What do normal fish eat?

It's impossible to give a single answer to what "normal fish" eat because there are so many different types of fish! Their diet depends on a lot of factors, including:

* Species: Some fish are carnivores (meat eaters), while others are herbivores (plant eaters), and many are omnivores (eating both).

* Size: Smaller fish tend to eat smaller prey like plankton, while larger fish can eat other fish, crustaceans, or even birds.

* Habitat: Fish living in reefs have different food sources than those living in deep ocean trenches.

Here are some examples of what different types of fish eat:

Carnivorous Fish:

* Sharks: Mostly eat fish, seals, and other marine animals.

* Tuna: Eat smaller fish, squid, and crustaceans.

* Barracuda: Ambush predators that eat fish, squid, and eels.

Herbivorous Fish:

* Parrotfish: Scrape algae off coral reefs.

* Grass Carp: Eat aquatic plants like algae and water hyacinths.

* Manatee: Mostly eat seagrass.

Omnivorous Fish:

* Goldfish: Eat a variety of foods including flakes, pellets, worms, and algae.

* Koi: Eat insects, plants, and algae.

* Catfish: Eat insects, worms, crustaceans, and algae.

To learn more about what a specific type of fish eats, you can research the species online or consult a fish guide.