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 exoskeleton and endoskeleton structure of scoliodon. The exoskeleton includes predominantly the scales which are present all over the body. Endoskeleton comprises of the axial and appendicular skeleton. Exoskeleton: The entire surface of the scoliodon body is covered by oblique rows of placoid scales or odontoids (Fig. 1.29). Atypical placoid scale has a [...]