Steelhead: Oncorhynchus mykiss
Sockeye Salmon: Oncorhynchus nerka
Chinook/King Salmon: Oncorhynchus tshawytscha
Coho/Silver Salmon: Oncorhynchus kisutch
Pink/humpy salmon: Oncorhynchus gorbuscha
The oncorhynchus is a member of the salmonidae family which includes all Pacific salmon and trout.
Good steelhead has firm flesh with bright silver skin. Downriver steelheads turn red. This happens after spawning and they float downriver while dying. There is much debate as to the tastiness of downrivers. Most locals prefer bright silver (aka brights) steelehead. Some will take downrivers for use as dungess crab bait. It can be either smoked or grill. Tastes great either way. Best way I have found thus far is to descale, remove pin bones (if filleted), and coat skin with evoo. Season lightly with salt and ground pepper. Steelhead, sockeye, Chinook, and coho are naturally good.
I am not a fan of humpies. When I fished humpy season I take my limit to use as dungess crab bait. Humpies are oily and don't taste very good. But the crab really like them. There were people that would hang out in parking lots to fillet people's catch in exchange for the heads and guts. They use them for crab bait. Dungess crab is very good. :)