Place fillets in a 13- x 9- x 2-inch baking dish. Pour Citrus Marinade over fish. Cover and marinate in refrigerator 30 minutes.
Remove fillets from marinade, discarding marinade. Coat fillets with cooking spray. Place fillets on rack coated with cooking spray; place rack in broiler pan. Broil 5 1/2 inches from heat (with electric oven door partially opened) 10 minutes or until fish flakes easily when tested with a fork.
Coat a large nonstick skillet with cooking spray; add vegetable oil. Place over medium-high heat until hot. Add garlic, and saute 30 seconds. Add corn and red pepper; increase heat to high. Cook, stirring frequently, until corn is slightly tender and charred. Stir in green onions, salt, and pepper. Divide vegetable mixture among 4 individual dinner plates. Top each with a fillet.