Combine first 8 ingredients in a small bowl. Stir to blend and set aside.
Sprinkle both sides of fillets with blackened seasoning.
Place a large nonstick skillet over medium- high heat until hot. Coat pan with cooking spray; add fillets, and cook 3 to 4 minutes on each side or until fish flakes easily when tested with a fork.
Remove from heat; place 1 fillet on each of 4 dinner plates. Spoon salsa evenly over fillets. Serve with lemon wedges.