Fishermen with traps, also known as eelers, are fishermen who use traps to catch eels. They typically set the traps in shallow waters and wait for the eels to enter them. The traps are usually made of wood or metal and have a funnel-like entrance that allows the eels to enter but prevents them from escaping. Eelers often use bait to attract the eels to the traps. This type of fishing is an ancient practice that has been used for centuries.