In English, Opakapaka is Hawaiian pink snapper and one of those fishes that are in the "good" category to eat, both in terms of how it is caught and its nutritional value (see Hawaii Seafood)
In the Bay Area, you can find opaka at Whole Foods, but it tends to be hit or miss. I used equal amounts of cilantro and green onions, a little less fresh ginger, a little shoyu and oil for the fish marinade. Sauce from coconut milk, onions, heavy cream. Salt and pepper to taste. Oh yeah and a large cod fillet.
Click here for more details and what I'll do next time.