Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 20, Feb. Suppl. Issue, 2018; Page No.(196-201)

ISOLATION OF MARINE ACTINOMYCETES ASSOCIATED WITH THE CARANGID FISH ALEPES MELANOPTERA, (SWAINSON, 1839) AND AN EVALUATION OF THEIR ANTIMICROBIAL ACTIVITY

AROKIASAMY ANTONIRAJA, VIRIPPIN ANANDANA, TAKSHNAMURTHY GANESANB AND AMIRSINGH GUNASINGHA

Abstract

Actinomycetes associated with marine animals are found to be important sources of a variety of medicinal products like antibiotics, anti-inflammatory, antiviral and antitumour compounds. Actinomycetes associated with carangid fish Alepes melanoptera caught from Puducherry, East coast of India was investigated under this study. Actinomycetes were isolated from three different body parts viz., muscle, gills and gut of Alepes melanoptera by phenol and heat treatment. The antagonistic activity of the distinct isolates were tested against Escherichia coli, Pseudomonas fluorescens, Shewanella putrefaciens, Vibrio parahaemolyticus, Alteromonas sp., Staphylococcus aureus and Candida sp. by cross streak method. Highest number of actinomycetes was harboured in the gills than muscles and gut samples. Among the total 299 colonies isolated during this study, 50 isolates were morphologically distinct on the basis of spore mass colour, reverse side colour, aerial and substrate mycelia formation and production of diffusible pigment. Out of these 50 isolates selected for screening 19 showed inhibitory activities against the selected fish spoilage and pathogen organisms and inhibition zones of 10-28 mm were recorded. From the present investigation it is concluded that actinomycetes associated with marine fishes are a promising source of antibacterial bioactive substances that needs to be explored further.

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