Species that are considered high risk have a well-documented history of invasiveness in at least one location globally, and a high or medium climate match to the contiguous United States.
Hucho hucho, the Huchen, is a large salmonid native to the Danube River drainage. The species is reared via aquaculture and caught both commercially and recreationally. This species was once found throughout much of the Danube River drainage, but populations have drastically declined over the past 100 years causing H. hucho to become endangered. The history of invasiveness is high. This species has been purposely introduced in both its native and non-native ranges in an attempt to preserve the species. Introductions of this species do not often become established and many areas rely on continuous restocking. However, a few introductions outside of the native range have resulted in self-sustaining established populations. There has been a documented negative impact associated with one of those populations, the decline of other large sport fish. The climate match with the contiguous United States is high. The highest areas of match for the contiguous United States occur in the Northeast, around the Great Lakes, and west of the Rocky Mountains in the Northwest. The certainty of assessment is medium. The overall risk assessment of Hucho hucho is high.
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High Risk
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