HISTOLOGICAL CHANGES OBSERVED IN THE TISSUES OF CIRRHINUS MRIGALA EXPOSED TO OIL EFFLUENT

Author(s): C. Kamaraj and *K. Thamilmani

Abstract: The present investigation was to estimate the acute toxicity of oil effluent on Cirrhinus mrigala and to assess the lethal levels. The 120 hrs median lethal concentration of oil effluent were found to be 20ppt for Cirrhinus mrigala. Further experiments were conducted with sub lethal concentration of (1/10th conc. of LC50) oil effluent which were evaluated from the LC50 value. After treatment the fishes were reared in ideal condition, then sacrificed dissected at different predetermined interval during the accumulation period, (i.e.) 1st day to 20th day for Cirrhinus mrigala in oil effluent treatment for histological studies. The Histological changes were carried out under sub lethal concentration of (1/10thconc. of LC50) effluents in Gill, Liver and Muscle. The following changes occur; the primary and secondary gill lamellae were affected. The photomicrograph of muscle depicted pronounced intramuscular odema with minor dystrophic changes. The liver showed varied degree of hepatic cirrhosis as evidenced by vacuolization, space formation and resulting haemorrhage.

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