Synopsis Ichthyology, the study of fishes is one of the popular branches of natural History; the reason being probably that the element in which fishes live, prevents their peculiarities and habits being brought so prominently than that of those of creatures living on dry land. The present publication is being prepared by keeping in view the requirements of the students and teachers of several universities. It explains the identification o fishes; principle fisheries; preservation, processing, transporting and marketing of fishes alongwith food and feeding methods in fishes. The book further discusses about types of fisheries; bye-product of fish industry; age-growth and length-weight relationship; effects f pollution in fishes; fish pathology And immunology in fishes etc.