Butterfly fish

The Butterfly Fish (チョウチョウウオ, Chōchō̄-uo) is a small, yellow fish that appears in the sea during April to September. It is uncommon and can be found all day long. This fish will sell for 1,000 Bells, and must not be confused with the Sea Butterfly, which also sells for 1,000 Bells, but appears in winter. The Butterflyfish appears in, , and.

In
Upon donating the Butterfly Fish to the museum, Blathers will say;

It can be found in the back tank with the other sea fish.

In
Upon donation to the museum, the information board in front of the tank that houses the Butterfly fish says:

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

Real-world information
This butterfly fish is the oriental butterflyfish (Chaetodon auripes). There are many species of butterfly fish, some of which bear a resemblance to the barred knifejaw.