Association of asymptomatic mortalities in cultured white shrimp, Penaeus indicus with dominance of non-luminescent Vibrio harveyi biotypes in mariculture environment [electronic resource].

Includes references.

Asymptomatic mortalities among cultured Penaeus indicus adults and postlarvae were recorded in summer season. Two non-luminescent Vibrio harveyi biotypes (V.harveyi- 1 and V. harveyi- 2) were dominantly identified along with other bacterial species mainly Pseudomonas fluorescencs , Aeromonas hydrophila and Staphylcoccus species The incidences of recovery of V. harveyi-1 N.harveyi- 2 P.fluorescencs, A. hydrophila and Staphylcoccus spp. in infected adults and postlarvae reached 63.3 % , 26.7%, 6.7 %, 3.3 %, 0 % and 76.7%, 53.3%, 10%, 6.7%, 13.3 %, respectively. The disease condition was found to be associated with the existance of stressful environmental role expressed by the recorded increase in values of water quality parameters especially ammonia and nitrite in affected ponds. However, the incidences of recovery of harveyi- 1 , V. harveyi- 2 P.fluorescencs, A. hydrophila and Staphvlcoccus spp. in alfected pond water samples reached 93.3 %, 76.7 %, 13.3 %. 6.7% and 23.3 %. respectively.

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