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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.


Golden trout (Oncorhynchus mykiss aquabonita)


Golden trout are native to the Kern River drainage in California. They are very popular with trout anglers, mainly because of their beautiful coloration and their association with pristine alpine habitats. Golden trout have been stocked in mountain lakes throughout Idaho to provide a unique angling opportunity. Although they can achieve large sizes (Idaho record is 5 lbs 2 oz), they are not generally known to be large members of the trout family.

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