The opah surely gets top billing as the least-caught fish on this list. While not rare, these solitary and unique predators of the open ocean’s middepths are nowhere abundant: they patrol waters often too deep for anglers. Off California and Baja, speed jigging with heavy metal jigs accounts for some of those caught on rod and reel — always incidentally, usually when albacore, bluefin or yellowfin tuna are the targets. Opah are found worldwide in tropical to temperate waters and are occasionally caught in the Hawaiian Islands, as well as off California and Baja, and often found in markets; their orange flesh is superb eating. The IGFA all-tackle record was caught in 1998 off Port San Luis Obispo, California. It weighed 163 pounds, but fishbase.org cites the capture (presumably commercially) of an opah just shy of 600 pounds.