brown trout

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A European freshwater game fish (Salmo trutta) that is brownish or greenish with red and black spots on the sides. It is naturalized in North America.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A species of freshwater trout, Salmo trutta, that is native to Europe and Asia.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun speckled trout of European rivers; introduced in North America