Maine Seafood in East Windsor. Saybrook Fish House in Canton (Rte 44). Max’s Oyster Bar in West Hartford (high end seafood & prices). Carmen Anthony’s in Avon (Rte. 44) (Fancier Steaks & Seafood). Abbott’s on the coast, if you’re up for a drive.
If you have time, I would head for Route 1 on the coast. The towns of Old Sayrook, Madison, Clinton, Mystic, Old Lyme all have plenty of Roadfood quality seafood eateries.
If you’re restricted to the Hartford area – Max’s or Carmen Anthony’s.