Microorganisms capable of rapid decomposition Cypermethrin to improve enviroment.


  • Isolated 27 strains of microorganisms capable of growing on the medium containing Cypermethrin (Cyper) such as  a source of only carbon.
  • Co-culture of DRL8-1, DRL1 and BAT1 in the medium increased the efficiency of cypermethrin degradation compared with a single strain. co-culture of strain DRL8-1 with strain BAT1 for the fastest and most stable cypermethrin degradation.
  • Streptomyces parvulus ĐRL8-1, Mycobacterium vaccae ĐRL1 has superior ability to degrade Cyper; (the rate of degrade reached 82,84 – 90,05% after 3 week in the medium with Cypermethrin concentration 50 mg/l); and Ochrobactrum lupini BAT1capable of completely degrading residues Cyper with concentration10 mg/l in 48 hours.
  • The combined culture of strains ĐRL8-1, ĐRL1 and BAT1 increased the ability to degrade Cypermethrin in the medium. In the research experiments; the combined culture of strains ĐRL8-1with BAT1 has the fastest and most stable degradation of decomposit Cyper.
  • When adding a mixture of two selected microorganisms to the culture medium of black tiger shrimp contaminated with Cypermethrin 0,05 ppm, has degraded 84,69 % and has a good effect on shrimp. The addition of the microbial mixture to the shrimp culture medium did not affect the growth of shrimp and reduced mortality shrimp caused by decomposit Cypern.


Fig 1. Black tiger shrimp after 10 days of experiment
(a): Control (No Cyper and No microorganisms);
(b): No Cyper and microorganisms;
(c): Cyper and No microorganisms;
(d): Cyper and microorganisms.