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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.

Minnows (Cyprinids)

Leopard dace (Rhinichthys falcatus)


The leopard dace is a western species found in the Columbia and Fraser River systems of OR, WN, and British Columbia. In Idaho, it occurs in the Snake River system below Shoshone Falls. The species inhabits slower and deeper water of streams compared to the longnose dace. It probably spawns in early summer and in a similar manner as that of the longnose dace. Aquatic and terrestrial insects make up most of their diet. Leopard dace grow to 3 - 4 inches in length. They probably are forage for other predaceous fishes, and thus, form a link in the food chain between insects and large fish.

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