The interesting phenomenon in crab breeding

In this issue, we contacted relevant experts from Sihong County, Jiangsu Province, which is known as the "hometown of Chinese crabs" on the bank of Hongze Lake. We introduced a comprehensive crab farming technique for the majority of crab farmers.

The Crab Reveals Secretly - "The Victim of Earth's Magnetic Field Change"

Hongze Lake crab tastes good and beautiful, has left the ancient literati and literati left a lot of moving verses. People praise crabs, but they do not appreciate the uglyness of its crawling. In fact, crabs are rampant and frustrated. It is the "victim" of the change in the Earth's magnetic field.

We know that the Earth itself is a magnet, with magnetic south poles and magnetic north poles. The location of the magnetic North and South poles is not fixed, and they have undergone many changes in geological history. The original Magnetic South Pole became a magnetic North Pole, and the magnetic North Pole became a Magnetic South Pole. The Earth's magnetic field continued to turn and it was undoubtedly a disaster for animals that depended on magnetic field orientation. In the crab's inner ear, there is a small magnetic particle for orientation. This small magnetic particle is like a "compass". The ancestors of the crab used to rely on this "compass" to climb backwards and walk freely. Later, when the earth's magnetic field reversed again and again, the crabs could have a big headache. At the beginning, they could cope with it and the number of inversions increased, making crabs useless. When the recent geomagnetic reversal, they do not know what to do and have to run.

The "self-mutilation" crab

In the breeding process, we often see that some crabs are larvae and larvae one by one, or one or two feet are particularly small, or there is a “paper clip”-shaped granulation in the broken step foot roots. These are the results of the "self-mutilation" of crabs.

The "self-mutilation" of crabs is a kind of self-protection of river crabs in the written form. When the river crabs are strongly stimulated, the enemy attacks or mechanical damage, they often break the residual limbs from the base. It is the crab that escapes from the enemy. The effective method of harm. A few days later, a hemispherical nodule grows at the point where the limb breaks, and then it is extended into a rod shape, and it is bent back and reappears. Although the newly grown appendage is smaller than the original, it also has the function of feeding, exercising, and defense. This phenomenon is called "regeneration." The “self-cutting” and “regeneration” of crabs have the function of protecting themselves and defending against predators. It is the result of long-term adaptability of river crabs to competition in the natural world. The occurrence of a large number of self-cuts in breeding ponds may be a problem and an abnormal phenomenon.

Crabs growing in the "reborn"

During the crab breeding process, we often see the crabs that are shelling on the grass head. Crab shelling is a "rebirth" process. The first edge of the carapace was opened, and the limbs of the crab slowly emerged from it. The last two major chelons emerged. The sturdy crabs can be completed within 5 to 10 minutes, while the weak ones can take about one hour. When the shell crab is shelled out, it is the most fragile time. It is also the most dangerous period to be attacked by germs, enemies and even the same species. At this time, the crabs have almost no defensive capabilities and are the most dangerous moments.

The crab's life is short-lived. In its life history, it has passed several stages, such as zoea, large-eyed larvae, juvenile crabs and adult crabs. The wart larvae became large nymphs 5 times and then became shell crabs 13 to 15 times. Crab's growth process is accompanied by larvae, larvae, or crab shells. The larvae once metamorphosis once per larva, also divided into a period. From the big eyelid ecdysis to the first phase of larvae, the body length and body weight of each pupa larvae are increased once every step of the way, from 6 to 7 mg per big eye to 250 g. Crabs need shells dozens of times, and each shell is spent once on the survival mark.

"West Wind, Crab Feet Itching" - Reproductive Travel of Crabs

Every year after the autumn, artificially cultivated crabs will come ashore and the view is very conspicuous. In the middle and lower reaches of the Yangtze River, it is generally from September to November, and the peak period is concentrated in cold dew (around October 10) to frost (around October 25). This phenomenon is caused by the genital migration of crabs. Most of the crab's life is spent in freshwater lakes and rivers. When its gonads mature, they will descend in droves to the shallow waters of the freshwater junction where they mate and spawn. Breeding offspring. The process of such a long journey is the reproductive migration in the life history of the river crab, or the river migration. After the gonads are nearly mature, the crabs can no longer continue to live in fresh water. They must look for a water environment with a high salinity to achieve a new balance between osmotic pressure inside and outside the body. Gonadal development is an intrinsic factor that causes crabs to undergo genital migration. The changes in salinity, temperature, and direction of water flow are the external factors in which crabs can successfully complete the migration. Changes in salinity can affect crab osmotic pressure and promote the further development of their gonads. The salinity is not enough. The crab will continue to swim to the estuary until it reaches a proper salinity to stop the migration. As the saying goes, "The wind is blowing in the westerly wind, and the crabs itch." When the west wind blows and the temperature of the water begins to fall below the temperature of the crab, the mature crabs will seize the opportunity to swim to the estuary, and as the temperature of the water drops, the activity of the crabs also increases. decline.

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