The life span of octopus is about three or four years, but five years at most. ? Octopuses vary greatly in size. The smallest octopus is an arboreal octopus, about 5 cm long, while the largest species can be as long as 5.4 meters, and the wrist is almost 9 meters. Typical octopus body is saccular; The boundary between head and body is not obvious, with large compound eyes and 8 retractable wrists.

Octopus is a gentle mollusk. It lives underwater, and the water temperature cannot be lower than 7℃. The optimum proportion of seawater is 1.02 1, which will cause death in low salinity environment. Gravel zone is the best sediment in the sea area, and the water temperature is above 12℃, which can spawn every year. After hatching, the larvae are about 3 mm long and can grow up by feeding on plankton of large animals. After 45 days, when the total length is 10- 13 mm, they will settle on the seabed for benthic life.

Extended data:

Octopus is carnivorous, feeding on cladocera and crustaceans (shrimp, crab, etc.). ), and some species eat plankton. This is not a question of whether it likes it or not, because the stable structural myoglobin is a necessary condition for octopus to survive in the deep sea. It competes with lobster for astaxanthin resources. Astaxanthin is the strongest antioxidant and a necessary condition to ensure the structural stability of myoglobin from oxidation.

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 65438 06℃. Octopus likes to lay eggs in snail shells, so it can sink to the bottom of the sea with a rope through the red snail shells and be caught on time. In autumn and winter, they often make holes in deep-water sediments. Octopus is hermaphrodite. The male body has a special wrist, called stem wrist or crossed wrist, which is used to put the sperm bag directly into the coat cavity of the female body.

Every breeding season, female octopus lays eggs, about 0.3 cm long, with a total number of more than 654.38+ 10,000, which are produced under rocks or in caves. During the incubation process, the female guards the eggs, cleans them with suction cups and stirs them with water. Female octopus needs larvae to hatch 4-8 weeks after spawning once. The young octopus looks like an adult and is very small. After hatching, it needs to drift with plankton for several weeks, and then sink to the bottom of the water for concealment.