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Yep, no matter what answer you get here I would call NHF&G with that question.
I got a couple bigger nylon crab traps with larger openings, hoping to catch pike bait, I have caught 3 trout in the past week in a tiny stocked pond. The town puts 50-100 trout in every spring, figured they would be dead or caught, this ponds really a damned brook with a spill way, decent water flow all year I guess to keep the trout alive.
Assuming you're from NH?I'd look up (trapping) bait regs in the rule book or on the inter web.There are quantity and size limits of bait traps including hole size, to be legal.