Octopus is another name for octopus. They are the same animal. Octopus is a temperate mollusk, which is also called Shiju, dead cattle, etc. Its body is short oval, without fins, and the boundary between head and body is not obvious. The head and trunk are about 7-9 cm long, with large compound eyes and 8 retractable wrists on the head. Octopus has eight wrist feet.

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. It can feed on macrozooplankton and grow, and is widely distributed in tropical and temperate waters of the world's oceans. Octopus is carnivorous, feeding on cladocera and crustaceans, and some species eat plankton.

Breeding mode of octopus

The breeding time of octopus in the ocean is generally concentrated in spring and autumn, and the seawater temperature in spring and autumn is about 16℃. Octopus likes to lay eggs in snail shells, so it can be sunk to the bottom of the sea with a rope through the red snail shell and caught on time. In autumn and winter, they often burrow in the sediment in deep waters. Octopus is dioecious. The male body has a specialized wrist, called the stem wrist or the cross wrist, which is used to put the sperm bag directly into the female body's coat cavity.

During the breeding season, female octopus lays eggs, about 0.3 cm long, which are produced under rocks or holes. During incubation, the female guards the eggs, cleans them with suction cups and stirs them with water. Female octopus needs larvae to hatch after 4-8 weeks after laying eggs at one time. Young octopus looks like an adult and is small. After hatching, it needs to drift with plankton for several weeks, and then sink to the bottom of the water for concealment.