Captain Marden's seafood market in Wellesley is a great place to pick up fresh seafood, including shellfish. This market has a giant selection, and everything is displayed out in the open so that you can look over the appearance of the item before you buy. It isn't the cheapest fish market, but the quality is definitely worth it. On the weekends, it does get pretty crowded, but there are lots of people working usually, so the line goes down quickly.
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