1987

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Nitrogen Fixing Bacteria, Azotobacter sp. in Aquatic sediments
(Society of Fisheries Technologists (India) Cochin, 1987) LAKSHMANAPERUMALSAMY, P
Non-symbiotic, free living, nitrogen fixing bacteria, Azotobacter sp. was estimated in sediments of estuarine, marine, backwater and mangrove environments of Portonovo. Number of colony forming units (CFU) of Azotobacter sp. was less (5 to 27 cells/g of dry sediment). CFU of total heterotrophic bacteria (THB), actinomycetes and fungi were between 4.1 x 106 and 4.5 x 107, 0.8 x 105 and 4.9 x 105, 1.1 x 105 and 3.8 x 105/g respectively. Mangrove sediments contained more CFU of the above microbial groups.
Spoilage bacteria of Penaeus indicus
(Society of Fisheries Technologists (India) Cochin, 1987) M, CHANDRASEKARAN; LAKSHMANAPERUMALSAMY, P; CHANDRAMOHAN, D
Bacteria isolated from raw (untreated and unprocessed) prawn (Penaeus indicus) stored at 28±2°C, 4°C and-18°C were tested for spoilage potential, namely, production of protease, lipase, amylase, reduction of trimethylamineoxide (TMAO) to trimethylamine (TMA), production of off odours from flesh broth and halo zone around the colony grown on flesh agar. About 63 % of the total isolates tested were potential spoilers. Members of Vibrio, Pseudomonas and Acinetobacter were found to be dominant potential spoilers at all temperatures