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How large a fish can an adult trout swallow?
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Rainbow trout (Oncorhynchus mykiss).
An adult trout is capable of capturing and consuming a fish that is approximately one-quarter of its own body length without significant difficulty.1
Trout are opportunistic predators whose diet includes insects, crustaceans, fish eggs, and small fish. When introduced into environments with abundant prey and a lack of other large predators, trout can grow rapidly and feed avidly on available fish species.23