The following points highlight the top five devices required for protection of fishes from their enemies. The devices are: 1. Scales 2. Electric Organs 3. Poison Glands in Fishes 4. Luminous Organs 5. Colouration. Device # 1. Scales: The body of all fishes (except the members of the family Siluridae and some bottom- dwellers) is covered by an exoskeleton in [...]
The following points highlight the seven main types of system existing in fishes. The types are: 1. Fin System 2. Digestive System 3. Respiratory System 4. Circulatory System 5. Nervous System 6. Excretory System 7. Reproductive System. Type # 1. Fin System: The fins constitute the major propulsive organs in fishes. These are either folds of skin or projections from [...]
The following points highlight the six main types of migration in fishes. The types are: 1. Latitudinal Migration 2. Vertical Migration 3. Spawning Migration 4. Feeding Migration 5. Overwintering Migration 6. Shoreward Migration. Type # 1. Latitudinal Migration: This is performed by fishes like barracudas (Sphyraena) and swordfish (Xiphius) of the warm tropical seas. They migrate to north in spring [...]