In the Great Lakes, sea lampreys are the most common predators of all Salmonidae species, including rainbow trout. Other predators in both native and introduced habitats include: larger Salmonidae, fish-eating birds like great blue herons (Ardea_herodias), mergansers (Mergus), and kingfishers (Ceryle), and mammals including mink (Mustela_vison and Mustela_lutreola), raccoons (Procyon_lotor), river otters (Lontra), grizzly bears (Ursus_arctos), American black bears (Ursus_americanus), humans, and larger marine mammals who feed on migrating steelhead. Rainbow trout tend to stick to the sides of streams and rivers where shading is prevalent, the water is less swift, and protection is greatest. Trout species are vigilant and capable of rapid swimming to escape predation.
- kingfishers (Ceryle)
- grizzly bears (Ursus_arctos)
- American black bears (Ursus_americanus)
- river otters (Lontra_canadensis)
- mink (Mustela_vison and Mustela_lutreola)
- raccoons (Procyon_lotor)
- sea lampreys (Petromyzon_marinus)
- mergansers (Mergus_merganser)
- great blue herons (Ardea_herodias)
- other trout species (Salmonidae)
- humans (Homo_sapien)
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