The difference between squid and octopus

The difference between squid and octopus: different body structure, different appearance shape and different living habits.

1, different body structures

Octopus's head and trunk are about 7-9.5 cm, with large compound eyes and 8 retractable wrists. Each wrist has two rows of fleshy suckers. Octopus wrist is about 12 cm long, octopus wrist is about 48.5 cm long and octopus wrist is about 32.5 cm long. Squid and cuttlefish belong to Decapoda, with ten brachiopods, conical body, pale body with light brown spots, big head, 10 touching foot in front and triangular fleshy fin at the end.

2, the appearance and shape are different

Octopus fish body is short oval, cystic 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 diamond-shaped end and fleshy fins on both sides of the carcass. On the other hand, it looks like a javelin head; The dried product is flat and blocky, slightly slender.

3. Different living habits

Octopus generally crawls on the bottom of the sea, and has a sucker on its wrist. It is a kind of Nocturnal Animals. It is very sensitive to light and likes to stay in the dark. If you live underwater, the adaptive water temperature should not be lower than 7℃, and the most suitable ratio of seawater is 1.0 1, and the environment with low salinity will die. The sediments in the sea area are preferably gravel layers. 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 lanterns on fishing boats, wait for them to rush at them in droves, 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, whitebait and Xiao Xiong fish, and is also the prey of fierce fish.

How to buy squid:

1, look at the skin: the skin of fresh squid is smooth and bright, and it is more elastic when we press it, so the squid is fresh. If it feels soft and inelastic after squeezing, it may be left for a long time, and the taste will be much worse than that of fresh squid. Purchase is not recommended.

2, look at the body shape: fresh and good quality squid are generally relatively complete, we can look at the complete squid, if the squid is somewhat incomplete, then don't buy this kind, generally it is poor quality squid, we don't choose this kind.

3. Look at the color: There are brown spots on the skin of squid, and they are widely distributed. This squid is a natural fresh squid and smells like the ocean. If the skin is white and the smell is pungent, then this squid must be bleached squid, which is generally processed with inferior squid. Don't buy squid with white skin.

The above contents refer to Baidu Encyclopedia-Squid Baidu Encyclopedia-Octopus.