Just like to point out, there is no scientific definition of fish. It doesn’t make sense from a evolutionary perspective (many types of fish are evolved from land animals and vice versa).
However if you categorize it as animals that with gills, you lose a bunch of animals typically considered fish like several species of amphibious fish, while including many animals not typically considered fish, like several frogs.
Then there is of course lungfish with both lungs and gills, and fish with other breathing organs entirely.
Many biologist therefore argue that even whales should be considered fish despite being mammals, i don’t remember the exact reasoning though, but i think it’s related to evolution and the clade(s) they belong to.
Sorry for pulling the “um ashtuly” card,
just a big autistic nerd.
Just like to point out, there is no scientific definition of fish. It doesn’t make sense from a evolutionary perspective (many types of fish are evolved from land animals and vice versa).
However if you categorize it as animals that with gills, you lose a bunch of animals typically considered fish like several species of amphibious fish, while including many animals not typically considered fish, like several frogs. Then there is of course lungfish with both lungs and gills, and fish with other breathing organs entirely.
Many biologist therefore argue that even whales should be considered fish despite being mammals, i don’t remember the exact reasoning though, but i think it’s related to evolution and the clade(s) they belong to.
Sorry for pulling the “um ashtuly” card, just a big autistic nerd.