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.
Bream (Abramis brama) is a large sized cyprinid fish native to much of Europe. It has a long history of use by humans, dating back to its use as a food source in the middle ages. The history of invasiveness is high. It has been introduced to new water bodies throughout most of Europe and much of western Asia. Introductions have been intentional for creating fisheries and unintentional as a possible bait dump or contamination. Established populations have had negative impacts including changes to the abiotic conditions of a lake, reductions in native plants and fish, and the co-introduction of a non-native parasite. The climate match to the contiguous United States is high. There are areas of high match stretching from the central Great Lakes basin to southern California. The certainty of assessment is medium, there is a preponderance of evidence. The overall risk assessment category is high.
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High Risk
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