As the saying goes, food is the most important thing for the people. This is also true in the underwater world. Eating is a skill that every living thing must possess. But can you believe it if some sea creatures are very strange when eating? They actually vomit out their stomachs when eating?

Undersea Garden

For us humans, it is impossible to vomit out our stomachs. Even if we can do it, it is still very disgusting. Things, can you accept throwing up in your own stomach?

Starfish

Starfish belong to the phylum Echinodermata and the class Starfish. There are many types. Most of them have bright and beautiful colors, which attract people and make people take the initiative to contact them.

Starfish

Starfish live on the seabed, and they are distributed from the coast to the deep sea. Generally speaking, there are more species in tropical and temperate seas than in cold seas; sea areas with sandy bottoms, rock bottoms and coral reefs have more species than mud bottoms. They are very sensitive to seawater salinity, and are rarely or completely absent near rivers entering the sea and in sea areas with low salinity.

Starfish usually live in groups. In the oceans of tropical coral reef areas, large colonies of starfish can often be seen, and large areas of the seabed are covered by them. As food and breeding seasons change, starfish also migrate, often crawling in groups from one place to another.

An explosion of thorn starfish that feed on corals will soon destroy the coral ecosystem

Regeneration and reproduction of starfish

Most starfish are dioecious. , only a few are hermaphroditic. Starfish not only eat an amazing amount of food, but their reproductive capabilities are also amazing! Take the spiny starfish as an example. The spiny starfish reproduces through in vitro fertilization. It lays eggs in summer and can lay eggs multiple times. It can lay nearly ten million eggs in one breeding season. It also releases chemicals to induce nearby individuals to lay eggs at the same time. .

Since the 1960s, large-scale outbreaks of the spiny starfish have occurred in major sea areas around the world, leading to degradation of coral reef ecosystems, reduction of marine biodiversity, reduction of marine fishery resources, and coastal erosion. series of ecological issues.

Haixing also has a unique skill: the ability to separate himself into two parts. If you tear a starfish into several pieces and throw them into the sea, each fragment will grow back the lost part, thus growing into several complete new starfish.

For example, a sand starfish can grow a complete new starfish by retaining a centimeter-long arm, while some starfish are more capable and can grow a complete new starfish with only a broken arm.

After the starfish's wrists and body discs are damaged or cut off, they can regenerate naturally. Any part of a starfish can regenerate a new starfish. Because starfish have such amazing regeneration abilities, losing arms and limbs is nothing to them.

Starfish diet and food

The food of starfish varies according to their species. Species whose tube feet do not have suckers, such as regular starfish and sand starfish, eat sediments on the bottom and rock surfaces, such as algae and foraminifera. In addition, sand starfish can also eat larger animals, such as young sea urchins. Species with suckers on their tube feet like to eat shellfish and the carcasses of other animals.

There is a mouth on the ventral surface of the starfish, and inside the mouth is a short esophagus. The esophagus is the starfish's stomach, and its stomach is divided into two parts. The end near the mouth is called the cardiac stomach, and the other part is called the pyloric stomach, which is slightly smaller. When a starfish encounters food, especially some indigestible food such as clams and scallops, the starfish will stick its stomach out of the body.

When starfish hunt for food, they turn out their cardiac stomach to wrap the prey and secrete digestive enzymes. After the food is digested, the starfish retracts its stomach back into the body. It seems that starfish is really unconventional! They turn their stomachs inside out, which can be described as true nausea.