Bluefish with a Mustard Crust

OK, so no picture of a bluefish plate, but this guy seems proud to have caught one...

4 x bluefish - (8 oz ea)
(or mackerel or salmon fillets)
Salt to taste
Freshly-ground black pepper to taste
1/3 cup Dijon mustard
1 cup Atkins Bread Crumbs
1 tsp dried marjoram
4 tbl melted butter

Method :
Heat oven to 400 degrees. Grease a 9- by 13-inch baking dish with butter; set aside. Sprinkle fish with salt and pepper to taste. Spread mustard over both sides of fish fillets.
Combine bread crumbs and marjoram in a shallow plate. Press fish into seasoned bread crumbs. Arrange fish in a single layer in prepared dish. Drizzle with melted butter; bake 10 to 15 minutes (ours took at least 20, but its worth checking early), until fish is cooked through and bread crumbs are crispy and browned.