No difference. Red sturgeon, also known as blue crab, is a species of crab. It is mainly produced in river estuaries, offshore, inland seas, and bays in Fujian, Zhejiang and other places. It has extremely high nutritional value and is good for children with nocturia, elderly people with frequent urination, and neurological problems. It is beneficial for frailty, physical weakness, anemia, rickets in children, illness and postpartum.