Autoradiography and differential hemoglobin staining as aids to the study of fish hematology

Summary The confused state of the existing knowledge regarding the cell types in peripheral blood and hematopoiesis of fishes has been highlighted. Inadequacies of techniques presently used have been pointed out and the advantages of using Graham-Knoll's method for haemoglobin staining when counter stained with Giemsa together with autoradiography using tritiated thymidine have been demonstrated.Thanks are due to the University of Rajasthan for working facilities. J.S.D. is grateful to University Grants Commission, New Delhi for grant of Research Fellowship during the tenure of which this work was done.