-ton tanks with an average weight of 0.0006 ± 0.0001 g (PL5) and density of 8,580 individuals (ind.)/m2. The growth rate was 0.064 g/week, the mean weight was 0.386 ± 0.258 g, the harvested biomass was 1.98 kg/m2, the survival rate was 59.8%, the estimated shrimp number was 5,130 ind./m2, and the feed conversion ratio (FCR) was 1.3 for pond shrimp harvested after 43 days. The water quality parameters were maintained at a water temperature of 20.4 to 28.6 °C, a salinity of 27.1 to 39.4 ppt, a pH of 7.16 ~ 7.35, and a dissolved oxygen level of 2.37 ~ 6.20 mg/l during the growth trial. Three kinds of nitrogen wastes, un-ionized ammonia-nitrogen (NH3-N), nitrite-nitrogen (NO2-N), and nitrate-nitrogen (NO3-N), were evaluated, and ranged 0.006 ~ 0.014, 0.07 ~ 0.92, and 5.80 ~ 17.96 mg/l, respectively. Viable counts of Vibrio in the pound water were 1.11 × 104 to 6.26 × 104 CFU/ml, and 5.13 × 103 to 1.10 × 106 CFU/g as revealed in the hepatopancreas.