Preheat oven to 450°.
Combine first 5 ingredients (lime juice through jalapeño) in a small bowl; stir well with a whisk.
Place fillets in an 11 x 7-inch baking dish coated with cooking spray. Spoon lime mixture over fillets. Bake for 15 minutes or until fish flakes easily when tested with a fork. Sprinkle with salt.