Observations of common disease in shrimp farming area of the Mekong delta

Abstract

This study was conducted to determine the occurrence of shrimp disease in coastal area in the Mekong Delta. Samples were collected in Soc Trang, Bac Lieu and Ca Mau province. Shrimp samples with intestinal disease were observed and recorded clinical signs and tissue samples were preserved by 95% ethanol for PCR detection of bacterial pathogens. Clinical signs of infected shrimp included an empty gut or dis-continued content, an atrophied, pale hepatopancreatic. The result of parasite test detected gregagine and vermiform in gut and hepatopancreas. Bacterial isolation determined infection of Vibrio spp in affected shrimp samples. The water parameters in infected shrimp ponds including pH, temperature, salinity, concentration of ammonia and nitrite were within acceptable range for shrimp culture in all test ponds.