| Area | Basin-wide/Regional |
| Topic | Tour: Fish Species of the Russian River, Non-Native Fish |
This photo shows an adult smallmouth bass, a non-native species introduced into the Russian River, after it has been measured and weighed during electrofishing above the Mirabel dam on the mainstem Russian River. These fish are well adapted to the altered flow regime and elevated temperatures of the mainstem Russian River and are potential predators on young salmon and steelhead. Image provided courtesy of the Sonoma County Water Agency.
Largemouth bass are also an introduced species in the Russian River. They do well in the reservoirs and so there is a seed source for the lower mainstem from Lake Mendocino and Lake Sonoma. This species is not as well adapted to riverine existance as is the smallmouth bass. Image provided courtesy of the Sonoma County Water Agency.
The striped bass is a native to the East Coast but has persisted along the entire West Coast after its introduction in the late 1800's. Although striped bass are naturally anadromous, they can also thrive in lakes and reservoirs. This fish may have washed downstream out of Lake Mendocino where there is a well established population. Image provided courtesy of the Sonoma County Water Agency.
The American shad is another introduced East Coast species that has spread and become established in many major Pacific northwest rivers. The species is anadromous and this fish was likely intercepted on its spawning run by electrofishing in above Mirabel dam on the mainstem Russian River. Image provided courtesy of the Sonoma County Water Agency.
Carp are a widespread exotic species in the United States. This specimen was captured using electrofishing above Mirabel dam on the mainstem Russian River. Photo provided courtesy of the Sonoma County Water Agency.
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