Idaho AFS Logo

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.

Sculpins (Cottids)

Wood River sculpin (Cottus leiopomus)


The Wood River sculpin is restricted to the upper Little Wood River and tributaries, and the Big Wood River and tributaries upstream from Magic Reservoir, Blaine Co. It occurs mainly in small to medium- sized streams with cool, clear waters and swift current. No studies have been conducted on the biology of this species, but probably it is similar to other sculpins. This species is an Idaho endemic. It is considered a species of special concern because of its restricted distribution. Any land management practices that degrade the aquatic habitat and water quality are threats to this species.

Click thumbnails to enlarge