Best way to keep blue crab alive in a vessel?

To keep blue crabs alive in a vessel, ensure they are kept in a well-aerated container with seawater or brackish water at a temperature between 50°F and 60°F. Provide plenty of space to prevent overcrowding and add a layer of wet newspaper or seaweed to maintain humidity. Avoid letting the crabs touch fresh water, as it can be harmful to them. Regularly check and refresh the water to keep it clean and oxygenated.