In Dogfish (Scoliodon), the respiration is aquatic, since the animal resides in water. It breathes by means of gills borne in a series of gill-pouches on either lateral side of the pharynx. Water enters the mouth and after passing through the buccal cavity, pharynx, gill- pouches bearing gill-lamallae, goes out through the external gill-slits after bathing the gills. Respiratory Organs: [...]
In this article we will discuss about the urinogenital organs of dogfish (scoliodon) with the help of suitable diagrams. In all the vertebrates the excretory and reproductive organs are closely related to each other and are, therefore, dealt together. The two systems together are known as urino- genital system and the organs as urinogenital organs. In Dogfish (Scoliodon), the sexes [...]
In this article we will discuss about:- 1. Origin of Dogfish 2. Systematic Position 3. Distribution 4. Habits and Habitat 5. Economic Importance. Origin of Dogfish: Pisces (Fishes) are aquatic, cold blooded vertebrates that breathe by means of gills and live in water. There are about 30,000 to 40,000 species of fishes differing widely from each other in shape, size, [...]