In this article we will discuss about:- 1. Origin of Rohu Fish 2. Systematic Position 3. Distribution 4. Economic Importance. Origin of Rohu Fish: Class Osteichthyes (Gr., osteon = bone + ichthyes = fish) includes the ray-finned "bony fishes", both marine (e.g., cod, sole, herring, eels) and freshwater. Subclass Actinopterygii of class Osteichthyes are the commonest vertebrates of today. Its [...]
Digestive system includes the alimentary canal and the associated digestive glands. Alimentary Canal: The alimentary canal is a long tube comprising mouth, buccal cavity, pharynx, oesophagus, stomach, intestine and rectum. 1. Mouth: The mouth is a sub-terminal crescentic slit bounded by fleshy upper and lower lips. These lips bear four or five rows of conical papillae. 2. Buccal Cavity: The [...]
Like that of the cartilaginous fishes, blood vascular system consists of a "single circulation." Blood: It consists of the fluid part, plasma and blood corpuscles. Erythrocytes are elliptical and nucleated with haemoglobin. Besides erythrocytes, nucleated reticulocytes and thrombocytes, as well as coarse and fine granulocytes and various lymphocytes occur. Haematopoiesis occurs chiefly in teleosts in the kidney intertubular tissue and [...]