1, the difference in appearance: sea red crabs have purple shells and are larger; crabs have a variety of shell colors, such as green, orange and so on.

2, nutritional value difference: sea red crab's meat is delicious, tender and flavorful, containing rich nutrients, including high-quality proteins, fats, carbohydrates, inorganic salts, and rich in vitamins. Crabs are mainly rich in protein and trace elements, lower nutritional value than sea rainbow crabs.