How many times a month does a lobster molt, how often does a crayfish molt, and why do crayfish molt

Lobsters typically undergo 10-word shelling in their first year of life and then shell about once a year before reaching maturity.

When lobsters reach adulthood, they are generally shelled every three years.

Lobster shelling 1 time 3 times a year in the artificial breeding pool, crayfish more than lobster shelling times, usually a lobster weighing less than 200 grams per year shelling 2 times 3 times, a weight of more than 300 grams per year shelling 1 time 2 times, a weight of more than 300 grams per year shelling 1 time 2 times, each shelling cycle, a weight increase of 50% 80%.

Crayfish have to withdraw their shells every time they grow, about one to two months, and the molting is to grow big and strong.

Lobsters grow by molting, and the new shell hardens after 12-24 hours. Under the condition of water temperature 25 -30, rearing for 6-8 months, the weight can reach 60-150 grams. The general trend of lobster growth is:

From post-hatching to 20 g of body weight, the growth rate is an accelerated increase; At the stage of 50-100 grams, the growth rate remains at a relatively stable level, beyond which the growth rate tends to decline. As a result, an inverted U-shaped growth curve is formed. Molting is divided into two kinds: long molt and reproductive molting, after the juvenile shrimp is separated from the mother, it quickly enters the first molt, replaced with a soft and wrinkled new skin, and quickly absorbs water and grows, this is the growth molt, from the larvae to the adult body molt a total of 11 times.

Female shrimp begin to reproduce and molt after sexual maturity, and must perform reproductive molting before each mating and spawning in the future.

The growth rate of crayfish is very fast, from the seedling stage to the commercial shrimp only about three months.

Crayfish need to molt five or six times, usually once every half a month. The lobster's body grows continuously, and its carapace cannot be enlarged, and the body grows without the carapace enlarged, and the animal will suffocate in the carapace, "Therefore, it needs to shed the old shell and grow a new shell." ”

Copulation time is 10-30 minutes. 3-10 hours after mating, the female begins to lay eggs, which are one-time spawning, and the eggs produced adhere to the gastropod. Grow under the protection of the mother for a period of time.

Crayfish grow by molting, and the new shell hardens and returns to normal after 12-24 hours.

According to the activity and feeding conditions of crayfish, the molting cycle can be divided into four stages: intermolting period, premolting period, molting stage and late molting stage.

1. The crayfish feeds vigorously during the interval between the shedding holes and the lifting of the shell, and the carapace gradually becomes hard and hard; In the early stage of molting, from the crayfish stops feeding to the beginning of molting, this stage is when the crayfish prepares for molting.

2. When the crayfish stops feeding, the calcium in the carapace transfers to the calcium stone in the body, making the calcium stone larger, the carapace thinner and softer, and separated from the endocortical layer.

3. The molting period is from the crayfish lying on the side to the beginning of the carapace completely shedding, the duration of this stage varies from a few minutes to more than ten minutes, most of the ones we observe are 5 10min, and the crayfish are easy to die if the time is too long.

4. The late stage of molting is from the crayfish snake molting to the beginning of feeding Zhinabi, this stage is the process of the evolution of the cortical layer of the crayfish carapace to the carapace, the water enters the body from the cortical layer, the body gains weight and increases, the calcium of the calcium stone in the body is transferred to the cortical layer, the cortical layer becomes hard and thick, and the stage is the carapace, and the calcium stone in the body finally becomes very small.

Some foreign scholars divide the late molting stage into the soft shell stage and the thin shell stage, and divide the molting cycle into five stages: the molting interphase, the early molting stage, the molting stage, the soft shell stage and the thin shell stage.

Why do crayfish molt?

Lobsters are crustaceans that grow by molting, and multiple molts occur throughout the growth process from juvenile to adult.

In the process of breeding, we often encounter the problem of crayfish soft shell, death caused by molting attempts, and being eaten by the same kind during shelling. In order for crayfish to be shelled smoothly, preparations should be made before the crayfish are shelled.

Summary. We are happy to answer for you, larval stage: generally every 2-4 days to molt 1 shell, larvae after 3 molts will enter the juvenile shrimp stage.

Juvenile shrimp stage: generally molt once every 5-8 days. Adult shrimp:

Generally, the shell is molted once every 8-15 days. Crayfish generally need to molt 11-12 times from larvae to commercial shrimp, molting is an important sign that it begins to grow and develop, usually every molt it will grow a little bigger, and the new body after molting will harden after 12-24 hours.

We are happy to answer for you, larval stage: generally every 2-4 days to molt 1 shell, larvae after 3 molts will enter the juvenile shrimp stage. Juvenile shrimp He Hong rental stage:

Generally, the shell is molted once every 5-8 days. Adult shrimp: generally molt once every 8-15 days.

Crayfish from larvae to commercial shrimp generally need to molt 11-12 times, Zen Zhao molt is an important sign that it begins to grow and develop, usually every 1 molt shell it will grow a little, and the new body after molting will harden after 12-24 hours.

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What are the precautions for the management of crayfish shelling:

1. Preliminary work.

As long as we do a good job in other links, we can ensure the normal molting of lobsters, and we have to do a lot of work in the early stage, such as the maintenance of water quality and water bodies, the planting of aquatic weeds and aquatic plants, the disinfection of ponds, the removal of natural enemies, and so on. Having a good water quality can provide a better growth link for the lobster, and having good aquatic weeds can provide some bait for the lobster and a safe space for the lobster to molt, these are all things we need to pay attention to.

2. Appropriate calcium supplementation.

After the lobster enters the pond, we need to pay attention to the feeding of the bait, during the lobster molting, appropriate calcium supplementation, and in the food bait to provide more bait with higher calcium content such as screws, when feeding, we must do a good match, plant bait and animal bait must have, do not cause nutritional imbalance.

3. Observe aquatic plants.

In the breeding process, pay attention to the growth of aquatic weeds and the amount of dissolved oxygen in the water body, the growth of aquatic plants is not good, it proves that the water body is too thin, and fertilizer water is needed, because there are no good aquatic plants, it is impossible to raise good shrimp, lobsters have a very high demand for oxygen, but also pay attention not to let the water body lack oxygen for a long time, lack of oxygen will cause lobsters not to molt, and may lead to lobsters in the process of molting, due to lack of oxygen and unsuccessful molting leads to death.

4. Pay attention to the shelling time of crayfish.

The molting of lobsters is not a fixed time, not that the same batch of seedlings of the same specification is put down, and after a period of time, they will molt together, but according to the eating and other conditions, there are first and last, basically there will be lobsters molting every day, so we must remember that when there are lobsters in the pond, we need to observe more and do not operate blindly.

Shrimp start to eat about 1-2 days after molting, because when the shell is relatively soft and unable to stand, after 1-2 days, the epidermis begins to calcify and slowly hardens, and then it will officially start eating.

The larval stage of crayfish generally molts once every 2 4 days, and the larvae enter the larval stage after molting 3 times. In the crayfish seedling (juvenile) stage, molt once every 5 8 days, and in the adult stage, usually once every 8 15 days.

The molting of crayfish is closely related to water temperature, nutrition and ontogenetic stage. If the water temperature is high, the food is relatively abundant, and the development process is early, the molting interval is short. Sexually mature female and male shrimp usually molt 1 2 times a year.

It has been measured that the total length of crayfish with a total length of 8 11 cm can grow by 1 3 cm for each molt of the shell.

Lobsters are crustaceans that grow by molting, and multiple molts occur throughout the growth process from juvenile to adult. Under suitable environmental conditions, the newly hatched juvenile shrimp have a short time between molting each time, once every 1 to 2 days, and the molting interval will be extended as the body grows. During the molting period, the shrimp is most susceptible to predators or the same kind of predators, and there is a fish called crab tiger, which eats crab and shrimp that have just finished their shells.

Lobster shelling 1 to 2 times a year in the artificial breeding pool, crayfish more than lobster shelling, usually a lobster weighing 20 grams of coarse and below the shell 2 times to 3 times a year, a weight of more than 30 grams per year 1 to 2 times, a weight of more than 30 grams per year 1 to 2 times, each shelling.