The line is weighted alright, the times I've been with him he ties one end of the trotline to a tree limb the other end he takes the line along the edge of the river or to the center. There he sinks it after it's baited with half a concrete block. Attached to the bock is a rope with a crab trap float on it. The next morning he just finds the float, pulls up the block and checks the line. The only part of the line that is weighted is one end. I have seen him sink both ends of the line by attaching a block on each end with floats. I prefer bush hooks for catfishing, they're easier to work and more fun. Last January I caught some really nice channel cats on the Suwanee River. Here in Florida we don't have the giant catfish of the north, but enough 8 to 10 pounders to keep me happy.