Here are the key parts of a fish:
1. Head - Contains the eyes, mouth, gills and brain.
2. Backbone (Spine) - Runs from the head to the tail. Many fish have fins attached along the spine.
3. Fins - Include dorsal fin, tail fin, pelvic fins and pectoral fins. Used for movement and steering.
4. Scales - Protective outer layer covering the skin. Some fish are scaleless.
5. Lateral line - Runs from head to tail along each side of the body. Detects vibrations in water.
6. Gills - Thin tissue behind the gills used for respiration. Water