Octopus and squid are not a kind of fish. Octopus (Octopus): for the octopus family 26 genera 252 species of marine mollusks of the common name. Octopus is the largest family of cephalopods, which can be divided into the deep sea to take the stool polypods octopus subfamily (Bathypolypodinae), Ai Erduo octopus subfamily (Eledoninae), valley octopus subfamily (Graneledoninae) and octopus subfamily (Octopodinae). The octopus body is ovoid or oval, strongly muscled, with a narrow opening of the outer coat cavity, and the body surface is generally not porous. Carapace sucker 1 or 2 rows. Male left or right 3rd carpus stalked, ventral margin of carpus next to rent with spermatic groove, terminal with spoon-like lingual lobe; stalked carpus not self-breaking. Squid, also known as soft fish, gun squid, is the mollusc phylum cephalopods class sheath subclass ten carpal order tube squid order open-eyed suborder animals. Squid body conical, body color pale, with light brown spots, head large, anterior born with 10 tentacles, tail end of the fleshy fins are triangular, often in groups cruising in the ocean at a depth of about 20 meters.