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what i use for traps is i take a milk jug cut the top part off reverse it and glue it together. then i put a rock on top of it and one in the mouth of it so they can crawl threw the hole i use bacon and cheese for bait cheap and never had a problem with catching them then just cut a hole in the top to get them out and then just put a rock on the top to close the hole but usally they canr swim that far up i have had 30 in one trap before i stoped fishing and have not caught them for a few years use to have a blast checking the traps hope this helps