Octopus and squid are not the same fish. Octopus: 252 species of marine mollusks belonging to 26 genera of Octopodidae. Octopus is the largest family of cephalopods, which can be divided into deep-sea octopus subfamily, long-finned octopus subfamily, long-finned octopus subfamily and octopus subfamily. Octopus is ovoid or ovoid, muscular, with narrow hair cavity opening and generally no water holes on its body surface. Wrist sucker 1 or 2 rows. Male left or right third wrist stem, with spermatic groove on the ventral edge of the outer wrist and spoon-shaped tongue at the end; The stem wrist can't be broken by itself. Squid, also known as soft fish and squid, is an eye-opening suborder of Cephalopoda of Mollusca. Squid body is conical, light brown, with light brown spots, big head, 10 touch foot in front and triangular fleshy fin at the end, and it often swims in groups in the ocean about 20 meters deep.