An aquarium of tropical fish at the entrance sets a marine mood in this seafood restaurant just off the Markt. Wood beam ceilings and plaid upholstery are cheerful but the real attraction is the seafood. The specialties here are mussels, eels, and lobsters prepared with white wine, cream or garlic sauces that enhance the flavor of the seafood without overwhelming it. Try a pail full of plain mussels, or go for something with a little more zest, like the moules Provencal (mussels in a light red sauce with mushrooms, peppers, and onions). And the homemade ice cream with caramel sauce is a good way to wind up.