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, [...]
The locomotion of fishes has been explained by Breder (1926) and Gray (1933). By taking a series of photographs at definite intervals of time of a swimming fish against a background marked with a graduated scale. Gray has been able to record: (a) The motion of the body of the fish relative to the surrounding water, and (b) The movements [...]