Here's why:

* Many fins: Fish are known for having multiple fins that help them swim, maneuver, and balance.

* Feeding on insects and plants: Many fish species are omnivores, meaning they eat both insects and plants. Some fish are even herbivores, primarily eating plants.

Examples of fish that fit this description:

* Goldfish: These popular aquarium fish are omnivores, feeding on both insects and plants.

* Carp: Carp are omnivores, known for eating insects, plants, and even small animals.

* Guppies: These colorful fish are omnivores, enjoying a diet of insects, plants, and algae.

Let me know if you'd like to know more about specific fish species or their diets!