Aquatic mycelial organisms, especially actinomycetes were isolated from different sites of Dhaka Metropolitan City and Sunderban (Khulna) area. From a total of 39 isolates, 30 were studied in detail and their provisional identification was attempted. Out of 30 isolates 27 were found to belong to the genus Streptomyces and the remaining three were the members of 3 different genera viz. Pseudonocardia, Microbispora and Saccharomonospora. The adaptive nature of the isolates to the aquatic habitat were examined and it was found that most of the mycelial organisms when grow under submerged...