In this article we will discuss about osmoregulation in various kinds of fishes. According to habitat, fishes can be distinguished as (i) Marine, and (ii) Fresh water. (i) The marine fishes fall into two distinct groups, (a) Those whose osmotic concentration is the same as or slightly above sea water, e.g., hagfish, elasmobranchs, Latimeria etc. This group has no major [...]
In this article we will discuss about:- 1. External Features of Cuttle Fish 2. Locomotion in Cuttle Fish 3. Digestive System 4. Respiratory System 5. Circulatory System 6. Excretory System 7. Nervous System 8. Reproductive System 9. Fertilization and Development. Contents: External Features of Cuttle Fish Locomotion in Cuttle Fish Digestive System of Cuttle Fish Respiratory System of Cuttle Fish [...]
In this article we will discuss about the male and female reproductive systems of scoliodon. The excretory organ consists of a pair of elongated kidneys. The functional adult kidneys are opisthonephros type. The anterior portion of the kidney is non-functional and the posterior portion becomes greatly developed. The kidneys are composed of coiled glandular uriniferous tubules or nephrons. Each tubule [...]