Sea cucumber is very rich in nutrition, and it has been shaped into "ginseng in the sea" by people. The growth ability of sea cucumber is very strong, even if the internal organs fail, it can grow new internal dryness after a few weeks. When the sea cucumber meets the enemy, its body will shrink violently and throw the dry organs in the anus to the enemy. Sea cucumber can be regenerated by cutting off a part of its body. Even if the enemy eats more than half of it, it can grow a brand-new body in a few months. Because sea cucumber crawls very slowly, it can only advance 4 meters per hour, so it relies on camouflage, squeezing out internal organs to lure enemies and powerful regeneration skills to survive.

living environment

Sea cucumbers like to live in the bottom area of rocks or sediments with dense seaweed, slow water flow, no fresh water inflow and high transparency. Some sea cucumbers are exposed outside the algae, while others are hidden in the mud. It adapts to the water temperature of 0-30 degrees, the salt content is 26%-32%, the breeding period is in July, and the breeding ability is strong.

Take food

The digestive tract of sea cucumber was sampled and investigated. Sea cucumbers feed on sediments, seabed sediments, phytoplankton, seaweed fragments, shrimps and crabs molting, sawdust and so on. Larger sea cucumbers also eat larger bait. Sea cucumbers use tentacles to clean the sediments on the seabed surface, and use tentacles to clean or stir the particles on the stone surface. Their intake is non-selective, and indigestible food is excreted. Except for a small amount of sediment, most of them are algae and sundries.

sports

The sea cucumber crawls forward by stretching muscles, and the muscle movement from the back end to the front end contracts and fluctuates, which is similar to a big caterpillar. It moves very slowly and crawls 2 meters in about half an hour, so the sea cucumber often stays in one place and rarely moves.

breed

It's difficult to tell the sex of sea cucumber. During the breeding season, the female gonads are apricot yellow or orange red, and the male gonads are yellow-white or milky white. The spawning period is from May to mid-July along the coast of Shandong Peninsula, and from mid-July to mid-August in Dalian, mostly from evening to late at night.

estivate

Why do sea cucumbers sleep in summer? Sea cucumbers feed on small creatures at the bottom of the sea, but when the water temperature is warm, they will surface. When summer comes, a large number of microorganisms float to the water surface, and sea cucumbers are sensitive to water temperature and will migrate to the deeper seabed. There is not enough food at the bottom of the deep sea, so sea cucumbers can't hunt. After long-term evolution, sea cucumbers adapt to this environment by entering summer sleep state.

When the water temperature rises above 20 degrees, the sea cucumber enters a state of summer sleep. They move into deep water and hide at the bottom of the reef. Their bellies turned up, their bodies shrank, their digestive tracts became thinner and thinner, and they stopped eating. Until autumn comes, the water temperature drops, and people climb out to exercise and eat. The water temperature in different sea areas is different, and the summer sleep time of sea cucumber is also different.

Sewage discharge

Sea cucumber existed hundreds of millions of years ago and is a wonderful animal. When the sea cucumber is attacked by the enemy, the sea cucumber will quickly spit out all kinds of internal organs to lure the other side to eat, and the sea cucumber will take the opportunity to escape, which is to drain the dirty.

The regeneration ability of sea cucumber is very strong. Sea cucumber without viscera will not die, and a new organ can grow in about 1 month.