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Fishes of Idaho

How are your identification skills? Do you know which are native and which were introduced? To see photos and descriptions, and learn more about Idaho fish, check out our Fishes of Idaho online database.

There are around 20,000 species of fish in the world. About 58% of these are marine (saltwater) fish, 41% are freshwater fish, and 1% are both. We have around 100 species in Idaho, and the list keeps growing as more non-native fish are released into Idaho waters. There are only 39 species of fish native to Idaho. The rest were introduced--some by accident, but most on purpose.

Pikes (Esocids)

Tiger muskie (Esox lucius x E. masquinongy)


Tiger muskies are not actually a species of fish, but a hybrid created by crossing a male northern pike with a female muskellunge. The cross-breeding makes tiger muskies sterile (unable to reproduce). For this reason, tiger muskies have been used throughout the country to meet demands for large, aggressive sport fish, without the risks of permanently introducing an uncontrollable predator. They are stocked in several lakes throughout Idaho, most notably Hauser Lake in Kootenai County, where the state record has been set several times since 1994 and currently stands at 34 pounds, 8 ounces.

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