Fish Anatomy (Definitions and Pictures)-Envirothon

Eyes

Used for sight, fish can detect colors and see short distances with these. They use them to escape predators and find food.

Nares

Similar to nostrils, except they are used for smelling only

Mouth

Used to consume food

Operculum

The bony flap that protects the gills from harm. It opens and closes to allow water to pass over the gills

Pectoral Fin

Allows for abrupt changes in side-to-side direction and speed. It also acts as a brake to decrease speed while swimming

Pelvic Fin

Stabilizes the fish while swimming and allows for up and down movement in the water

Vent

Removes waste and extra water. It is also the outlet for eggs or milt (sperm) during spawning

Anal Fin

Stabilizes the fish while swimming

Caudal Fin

This moves, propels or pushes the fish through the water

Adipose Fin

Not present in a lot of fish species. Its purpose is unknown. Trout, salmon and catfish have one. It is small, thick, fleshy fin located between the dorsal and caudal fins

Dorsal fin

Helps maintain balance while swimming

Scales

Protect the fish from injury