RESEARCHING ON SOME GROUPS OF STARCH - DEGRADING MICROORGANISMS IN SHRIMP CULTURE PONDS AT SAM - CHUON LAGOON, PHU VANG DISTRICT, THUA THIEN HUE PROVINCE

Abstract

    Currently, the water quality at many shrimp ponds in Tam Giang-Cau Hai lagoon is being declined. Thus, assessing and selecting the indigenous microorganisms with high ability to degrade organic materials as well as the production of  bio-preparations for treating shrimp ponds possess a practical and scientific significance. 

          From some sludge samples of many shrimp ponds, we isolated V94 bacterial strain and X65 actinomycetes strain having high ability to degrade starch. Results showed that the optimal growth times for V94 and X65 were 72 and 108 hrs, respectively; the pH, temperature and concentration of NaCl for their optimal growth were neutral to low pH, 30-35⁰C and 0,5 - 15‰, respectively. Both strains also had the ability to strongly degrade protein, cellulose and lipid. Moreover, X65 strain had the ability of antibacterian to 5  microorganisms especially two shrimps pathogens, Vibrio sp. and Vibrio parahaemolyticus.