I have used corn for bait before, not sure if they can digest it or not, have heard alot about them not being able to but never read or seen any conclusive evidence proving this. Im not sure if fish can puke, i know they can burp to release air out of their swim blatter so i would imagine they can puke, and if the stainless hook is barbless i would imagine it would eventually work itself free of the fish's mouth but it wouldnt breakdown.
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AKA MAVERICK
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