(From great-salmon-recipes.com)
There are two main ways to bake salmon.
* In foil or greaseproof paper (chefs call this 'en papillote'). Cut a piece of aluminum foil and/or greaseproof paper, brush with melted butter and place the salmon (or indeed any seafood) on the foil with some flavorings such as vegetables, flavored butter or wine and seal the foil to keep in the heat and moisture thus helping the fish to stay succulent. The salmon then cooks in it's own mini oven.
* In a casserole dish or roasting tray with vegetables and some liquid such as white wine to keep the fish moist. This method is particularly suitable for whole salmon and other types of whole fish such as Bass or Salmon Trout.
From great-salmon-recipes.com