Fish, mussels, crustaceans and co. are best accompanied with light, fresh white wines such as Welschriesling, Riesling and Veltliner, which definitely have a bit of saltiness may have.
Carpaccio versions of raw sea bass, scallops or cooked octopus are also very popular, with olive oil and lemon making a very delicate appetizer. A Sauvignon Blanc that is not too grassy is perfect with sea bass, and a fine Riesling also harmonizes perfectly. With pulpo and scallops you can go for a stronger white wine like a Pinot Blanc, perhaps from a large oak, an elegant one Chardonnay or a powerful Grüner Veltliner with spice and smoothness.