Many people, including myself, consider them by catch and never keep 'em. All of them I've caught were while fishing for halibut using live bait, smelt or sardines and/or with fresh dead or frozen anchovies or sardines. They put up a great fight and their tough skin will easily wear through mono line so 20 Lb. would be recommended. A dropper or reverse dropper rig with a 2/O hook on a 3 Ft. leader. Fish a spot outside of the breakers and move your set-up 10 Ft. or so every few minuets until it's directly under you, reel up and cast again fanning the area to cover as much area as possible. I've caught the most of them in the evening and at night but during the day also. Good Luck, let us know how you do.
Tight Lines Erik