Blue King Crab
Commercially fished in Alaska and in Russia, blue king crab are known for their sweet flavor and exceptionally large claws.
In the United States, some seafood companies sell blue king crab as 'red king crab', because blue king crab shells turn bright orange-red, when cooked. Cooked blue king crab legs commonly have brown spots around the base of the spines, so that is one thing you can look for to distinguish blue king crab.
'Blues are typically harvested in fall, or winter fisheries - which is when their legs have the greatest in-fill of sweet, succulent meat.