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I recently helped with a Pass Lake fish census, weighing and measuring Triploids alongside what the biologist called "wild" rainbows. I can provide some identification help from what I observed. Like Preston said the first thing you notice is the bright silvery coloration of the fish. They are big shouldered, tapering towards the tail. But the tail of these fish is rounded and irregular, chewed up if you will. The "wild" rainbows have nice forked tails coming to a nice point. Hope this helps.
 
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