1, body structure is different: the head and trunk of octopus are about 7-9.5 cm, with large compound eyes and 8 retractable wrists. Each wrist has two rows of fleshy suckers. The wrist length of octopus is about 12 cm, that of octopus is about 48.5 cm, and that of octopus is about 32.5 cm. Squid and cuttlefish belong to Decapoda, with ten brachiopods, conical body, pale body color, light brown spots, big head, touching feet 10 in front, and the fleshy fins at the tail end are triangular. In addition, the squid tail has a "bone" similar to a plastic piece; As for Octopus, the inner shell has been completely degraded, so they have extremely excellent body-shrinking skills and can drill in and out from very small holes.
2. The appearance and shape are different: Octopus is short oval, saccate and flipless; The boundary between head and body is not obvious. In addition, octopus has highly developed cells containing pigments, which can change its body color very quickly. Squid is generally slender, with a long diamond-shaped end, and fleshy fins on both sides of the carcass. When viewed upside down, it looks like a "javelin head"; The dried product is flat and blocky, slightly slender.
3, different living habits: Octopus generally crawls along the bottom with a sucker in the wrist. It is a nocturnal animal that is very sensitive to light and likes to stay in the dark environment. Living underwater, the water temperature should not be lower than 7℃, and the specific gravity of seawater 1.02 1 is the most suitable, and the environment with low salinity will die. The sediment in the sea area is preferably gravel zone. They feed on cladocera and crustaceans (shrimp, crab, etc.), and some species feed on plankton. Squid likes light, so fishermen use their habits to hang fish-collecting lamps on fishing boats, waiting for them to flock to them, and then catch them all. It often moves in the middle and upper layers of shallow water, and its vertical movement range can reach more than 100 meters. It feeds on krill, sardines, silverfish and small male fish, and it is also the prey of fierce fish. Eggs mature in batches and are produced in batches. Eggs are wrapped in colloidal egg sheaths, and each egg sheath contains several to hundreds of eggs depending on the species. The amount of eggs laid by different species also varies greatly, from several hundred to tens of thousands.
What's the difference between octopus and squid? That's all.