What is a fish?
a fish is a type of vertebrate. (1)
Fish are a type of aquatic animal. (1)
Fish are in the phylum Chordata. (1)
Fish are cold-blooded. (1)

What defines a fish?
has scales, fins, and gills (1)

What do fish contain?
has scales, fins, and gills (1)

What do fish do?
Fish can breathe air. (1)

How many fish are there?
There are over 33,600 estimated species of fish. (1)

What are types of fish?
freshwater fish
saltwater fish

big fish (eat only a few times per month) (2)
sharks
pike
albacore tuna
halibut

medium fish (eat a few times per week)
trout
tuna (can)

small fish (eat unlimited)
salmon
pollock
oyster

krill

Resources
1. https://leafyplace.com/animal-classes-types-groups/
2. https://en.wikipedia.org/wiki/Mercury_in_fish#/media/File:MercuryFoodChain.svg

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