CH...dude...pass on the chum aka dog aka keta salmon. Chum eggs make the best salmon caviar but it is wanting in the flavor and firmness of meat department. Here is a rundown on the salmonoids:
Chinook or King Salmon - Largest of the Pacific salmons with the most fat content. Best on the grill or for smoking.
Chum or Dog Salmon - Second largest of the Pacifics. Unless eaten fresh when silver bright, the meat quickly loses its firmness. Native Alaskans often use it to feed their dogs.
Coho or Silver Salmon - Third largest in the salmon family and with a medium to high fat content. Excellent for grilling, baking, sauteeing and smoking. My overall favorite.
Sockeye or Red Salmon - Brilliant red firm meat here on the 4th largest of the salmons. Many folks prefer this salmon as it is milder in flavor and not as fatty. Okay on the grill but better baked,sauteed, or canned.
Pink or Humpy Salmon - Smallest of the Pacifics and most often canned, as the quality of the meat is similiar to Chum.
Atlantic Salmon - While classified as a salmon, it is milder in flavor than the pacific variety and more akin to a large trout. It is excellent table fare no matter the method of cooking. This is the salmon most often farm raised. At a much lower price and very consistent in quality and size, it is a better value than wild salmon, if anything for the reason that wild caught salmon often are not processed in a consistent manner, i.e. gilled, cleaned, put on ice quickly. Additionally, farm raised Atlantic can be found all year round where as wild is seasonal.
Kokanee Salmon - This is a small landlocked sockeye salmon that lives in the waters of its birth and never ventures to salt water as the other salmon do. Although only as big as an average size trout, they are also excellent table fare. Cook it like you would any trout.
Often you may hear about Copper River Salmon from Alaska. This is a high fat content salmon in the King Salmon variety and also this river has a run of sockeye. The marketing gurus of the seafood world have really done thier homework and managed to convince those who love salmon that because these strains have more fat content that they are simply better overall. I have met those that swear they can taste a Copper River Salmon from say a Salmon caught in Bristol Bay Alaska. I have caught and eaten both in Alaska and will be the first to call "Bullshirt" on that one. Pass on Copper River at the market and save the double the price markup.
Buying whole salmon is cheaper by the pound vs. fish already filleted or steaked out, but bear in mind that the head, skin and carcass make up 40% of the whole fish and thus a waste of money unless of course you just like to clean fish. Your biggest bang for the buck is whole fillet Atlantic. Can't beat the quality and price.
I have heaps of recipes for salmon if you like. Cheers man. Herbie Nyukpuk, the Shishmareef Cannonball.