000			nam a22 7a 4500
999			_c9704 _d9704
003			OSt
005			20190127110041.0
008			181214b xxu||||| |||| 00| 0 eng d
040			_cNARA
100			_917960 _aJayasinghe, J.M.P.K.
245			_aDisease Outbreaks in the Shrimp Culture Graw-out System of Sri Lanka
260			_aScotland, _c1993, _bInstitute of Aquaculture,
300			_a336-349p.
440			_917962 _aTropical Agriculture Research _n; Vol.5
505			_aDisease outbreaks in shrimp culture systems of Sri Lanka has resulted in a 35 to 70% reduction in production at farih Sites. Several critical water quality parameters (Salinity: 2-31 ppi; sulphides: 0.24-0.67 mg/l; Nitrites: 09-36 mg/l; total suspended solids: 80-160 tng/l) in the main water source (Dutch canal) were at sub-optimal ranges during disease outbreaks. Microfouling on shells, reduced moulting, black gill syttdrome were the most commonly recorded symptoms. Infestations by Monodoh BacUlovirus (MBV) and peritrichous edocommensal Zoothamnium sp. were common in affected farms. Accumulation of iron in-between gill lamellae and on litnellat cuticle was" confirmed by Scanning Electron Micrography (SEM),, Transmission Electron Micrography (TEM) and by histochemical studies, p Several hlsto- pathological changes were obsen’ed in gill, hepatopancriatic andhtydcdrdial tissues.
942			_cRP _2ddc