Nemo is a fictional character and has no adaptations. If you are referring to Clownfish in general, they have developed a symbiotic relationship with the sea anemones they live with. The Clownfish attract larger fish that the anemones stun and eat, and the Clownfish get protection from bigger fish.
An orthodontist
In "Finding Nemo," the crab uses its ability to camouflage and blend in with its surroundings to evade the mine birds. By quickly hiding in the sand and mimicking its environment, the crab successfully avoids detection. This adaptation allows it to stay safe from predators while navigating the dangers of the ocean.
A Barracuda
Bubbles is a Yellow Tang fish.
Pacific Regal Blue Tang
It's not an adaptation. It's an original story.
clown fish
An orthodontist
Clownfish
a goldfish.
nemo
Shark
Anchor in the movie Finding Nemo is a hammer head shark.
It is a Dentist's office
a whale
A Damselfish
If you are asking whether or not Nemo's kind of fish exist, then yes they and they are called clownfish. If you are actually asking if there's a talking clownfish out there that's name is Nemo, then the answer is no.