Took nine folks out for Sanddabs. It was so calm that I set my styrofoam coffee cup on the cabin roof, forgot where I put it and found it when I fueled up. 20 sanddabs before 66 2/3's of the passengers were hurling violently and the remaining demanded to return to shore. 218 feet of water, 8 miles. They threw back the small ones. The intention was to have them cooked locally at a restaurant. We got back too early for the restaruant to open.