Clown fish

The Clown Fish (クマノミ, Kumanomi), known as the Clownfish prior to, is an orange fish with white stripes. It can be found in the sea and has a tiny shadow size. The Clown Fish appears all day from April to September and sells for 650 Bells. There is a variant in called the Black Clown Fish that appears during a Fishing Tourney.

Donating to the museum
Blathers will say the following once the fish has been donated to the museum:

In
It can be found in the sea tank at the back of the aquarium, swimming in the area around the anemones on the left side of the exhibit.

In
It can be found in the small tank on the right hand side of the aquarium, sharing its tank with the Sea Butterfly and Surgeonfish.

Fishing Tourney
During a Fishing Tourney, when given a Clown Fish, Chip will say the following dialogue.

Real-world information
Clownfish are native to Indian and Pacific water and can be found in the Great Barrier Reef and the Red Sea. They are usually paired with Surgeonfish and Butterflyfish when sharing tropical and reef aquariums. The species of clownfish featured in the Animal Crossing series is the common clownfish (Amphiprion ocellaris) which is the most recognizable clownfish and the one most likely found in commercial aquariums. They are usually peaceful, but have been known to attack each other. As mentioned by Blathers in, it holds a strong bond with sea anemones, using them as a home and place of shelter. Although sea anemones are toxic, they fail to poison clownfishes, because they have a mucus lining on their skin that protects them. The clownfish and the sea anemone feed each other respectively, with the clownfish feeding on undigested matter left by the sea anemone and the sea anemone eats what the clownfish excretes. Wild clownfish are very rarely caught to be used in private and public aquariums; they are now tank-bred, which insures they are more immune to diseases and less stressed when introduced to aquariums.