Abstract
Present investigation was carried out to reveal, the effect of parasitic infection on histology of lymphoid and pro-nephric organs of snake-headed murrel, Channa marulius. Channa marulius is one of the important commercially available edible fish in Madhya Pradesh. The histology effect of digenetic trematode on spleen and head-kidney of host fish showed loosening of splenic parenchyma, Infiltration of lymphoid cells with several and enlarged melano-macrophage centers were observed in several sections. Whereas histology changes of head-kidney was characterised by degeneration and dispersion of interrenal and chromaffin tissue and with a sign of necrosis. Therefore a conclusion can be drawn that parasites possessed necessary effect on fish immune organs, which may be due to parasitic load or intensity of infection in host fish.
