000			nam a22 7a 4500
999			_c9414 _d9414
003			OSt
005			20181226133800.0
008			181214b xxu||||| |||| 00| 0 eng d
040			_cNARA
100			_917534 _aCorea, A.S.L.E.
245			_aBacterial Cultures, Immuno Enhancers & Feed Supplements in Shrimp Culture: Have they been Really Effective?
260			_c2007, _bSri Lanka Association for Fisheries & Aquatic Resources, _aSri Lanka,
300			_a1p.
440			_917548 _aProceeding of the Eighth Annual Sessions of the Sri Lanka Association for Fisheries and Aquatic Resources
520			_aSince the devastating effects of white spot disease, shrimp farmers have been trying out various methods to beat the White Spot Virus (W SV). The use of bacterial cultures, feed supplements and immuno- enhancers have, therefore, become popular as a preventive method. A survey was carried out to investigate the effectiveness of these additives. The survey revealed that 58% farmers used bacterial cultures in grow out ponds. Twenty one percent had no idea of its actual effect. Twenty seven percent used bacterial cultures according to the instructions given on the pack. Fourteen percent carried out regular water exchange even after using them, but, 6 % were able to maintain water quality in ponds without any water exchange for 14 weeks by using them. However 6 2% were affected by the W SV even after using bacterial cultures to treat water. There was no significant difference (X^ test) in the occurrence of black gills, soft shell, and blisters and lesions on the body. However, occurrence of fouling organisms and tail and antennule rot were significantly low in those using water treatment with bacterial cultures. Use of immuno-enhancers included use of vitamins, squid oil etc. and were used by 55% farmers and 6 8 % has been affected by W SV while using these. Other feed supplements used included egg 38%, raw fish 4%, fish meal 3%, mussel meat 3%, and chicken 2 % . However, 91% of these farmers using raw feed supplements have been affected by W SV. This survey revealed that most farmers did not have proper technical advice on using bacterial cultures or feed supplements.
700			_917547 _aJayasinghe, J.M.P.K.
942			_cRP _2ddc