Those lines hanging from tree limbs over rivers was what grandfather called a jump line. He would catch frogs or perch and tie them where they where barley in the water and spalshing around. Catfish would come up and pow. when you go to check your lines you could see it bending into the water. I loved checking those and the trot Lines. Nothing like reaching under the water grabbing that line and feeling the tug of the Catfish on that long *** trot line. We also used Tangle nets and hoop nets.