Loach

The Loach is a fish found in the river, all day durng the months of March through to May. It's shadow size is between small/medium, roughly the same size as the Rainbow Trout and Carp. When caught, the 'Bugs and Fish' window says "These use their whiskers to taste the environment and search for food."

Donating to the Museum
Upon the donating to the museum, you can find the Loach in the middle-left tank.

Further Information
It is unclear what type of loach appears in Animal Crossing, due to the vast varieties of loaches that exist. It is however, a member of the Cobitidae family of loaches, called the True Loaches, which live in fast flowing waters. It could be a horse-face loach which grows to roughly 8 inches. All true loaches are "bottom feeders," meaning they swim at the bottom of rivers and tanks eating the algae at the bottom. They also eat small crustaceans and insects, but only during the day.