San Diego Bay has halibut that you can readily catch with a fly rod. I think the size limit for keepers is 22 inches. Wading out in the bays and channels, throwing imitations of smelt streamers (with a sinking line) ,, is almost guaranteed to catch halibut. 30 pounders are quite commonly caught in this area, (gear fishing is far more productive). Halibut are very tasty. I don't think I ever let a legal one go. The way they swim (and fight) is quite unique, much different from a trout. Halibut always "play possum" after a long fight, but they always have one more intense run in them just as they are about to be netted. Once I learned that about them... the big ones did not get away.