A trotline is a heavy fishing line with baitedhooks attached at intervals by means of branch lines called snoods. A snood is a short length of line which is attached to the main line using a clip or swivel, with the hook at the other end. A trotline can be set so it covers the width of a channel, river, or stream with baited hooks and can be left unattended. There are many ways to set a trotline, with most methods involving weights to hold the cord below the surface of the water. They are used for catching crabs or fish (particularly catfish). Trotlines should be used with caution as they are illegal in many states.