Cioppino (Fisherman's Stew)

Ingredients

• + 2 tablespoons extra-virgin olive oil, divided
• finely chopped shallots, from about 3 shallots
• garlic, minced
• white wine
• can crushed tomatoes
• bottles clam juice
• teaspoons sugar
• teaspoons salt, divided
• teaspoon crushed red pepper flakes
• teaspoon dried oregano
• sprigs fresh thyme, plus 1 teaspoon fresh chopped thyme
• pounds firm-fleshed fish fillets, such as halibut, cod, salmon, snapper, etc., c
• tablespoons unsalted butter
• pounds littleneck clams, scrubbed
• pounds extra large raw shrimp, peeled and deveined
• Fresh chopped Italian parsley, for garnish