PM Update: Scattered showers and thunderstorms through the early evening. Much cooler on Monday. You may have to dodge some raindrops through about 8 tonight. A cold front moves through tomorrow morning and ushers in much more seasonable weather.
Only cook live crabs, because they deteriorate very quickly after they have expired. You can simply throw the crabs in a pot of boiling water to cook them. Depending on the size of the crabs, it will take between 6 and 10 minutes for them to cook thoroughly. If the crab is alive when you start, the amount of cooking time has very little to do with safety  it s more a question of whether the meat is underdone, overdone, or cooked just right.
How do I cook live (in-shell) oysters, clams, and mussels? When boiling or steaming live clams, oysters, and mussels, use small pots and do not overload them because the shellfish in the middle may not get fully cooked. The Food & Drug Administration recommends: Boil shellfish for 3 to 5 minutes after shells open, or.