Rainbowfish

The Rainbowfish is a fish introduced in. It can be found in rivers from May to October (in the Northern Hemisphere) between 9 AM to 4 PM, and it sells for 800 Bells.

Donating to the Museum
As with all fish in, the Rainbowfish can be donated to the island's museum by talking to Blathers, the curator. He will say the following when given a Rainbowfish:

In New Horizons
"The rainbowfish is a tropical fish known for its metallic colors and beautiful fins. There are over 50 different species, each unique and pleasing color. I must say, it does make me wish for feathers of a more exciting hue than "underbaked brownie.""