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The Clam (Galatea paradoxa Born 1778) is a dermesal dweller of riverine water and filter feed by passing water through gut concentrating particulate matter including bacteria in the gut and mantle. Microbial profile of contaminating bacteria and their sensitivity to gamma irradiation (0-20 kGy) were ascertained in vivo and in vitro under laboratory conditions. Conventional cultural and morphological characteristics were used to detect the resident Total Aerobic Bacteria (TAB), Total Heterotrophic and Total Coliform bacteria (TC) populations in the clam and the species encountered were confirmed using biochemical methods and the API 20E identification kit. Twenty (20) bacteria species in the samples belonged to 18 genera

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