Effects of dietary chitin supplementation on the resistance of white leg shrimp (Litopenaeid vannamei) to Vibrio parahaemolyticus
Abstract
Evaluation of the protective of dietary chitin supplementation to Vibrio parahaemolyticus in white leg shrimp Litopenaeus vannamei was performed with 6 treatments. Shrimp (mean weight 1.74 ± 0.22g) were fed diets supplemented with chitin at concentrations of 0%, 0.1%, 1%, 2%, 4% and 8% in triplicate for 2 weeks. Shrimp in all treatments were challenged by adding V. parahaemolyticus at the dose of 104,54cfu/mL directly to the culture tank. The experimental results showed that the cumulative mortality of the white leg shrimp in the treatment fed with 1% and 2% chitin supplement were 25% lower (P = 0.002) than the cumulative mortality of shrimp in the control treatment. There was no difference in cumulative mortality of white shrimp in the remaining treatments compared with control treatment (P>0.05).
