My catfish reproduce and start to show up at the feeders at about six inches. I have five feeders and the feeder closest to the dry creek has most of the small catfish which make me think the catfish are somehow spawning around that area of the pond. When your feeders go off and most of the fish at the feeders are catfish its time to start removing them. I am going to place the trap this weekend. I have been out of town a lot lately.