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Diseases of Aquatic Organisms

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DAO 68:39-45 (2005)  -  doi:10.3354/dao068039

A marine bacterium, Micrococcus MCCB 104, antagonistic to vibrios in prawn larval rearing systems

N. S. Jayaprakash1,3, S. Somnath Pai1, A. Anas1, R. Preetha1, Rosamma Philip2, I. S. Bright Singh1,*

1Centre for Fish Disease Diagnosis and Management, School of Environmental Studies, and 2Department of Marine Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin University of Science and Technology, Lake Side Campus, Fine Arts Avenue, Cochin 682016 Kerala, India
3Present address: Centre for Bioseparation Technology, Vellore Institute of Technology, Vellore 632 014 Tamil Nadu, India
*Corresponding author. Email:

ABSTRACT: A marine bacterium, Micrococcus MCCB 104, isolated from hatchery water, demonstrated extracellular antagonistic properties against Vibrio alginolyticus, V. parahaemolyticus, V. vulnificus, V. fluviallis, V. nereis, V. proteolyticus, V. mediterranei, V. cholerae and Aeromonas sp., bacteria associated with Macrobrachium rosenbergii larval rearing systems. The isolate inhibited the growth of V. alginolyticus during co-culture. The antagonistic component of the extracellular product was heat-stable and insensitive to proteases, lipase, catalase and α-amylase. Micrococcus MCCB 104 was demonstrated to be non-pathogenic to M. rosenbergii larvae.

KEY WORDS:Vibrio · Micrococcus · Antagonism · Macrobrachium · Probiotic

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