What is sea urchin

Issuing time:2021-06-21 10:06

This is people's first impression of sea urchins


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Just a little poke at the sea urchin

Pry open its hard shell

"In depth" understanding of the inner characteristics of sea urchins

Only in this way can we find something valuable about it

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In sea urchins

There's a substance that looks like an orange petal

Yellow, soft

It's sweet to bite

Sea urchin sea urchin sea urchin


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Sea urchin is an ancient marine organism with a history of hundreds of millions of years. It is regarded as one of the oldest marine organisms on earth.

The sea urchin almost encloses its whole body in a spherical or discoid mineral shell. The surface of the shell is covered with defensive spines and forked spines, which is commonly known as "spines".


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Sea urchins have a wide range of food habits, some like to eat meat, some like to eat grass, some species of sea urchins especially like to eat seaweed, and they have won the reputation of "algae eating weapon".

Most sea urchins are very "homely" and like to live in rocks, coral reefs and hard seabed. Generally, sea urchins only move when they want to eat, that is, to look for food. If there is a lot of delicious food around, sea urchins will be even more lazy to move. A few centimeters a day is regarded as fitness.


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There are more than 900 species of sea urchins in the world after the extinction of ancient creatures. However, what people are most concerned about is not the tenacious vitality of sea urchins, but the top taste enjoyment they bring to people..

When we eat sea urchins, what are we eating?


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Sea urchin is a kind of food suitable for raw food, which can best retain the freshness and sweetness of sea urchin itself. It tastes like "ocean". Most people who like sea urchin prefer to eat it raw.

When we eat sea urchins, we remove the shell and only enjoy the yellow part of sea urchin.

What is sea urchin yellow? Where is it in the sea urchin?


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The answer can refer to crab roe. Sea urchin yellow, the gonad of sea urchin, is equivalent to the ovary and seminal vesicle of sea urchin. Different from other animals, the total weight of gonads of sea urchins can account for two-thirds of the internal tissue of sea urchins, which can be said to be very beneficial.

Sea urchin yellow tastes silky and sweet. The gonad contains a lot of fatty acids, amino acids and polypeptides, creating a unique taste of sea urchin yellow.

"Even if you don't take the initiative, we can have children"


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There is a saying circulating on the Internet: some young people sometimes dare not take the step of courtship because of shyness. When they think of their original regret years later, they will sigh, "if they had taken the initiative, now we all have children."

For humans, the story may be normal. But for sea urchins, it doesn't happen at all.


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The reason is very simple. The way sea urchins give birth is so special that they don't need to "blend" with each other to have offspring.

The vast majority of sea urchins are hermaphroditic, male or female, the shape does not look much different, and some species are hermaphroditic.

When the sea urchin reaches the mature stage, it will begin to move, rubbing hands, ready to perform the important task of reproduction. Sea urchin is a kind of gregarious animals, when breeding, they will gather in a local sea area.


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Once one of the sea urchins throws its own germ cells into the sea, whether it's sperm or egg, it will send information to all sea urchins nearby like a trumpet, and "call" all sexually mature sea urchins in this area to do the same.

Then, it's time for excitement! In the vast deep sea, there is no monitoring, no onlooker's gaze, sea urchins can freely and bravely indulge, let their floating germ cells chase each other in the water, complete the reproductive task


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The color of sea urchins generally looks very dark. We often see black, dark purple and so on. But in fact, there is a large family of sea urchins in Shanghai, and there are too many green, olive and brown sea urchins.

Most of the sea urchins are negative phototaxis and often stay in a dark environment. So sometimes when the light is dark, it may be really confusing to put a ball of chestnut hair and a live sea urchin together.


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In daily life, if you want to verify whether the sea urchin is alive, the method is very easy. As long as you gently poke its mouth, the living sea urchin will take the initiative to contract.



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