How to cook Blue Swimmer crabs and recipes Steve Davis | Posted on November 20, 2020 After you have had all that fun and excitement of catching your blue swimmer crabs, it is time to cook them up. It is important to keep the crabs alive up to this point and they are best cooked on the same day. It is also handy if you can bring some fresh salt water up with you from the beach when you come in or if not, you will need to add salt to the water for cooking. You can put the crabs on ice or in the freezer for 20 minutes and this will send them dormant before cooking. There are many ways to cook crabs, but the most popular way is to boil them. When you are ready to cook, bring a large pot of salt water to a rapid boil and using tongs, place the crabs, one at a time in the salty water ensuring they are all submerged. Cover and bring the water back to the boil. Once the water has come back to the boil, reduce the heat and simmer for around 6 minutes for medium sized cr...