Abstract
Megastraea undosa (Wood, 1828) and M. turbanica (Dall, 1910) constitute a notablefishery in Baja California, México and a much smaller fishery in southern California, USA. Theinsitu diet of M. undosa includes over 30 genera of marine algae. New data fromsouthern Californiaare presented and compared to research from México. Information regarding the habitat of earlyageclasses, change in shell shape with age, growth rates, longevity, and muscle weight vs. basal diameterare presented. California State Fish and Wildlife data for commercial landings of Megastraea for thepast 23 years indicate 75 % of the catch has been taken off San Diego, California. Among M. undosawith basal diameters of 90 mm or greater, approximately 15.5 % of the gross weight is edible muscle.
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