EFFECTS OF LAMINARIA DIGITATA AND ASCHOPHYLUM NODOSSUM IN CONTROLLING WHITE SPOT DISEASE (WSD) IN (WHITE LEG SHRIMP LITOPENAEUS VANNAMEL)

Complementary feedstuff extract from Laminaria digitata and Ascophylum nodossum containing 1% alginic acids as stimulator of immune system in Litopenaeus vannamei for controlling WSSV was used in this study. The test shrimps, Litopenaeus vannamei, in larvae stage (Z1-PL1), post larvae stage (PL1 –PL10) and juvenile (from day 30 to 40) were fed by complimentary feedstuff as the other test conditions in the test and control group were the same. Both groups were exposed to WSSV after 40 days by oral inoculation. The clinical signs and mortality were recorded for 10 days. The results showed the survival rate of the test group was higher than the control group and it was significant (P<0.05). The results also showed that the mortality in the test group occurred 48 hours. Later than the control group. This study can lead us to new methods for controlling White Spot Disease.