? Squid is not a fish. Although we used to call it a fish, it also breathes with gills, but in fact it is not a fish. First of all, in terms of appearance, fish are characterized by scales and fins. Squid have smooth body surface and no fins. Secondly, in terms of internal structure, fish have vertebrae, while squid have bones, but the bones are relatively soft, which is different from fish. Therefore, squid is not a fish, but an animal belonging to the order Decapoda, subclass Dibranchia, class Cephalopoda, class Mollusca.
between squid and octopus? 1. Different body shapes: Octopus, also known as octopus, has a soft body, no bones, large compound eyes on its head, and eight retractable wrists, which look like a ball. The head of squid is flat, and there is a cartilage in the body. There are 10 tentacles in the front, the tail end is triangular, the overall shape is tubular, and the cross section is circular.
2. Living habits are different: squid generally swim fast and like light, while octopus crawl on the bottom of the sea with suckers and prefer dark environment.
