Buy the gear
Swing by a tackle shop for a pole and bait. Ask about any fishing restrictions for the area you’re going to.
Dispatch the fish
If you catch a fish, apply a quick, sharp blow to the top of its head with a hatchet handle or heavy stick to kill it instantly (the most humane way, according to the Washington Department of Fish and Wildlife).
Make a shallow slit down the length of the belly. Gut the fish, then rinse well.