Preheat the oven to 400F.
Spray the 9x13 inch baking dish with cooking spray.
Put the fish fillets in a baking fish in a single layer.
Sprinkle with salt to taste.
Pour the salsa on top of the fish, and spread it to coat the fish.
Put the salsa fish in the oven and bake for 20 minutes (or until the fish flakes easily with a fork).