Search this gallery: Log In User Name:   Password:   Remember me next time. Forgot your password? IMAGE GALLERY SWFSC » Fishes » Opah (3 objects, created 9/30/2010) Album: Opah Summary: Opah, also known as moonfish, are large, disc-shaped fishes that live their entire lives in the open ocean. The can reach six feet in length and 600 pounds, and are frequently caught as bycatch in longline tuna fisheries. Although not commonly caught opah are prized by deep water recreational anglers for their unique coloration and light flavor. Although Southwest Fisheries Science Center does not do any direct research on opah, they are occasionally encountered during our research cruises. When this occurs, their length and width are measured, and they are sometimes tagged to learn more about their movements. For more information visit the Large Pelagics Program of the Fisheries Resources Division. Date: Opah ... Opah ... Opah ...