Sorry, I got off the subject. I'm interested in what level drops do. That's what got me to open this thread. But the thing that stuck in my mind, after reading the starting thread, was this commercial operation, showing a big stringer of Crappie, picking out individual fish with a very advanced system,using 8 rods at a time, saying he's having a tough time because of the cold. Seeing setups like that just seems too industrial.