Permanently Closed - The Nauti Mermaid Crab House & Piano Bar is located in Philadelphia, United States on 110 Chestnut St. Permanently Closed - The Nauti Mermaid Crab House & Piano Bar is rated 4 out of 5 in the category seafood in United States. This restaurant is permanently closed. The Nauti Mermaid is an authentic Southern Maryland crab-centric restaurant inspired by our childhood memories of the great crab houses of Maryland and the eastern shore. With an influence that’s anchored in The Chesapeake Bay Region diners can enjoy a menu that includes Southern Maryland classics such as Steamed Blue Crabs, Colossal Crab Cakes, Grilled Rockfish, and more. With a menu that is prepared daily by our Chef you can close your eyes and be transported back to the Chesapeake region. Come for our Maryland Steamed Blue Crabs but be sure to try our raw bar, crab cakes and steamed clams.