The Potency of Proteolytic Bacteria as Biocontrol of Microcystis aeruginosa BT-02 in Carp (Cyprinus carpio).

Abstract

Cyanobacteria are group of phytoplankton that commonly found in bodies of fresh water all over the world. Cyanobacteria like Microcystis aeruginosa, produce microcystin (MCYST). MCYST is a monocyclic heptapeptide hepatotoxin which has cause fish mortalities. This study was conducted to know the potency of proteolytic bacteria isolated from digestive tract of tilapia fish strain GIFT which have ability to inhibit the growth of M. aeruginosa BT-02. The isolates of proteolytic bacteria which have the ability to inhibit the growth of M. aeruginosa BT-02, i.e NU-4 and NU-8 have been identified as Aeromonas. The inhibition index that produced by NU-4 (1,71) was higher than NU-8 (1,34). The inhibition mechanism is still unknown. Toxicity test revealed that there were not any carp fish die during the experiment, but there were some histological changes observed in liver and intestinal of treated carp fish with M. aeruginosa cells.