A HISTOPATHOLOGICAL DISEASE SURVEY OF CULTURED SHRIMP IN NORTH-EAST SUMATERA, INDONESIA

A disease survey was conducted in North East Sumatera, Indonesia, duri ng June and July 1991. The object was to obtain information regarding the diseases present in shrimp culture facilities. Shrimp were sampled for histopathological examination and details of the farm management and environment were recorded. The stocks sampled included some report ed to be suffering from disease problems and some reported to be in go od health. Samples were taken from 24 pond farms, five hatcheries and a broodstock fisherman. All farms and hatcheries cultured Penaeus mono don Fabricius, one farm also cultured Penaeus merguiensis de Mann. and two cultured Metapenaeus spp. Several wild caught P. monodon female b roodstock and some wild rice shrimp (Acetes spp.) were also sampled. T he disease conditions detected in P. monodon were monodon baculovirus (MBV), hepatopancreatic parvo-like virus (HPV), septic hepatopancreati c necrosis (SHN), bacterial septicaemia (BS), haemocytic enteritis (HE ), lymphoid organ pathology (LOP), external fouling organisms (EFO), a nd a single unconfirmed case of infectious hypodermal and haemopoietic necrosis (IHHN). The Acetes spp. from one site had a microsporidean i nfection in the striated muscle of the abdomen. EFO was the most commo n disease condition, and was identified in 16 farms and three hatcheri es. MBV was detected in 14 farms, three hatcheries and in one broodsto ck. SHN was found in 13 farms with one case of concurrent BS and LOP w as found in eight farms. HE was found in four farms and HPV was identi fied in shrimp with MBV on two farms and as the only disease in one br oodstock. The significance and implications of these findings for the developing industry in Indonesia are discussed.