螃蟹是甲壳动物蟹类的俗称。它的种类非常多,我国約有二、三百种,食用螃蟹也相当多,市場上常見的梭子蟹、青蟹、日本蟳和河蟹(中华絨螯蟹)等都是食用蟹。螃蟹多栖息在近海与浅海的水域里,淡水和半咸水中也有分布。根据栖息的水域不同可分为海螃蟹和河螃蟹两大类。 Crabs are commonly known as crustacean crabs. Its species is very large, there are about two or three hundred species in China, and there are also a lot of edible crabs. The common crabs, blue crabs, Japanese quails and river crabs (Chinese mitten crabs) are all edible crabs. Crabs inhabit more waters in the open sea and shallow seas, and are also distributed in fresh and brackish waters. According to the inhabited waters, they can be divided into two categories: sea crabs and river crabs.