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1 Chemia i Inżynieria Ekologiczna

1 2002

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Effects of Heavy Metals on the Bacteriocenoses of the Digestive Tract of Fish

Syvokiene J., Mickeniene L.

Chemia i Inżynieria Ekologiczna

2002

Vol. 9, nr 9

1033-1038

The effects of heavy metals mixture (Cu, Ni, Cr, Zn and Fe) of 1% and 10% concentrations were investigated on the bacteriocenoses structure, the abundance and functional activity of bacteria of the digestive tract of rainbow trout underyearlings. It was determined that heterotrophic bacteria predominated in the bacteriocenoses of the digestive trace of rainbow trout. Under the influence of the metal mixture the qualitative and quatitative composition of the bacteriocenoses in the digestive tract of the rainbow trout underwent a change. The results obtained indicated that after the exposure to I and 10% concentration of heavy metals mixture viable count of heterotrophic bacteria decreased from 1.5 to more than 6 limes compared to the control. Under the exposure to heavy metals mixture the percentage ratio of proteolytic bacteria in the digestive track of rainbow trout increased.

Mieszanina metali ciężkich powoduje znaczne ilościowe zmiany w bakteriach grup funkcyjnych prawidłowej (normalnej) mikroflory przewodu pokarmowego pstrągów.