Here is a picture of a wire mesh minnow trap like Bill talks about that I use to remove small GSF and BH from my old pond.
I put some fish food pellets in as bait, and the bellies of the fish are so full they look like they are going to explode.
It works best to check the trap about a half hour to an hour after baiting it. If left too long, some will find their way back out. That being said, I often forget about it and come back a day later and some fish will still be in there. I catch the BH mostly just before dark or at night. The GSF go in during the daylight hours mostly.
Some of my minnow traps have wire mesh too big for the fish food pellets to stay in. I wrap the pellets up in a piece of paper and put it in the trap. Bread works also for bait. The GSF will eat about anything. My fish are just used to being fed pellets, so they go right for the fish food.
