Terminology
| Term | Explanation |
|---|---|
| fish |
A type of water-dwelling vertebrate. Fish have adapted to life in water with specialized structures such as fins and gills. |
| zooplankton | Microscopically small aquatic organisms, such as water fleas. Zooplankton is the primary source of food of many small fishes. |
| predator fish | A fish that eats other fish. For example, a pike. |