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It's not common for this to happen but it does. I have seen it most often with brook trout and smallmouth bass, but most any fish will occasionally try to eat fish 1/2 their length or greater, sometimes as big or bigger than themselves. But usually, even the largest predators like pike, lake trout, and catfish prefer baitfish 1/4 their length or less. Choking mortality is common when they try to eat fish greater than 1/3 their body lengths.
I have seen a pike over 46" with a three pound rainbow in it's throat. The pike was dead along the shore and it looked as though both fish died at around the same time, though it's hard to say. Mostly it's smallmouth trying to eat each other, or brook trout. Those fish seem to be the most aggressive.
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