Sprinkle fish with salt.
In a large skillet, cook onion in olive oil over medium heat for 8minutes. Stir in garlic, undrained tomatoes, oregano, and crushed red pepper. Bring to boiling, reduce heat. Simmer uncovered for 5minutes.
Add olives and capers to sauce. Top with fillets. Return sauce to boiling, reduce heat. Cook covered for 6-10 minutes. Remove fish. Simmer sauce uncovered 1-2 more minutes.
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