Cytological Study on the Leukocytes of Selected Fresh Water Fishes of India

For the purpose of cytological studies and work out the correlations among the teleost fish species, some 5 fish species are selected viz Notopterus notopterus, Labeo rohita, Tilapia mossambica, Clarias batrachus, and Channa gachua. The observations regarding hematology are made from peripheral blood by traditional staining method while histological and cytological studies are done from the sections cut of the cephalokidney (head kidney). The cytological observations made through present studies don’t show any major difference among the fish species selected, except for the size of cells, which otherwise depend upon the species. The histological observations of the head kidney of fish revealed two clear-cut parts; one that of the ground matrix in which cells are found scattered and the second, which contains encapsulated lymphoid follicles, intermingled with the ground matrix. The lymphoid follicles encapsulated by dense collagenous tissue a tubercular extending from a variable distance into the follicle. Under the present investigation the cytology of all the five cells viz. lymphocytes, neutrophils, basophiles, eosinophils and monocytes have been worked out.