Pour olive oil into an 11- to 12-inch frying pan over medium-high heat. Break pasta into 3- to 4-inch lengths and drop into oil; stir often until golden, 6 to 8 minutes. Add onion, garlic, and turmeric; stir until onion is limp, 3 to 4 minutes.
Stir in broth and tomatoes, including juice; cover and bring to a boil over high heat. Spread mixture level. Evenly distribute artichoke hearts and clams, if using, over pasta. Cover, reduce heat to medium, and cook for 5 minutes. Evenly distribute shrimp, fish, and peas over pasta. Cover and cook until clams have opened and fish is barely opaque in center of thickest part (cut to test), 5 to 8 minutes longer.
Uncover and cook until pasta has absorbed most of the liquid and is beginning to brown on the bottom, 2 to 4 minutes. Add salt to taste. Garnish with lemon wedges to squeeze over seafood. Serve from pan.