Bring a pot of water to a boil. Add salt, the sliced lemon, and the remaining wine. Poach the sea bass, scallops, salmon, and tuna for 4 minutes; remove with a slotted spoon; add to the clams and mussels. Stir in the Grano, string beans, parlsey, lemon juice, remaining olive oil, salt, and pepper. Serve over the frisée on a platter.