Fisheries that catch or raise crabs are known as crab fisheries. 20% of all crustaceans captured and farmed globally are true crabs, with 1.4 million tonnes consumed each year. One-fourth of that amount is made up by the horse crab, Portunus trituberculatus. The edible or brown crabs (Cancer pagurus), blue crabs (Callinectes sapidus), flower crabs (Portunus pelagicus), snow crabs (Chionoecetes), mud crabs (Scylla serrata), edible or brown crabs (Metacarcinus magister), and blue crabs (Callinectes sapidus) are additional significant species. Each of these crabs contributes more than 20,000 tonnes annually.
The following species of crabs and sea spiders are included in the definition of “crabs and sea-spiders”: “Atlantic rock crab, black stone crab, blue crab, blue swimming crab, dana swimcrab, dungeness crab, edible crab, cazami crab, geryons nei, green crab, hair crab, harbour spidercrab, Indo-Pacific swamp crab, jonah crab, marine crabs nei, Mediterranean shore crab, Pacific rock