Left to right. Photo#1: Two adult specimens of the sessile bivalve mollusk commonly known as sea pen shell (Atrina tuberculosa) and harvested by small-scale fishers of the three communities under study. Photo #2: Shows two abductor muscles pertaining to the two individuals of photo#1. Sea pen shells are harvested for their abductor muscle, which reaches high prices in the Mexican national seafood market. Fishers are paid up to $20 usd per kilogram at the beach –therefore there is great demand for them. Only shrimp and abalone reach such high prices. Their U.S. analogue are bay scallops. Photo #3: Typical small-scale fishing boat used in the Gulf of California, Mexico. Benthic mollusks are harvested by diving (photo #4), note the air compressor in the middle of the boat in photo 3 that provides air to the diver in photo # 4. Diver in Photo # 4 is walking on the bottom (using plastic boots) harvesting sea pen shells in a shallow fishing area.