Seafood Capellini with Saffron

6 tablespoons extra-virgin olive oil
1 pound shelled and deveined jumbo shrimp (8 shrimp)
1 pound monkfish or other firm white fish such as halibut, trimmed and cut into 8 pieces
Kosher salt and freshly ground pepper
One 14-ounce can diced tomatoes, drained
4 garlic cloves, minced
2 tablespoons minced flat-leaf parsley
1 serrano chile with seeds, minced
1 teaspoon hot paprika
2 cups chicken stock or low-sodium broth
One 8-ounce bottle clam juice (1 cup)
Pinch of saffron threads
6 ounces capellini pasta, broken into 3-inch lengths
Lemon wedges, for serving

In a large skillet, heat 3 tablespoons of the olive oil over moderately high heat. Season the shrimp and monkfish with salt and pepper and add to the skillet. Cook for 6 minutes, turning once, until barely opaque throughout. Transfer to a plate.
In the same skillet, heat the remaining 3 tablespoons of olive oil over moderate heat. Add the tomatoes and cook for 3 minutes. Stir in the garlic, 1 tablespoon of the parsley, the serrano chile and the paprika. Add the chicken stock, clam juice and saffron, season with salt and bring to a boil. Add the capellini and cook, stirring occasionally, until the pasta is al dente and has absorbed most of the sauce, about 5 minutes. Return the shrimp and monkfish to the skillet along with any accumulated juices and toss well. Transfer the pasta to bowls and garnish with the remaining 1 tablespoon of parsley. Serve with lemon wedges.