Place fillets in a shallow baking dish. Pour teriyaki sauce over fish. Cover and refrigerate 30 minutes or overnight.
Preheat oven to 450 degrees F.
In a shallow dish, combine sesame seeds with flour and pepper. Dip each fillet in the flour/sesame mixture.
Spray a non-stick baking pan with butter-flavored cooking spray and place the fillets on the pan in a single layer. Lightly spray the top of each fillet with cooking spray.
Bake 10–15 minutes or until golden brown. Fish is ready when it flakes when pricked with a fork.