7 Main Types of System in Fishes | Phylum Chordata

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 [...]