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Some research results on acute Hepatopancreatic necrosis disease in shrimp cultured in MeKong Delta and initial solutions

FRIday - 21/11/2014 02:20
This study was conducted to determine the evolution of AHPND in shrimp cultured in pond and in laboratory conditions. The prevention solution is proposed based on these results.

Histopathological method was used to analyse 51 shrimp samples collected periodically every 10 days and 36 samples collected at disease outbreak. The earliest and latest signs of necrosis appeared on day 17 and 77 after stocking respectively. The highest frequency of necrosis appearance was recorded from 20 to 45 days after stocking. Mortality was concentrated in the period of 19-31 days of age. All shrimp samples collected at outbreak showed high prevalence of necrosis and lead to early harvesting after 2-3 days of necrosis detecting. It is interesting that the high variation of necrosis rate have been recorded between ponds (9-90%). This result shows the severity of AHPND although only low necrosis rate was detected. The early harvesting has been applied in all shrimp ponds with signs of necrosis. Shrimp form the slightly infected pond can survive in the labolatory condition for one month when water parameters were controlled. Monotring of Vibrio sp. and V. parahaemolyticus in the water and in the shrimp body seems to be important in control of AHPND. Based on this result, the farmers can decide the solution at certain periods.

Nguyen Van Hao
Research Institute for Aquaculture No2

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