How Big Do Rainbow Trout Get?

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This trout species can reach a maximum size of around 40 inches and 35-40lb.

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The average size of rainbow trout is somewhere between 15 and 25 inches and 1 and 5lb.

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Wild rainbow trout, which only reside in freshwater environments, will almost always be smaller than their anadromous (migrating up rivers from the saltwater) version, the steelhead.

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In Australia, rainbows have an average size of 10 to 20 inches and 1 to 4lb and a reported maximum size of 28 inches and 20lb. 

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In New Zealand, they have an average size of 15 to 22 inches and 3 to 7lb, and a maximum size of about 30 inches and 22lb.

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British rainbow trout can actually get quite big as well, with a maximum size of around 35 to 40 inches and a 30 to 35lb.

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Get even more interesting facts on the size of rainbows and the current world record via the link below!

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