Step 1

Bring a large pot of water to a boil. Add the spaghetti and cook according to package directions; drain, reserving 1 cup of the pasta water. Toss the spaghetti with some oil and set aside.

Step 2

Add the oil, garlic, 3/4 teaspoon salt and crushed red pepper to a large skillet over medium-high heat. Once the oil begins to shimmer, add the tomatoes, reserved pasta water and oregano; bring to a high simmer and cook until the sauce thickens but is still loose, 12 to 15 minutes.

Step 3

Add the fish and olives and cook, stirring occasionally, until the fish is cooked through and flaky, 3 to 4 minutes. Add the spaghetti and parsley. Toss to combine and divide among four bowls.