A. PATIL BALKRISHNA
Abstract
The toxic effect of HM mixtures (Cu, Zn, Ni, Cr, Fe) was investigated on microorganisms of GI tract of M. monoceros and F. indicus. The results indicated that the mixtures of HM have an injurious effect on the qualitative and quantitative composition of bacteriocenosis in the GI tract of M. monoceros and F. indicus towards decrease of their numbers. Viable counts of bacteria decreases in the GI tract after exposure to the individual mixture. Under its influence the qualitative composition of bacteriocenosis in the GI tract undergone change percentage ratio of starch-hydrolysing bacteria increased in the GI tract of investigated prawns. The proteolytic bacteria were very sensitive to the HM mixture are observed. The mixture reduced the diversity of bacteria in the GI tract of prawn. The Bacterial population of the genera flavobacterium, micrococcus and of the family Enterobacteriaceae disappeared from the bacteriocenosis of the GI tract.