The principle of trotline fishing is the same as with survival trapping: Think big, catch small (or more accurately, think many and catch a few). Use whatever bait you can dig up--crickets, worms, or insect larvae. You might want to carry flavor-infused salmon eggs or soft plastics in your kit. When you do catch a fish, bait other hooks with the entrails, eyeballs, and belly flesh. Check trotlines every few hours and always allow them to fish for you overnight, when catfish and other large predators become active and invade shallow waters. With some luck, you'll have a fish fry for breakfast.