Studies on luminous, Vibrio harveyi associated with shrimp

culture system rearing Penaeus monodon

 

E. Kannapiran*¹, J. Ravindran², R. Chandrasekar³ and A. Kalaiarasi³

¹ Alagappa University, Directorate of Distance Education, Karaikudi  - 630 003, India

²National Institute of Oceanography, Regional Centre, Dr. Salim Ali Road, Ernakulam - 682 018, India

³Department of Oceanography and Coastal Area Studies, Alagappa University, Thondi - 623 409, India

(Received: March 13, 2008; Revised received: November 15, 2008; Accepted: November 21, 2008)

 

Abstract: Microbiological studies in a modified extensive shrimp culture system at Nambuthalai, southeast coast of India were carried out for a period of 120 days. Population dynamics and distribution profile of luminous bacteria and total heterotrophic bacteria in the water, sediment and animal samples were monitored. Luminous bacteria associated with exoskeleton, gills and gut were isolated and quantified. The total heterotrophic bacterial counts ranged from 1.3 x 10⁴ to 25.3 x 10⁴ CFU ml^-1 in water and 1.5 x 10⁶  to 26.2 x 10⁶ CFU g^-1 in sediment. The V. harveyi population density varied between 0.6 x 10⁴ and 8.8 x 10⁴ LCFU ml^-1 in water and from 1.2 x 10⁶ to10.4 x 10⁶ LCFU g^-1 sediment respectively. The gut of the animal was found to harbor high density of V. harveyi than gills and exoskeleton. The total heterotrophic bacteria and V. harveyi population density showed increasing trend during the culture period.  The high V. harveyi density observed in this study at the end of the culture period correlated with the outbreak of white spot disease.

Key words: Luminescent bacteria, Vibrio harveyi, Shrimp culture, White spot disease

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