get a 2 liter bottle and cut about 1/4 of the top off the bottle. you will have to cut the pour spout out to the size of your fish. Invert the top piece into the bottom piece and tape the two pieces together. Make sure you strip[ any of the labels off the bottle. Bate the trap with whatever food the fish eats. He will go in but wont be able to find his way back out. This works like a charm. Sorry about the directions if its confusing there is a youtube video on this.