Shrimp (Caridea) - suborder Decapoda. The abdomen is muscular, longer than the thorax. Many have claws on two or three front pairs. The abdominal legs are used for swimming and carrying eggs (in females). About 2000 species. Predominantly marine, less often freshwater forms. Many Caridea are the object of fishing and aquaculture, serve as food for fish and marine mammals.
An infraorder of crustaceans of the decapod order (Decapoda). Widely distributed throughout the seas of the world, many species have developed fresh waters. The size of adults of different representatives varies from 2 to 30 cm. In the seas of the Russian Far East shrimp fauna has more than 100 species. Many representatives of this group are objects of industrial fishing. Although one of the existing types of aquaculture is called a "shrimp farm", the crayfish of the family Penaeidae grown on them according to modern concepts are not true shrimp, but another group of decadent legs - Dendrobranchiata.
As in all other representatives of the suborder Pleocyemata, from under the egg shells emerge stage with a full set of segments, and their number in the course of further development does not increase. Many species of shrimp is characterized by protandric hermaphroditism, that is, in the course of life they naturally change sex from male to female.