Brook trout

The brook trout is an inexpensive fish, able to be caught only in. It can be caught in the river pool. It appears all day and all night, all of the year.

Donating to the museum
Blathers will give a speech on the brook trout when the brook trout is donated to the Museum:

In Animal Crossing
"Even run-of-the-mill, common fish are valuable resources, you see. All part of the grand tapestry, wot! We will take excellent care of this fellow, oh yes. You can rest assured. Excellent care, indeed."

Further information
This fish lives in eastern North America, in lakes, rivers, and ponds at a high altitude. However, some of these fish stray out to sea, but, unlike the salmon, they will not stray far from the river mouth.