Ive got good news if you like the Burbot (Ling, Ling cod, Freshwater cod, Black mariah).
I beleive that they are found over most of north America and are supprisingly easy to catch for yourself. I have one about 2 incher in my tank. They are peaceful fish but can get quite large and will eat smaller fish. They are quite slow growing and around here they seldom exceed 3 feet in length in the wild (I assume smaller in aquaria). However I have seen pictures of a couple monsters from the great lakes that were at least 6 feet long if not longer! Anyway in the wild they spend most of their time as juveniles hiding under rocks in shallow water (6" to 3') and as adults lay on the bottom in the deepest parts of the lake below the thermocline scavenging dead fish and venturing up into the shallows at night. Suprisingly my Ling is active all day in the tank at all levels despite plenty of suitable hiding spots available and seems to be doing well on shrimp pellets.
Anyway, if you would like your own Ling, try turning over rocks in the shallows being careful to keep your shadow behind you. look carefuly under each rock as they can be hard to see sometimes. The light seems to stun their eyes and they will freeze in position on the bottom. Slowly place your hands near the bottom on each side of the fish and move them slowly toward the fish being careful not to cast a shadow on it. keep moving closer and immediately cup your hands together when the fish spooks and runs into your hand. It may take a few tries to get the hang of it but once you get good you should be able to get nearly every one you find!
Have fun but make sure first that you are allowed to transport live wild fish in your area!