Sea crabs are easier to die than river crabs, and crabs are not easy to die

Yes, sea crabs live in seawater, and they must be put in seawater to temporarily save their lives when they are caught, and they need oxygen to survive during transportation; River crabs can continue to survive when they leave the water.

Sea crabs are easy to die because they die when they are caught.

How long do river crabs really live?

Generally speaking, the lifespan of river crabs is 3 years old and 24 months old. Some of the river crabs that grow along the coast can reach sexual maturity in the same year, although they weigh only more than 10 grams, and their lifespan is only 1 year. Because some breeding units do not know how to distinguish between sexual maturity, they often mistake small crabs for crab seed procurement and stocking, and as a result, 99% of them cannot escape the June pass, which affects stocking and economic benefits.

In some places, far from the sea, for example, Xinjiang and other places, it is not uncommon for river crabs to live for 3-4 years, which is mainly related to the environmental factors of river crabs.

2. The relationship between reproduction and lifespan of river crabs.

As soon as the reproduction of river crabs ends, their lives are almost over, and some river crabs do not have the conditions to enter the ocean, and the clock of life will also stop, and it will die in freshwater waters. The size of the crab cannot determine the age, and the green crab is a sign of sexual maturity. After becoming a green crab, it cannot molt, of course, some people also molt again.

Those environmental factors that affect longevity need to be further studied.

3. The life law of river crabs.

The reproductive migration of river crabs in the Yangtze River basin is roughly from August to December, and the peak period is around the "frost fall". The fishing proverb says: "The cold dew sends the feet, and the frost falls."

At this time, fishermen go down to catch crabs, which is the coming of the annual crab flood. In the season of "beginning of winter", the river crabs in the inland rivers and lakes begin to dormant and overwinter, and the crab flood is basically over.

Because river crabs have always lived in freshwater areas, they can survive as long as there is water, and sea crabs are accustomed to seawater, and leaving seawater is like a baby leaving its mother, and it needs to adapt, so it may die.

How to keep hairy crabs at home from dying? Teach you a few tricks, keep it alive for a week, how to save hairy crabs at home, come in and learn a few tricks, let hairy crabs survive longer, come and see.

In general, the cream crabs and meat crabs bought back in the market are directly placed in the breathable foam box or directly placed in the bucket to raise, without releasing water, because some are saltwater crabs, and the sea crystal should be put in the water for too long, and the crabs that have been too long should be put into the fresh water added to the sea crystal for oxygenation, and the hairy crabs will be directly placed in the fresh water to raise.

Eat while alive. Put back nature when you want to eat it.

Summary. First, the water quality is poor and there are many germs. 1. Poor water quality and many germs.

The crab pond is not disinfected in time, resulting in poor water quality in the pond, and the reproduction of harmful germs is accelerated, so that the crabs are infected by bacteria, suffer from gill rot, etc., and the crabs will die in serious cases. 2. Long-term acidity and alkali are too high. As the temperature gradually rises and the sunlight exposure time is getting longer and longer, the algae in the crab pond photosynthesis is vigorous, which will make the acid and alkali in the water body in the pond too high, resulting in chronic poisoning and death of crabs.

3. The water temperature is too high. When the crab is shed for the first time, if the water temperature in the pond is too high, it will be easy to die due to the weak constitution of the crab at this time. 4. The amount of dissolved oxygen in the water body in the pond is insufficient.

When cyanobacteria and moss break out in the crab pond, the amount of dissolved oxygen in the water will drop significantly, and a large amount of toxins will be released, and the amount of dissolved oxygen in the water in the pond will be insufficient. A large amount of toxins will be released, making the crab hypoxic and poisoned. 5. Stress response.

In high temperature weather, the water environment in the crab pond is destroyed after the rainstorm, which is easy for the crabs to have a stress reaction and suddenly die.

Is there a result. First, the water quality is poor and there are many germs. 1. Poor water quality and many germs.

The crab pond is not disinfected in time, resulting in poor water quality in the pond, and the reproduction of harmful germs is accelerated, so that the crabs are infected by bacteria, suffer from gill rot, etc., and the crabs will die in serious cases. 2. Long-term acidity and alkali are too high. As the temperature gradually rises and the sunlight exposure time is getting longer and longer, the algae in the crab pond photosynthesis is vigorous, which will make the acid and alkali in the water body in the pond too high, resulting in chronic poisoning and death of crabs.

3. The water temperature is too high. When the crab is shed for the first time, if the water temperature in the pond is too high, it will be easy to die due to the weak constitution of the crab at this time. 4. The amount of dissolved oxygen in the water body in the pond is insufficient.

When cyanobacteria and moss break out in the crab pond, the amount of dissolved oxygen in the water will drop significantly, and a large amount of toxins will be released, and the amount of dissolved oxygen in the water in the pond will be insufficient. A large amount of toxins will be released, making the crab hypoxic and poisoned. 5. Stress response.

In high temperature weather, the water environment in the crab pond is destroyed after the rainstorm, which is easy for the crabs to have a stress reaction and suddenly die.

It may be due to the fact that the weather has been too hot lately, resulting in high water temperatures.

Dead river crabs produce large amounts of histamine in their bodies. Eating dead river crabs can cause histamine poisoning.

Histamine is an allergic poison that causes allergic food poisoning.

There are bacteria in the body of river crabs, and when the river crab dies, the bacteria will multiply in large numbers, decompose the crab meat, and produce toxins, which is more likely to cause bacterial infection.

Histamine poisoning does not occur in sea crabs. Therefore, the river crab can not be eaten when it is dead, and the sea crab can be eaten.

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