Take this for what it's worth. I tested circle, kahle, and J hooks on trotlines this past week, and these are my observations. Circle hooks had a higher percentage of fish on them. One line only had 4 circles on the line out of about 40 hooks. The line produced 3-5 a day, and everytime but once at least one of the circles had a fish, and once 2 of the 4 circles had a fish. Circle hooks are by far and away the most difficult to remove. Also we had more than one catfish get away from us or fall off the hook into a waiting net. I attribute this to the hook being in the very corner of the fishes mouth. If you use circles, then don't lift the line far out of the water with a fish on, and get a net under them quick. Kahles caught a very slightly higher percentage than J's, but like the circles were harder to remove. Though easier than the circle. We still caught plenty of cats on J hooks, and are the easiest to remove. It is possible we just put the circles in the place where the fish were. In retrospect I will continue to use all 3 hooks, but when making new lines will probably go with circles. My father will stick with J's because getting the fish off, and the occassional lost fish aren't worth perhaps catching a few nore fish to him. We caught 41 cats in all. Our freezer is full. It was a good fishing trip.