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Western and Central Europe
Rudd resemble native golden shiners but can be distinguished by the presence of scales that completely cover the belly (shiners lack a fully scaled belly).
These fish quickly outgrow predation making them of little use to predatory fish.
They have been known to hybridize with golden shiners which are a native prey fish of predators such as walleye or pike. Hybridization may have detrimental effects to the genetics of native shiner populations.
Rudd are very difficult to distinguish from native shiners. They are often misidentified and sold as bait.