Treatment technology of dystocia of giant salamander

Observation on oviposition of giant salamander

After injecting exogenous hormone into the mature female of giant salamander, the mature yolk granule is separated from the ovary (that is, giving birth), and after falling into the abdominal cavity, it needs to be ascended to the tubal trumpet near the front limb of the pleura with the help of the movement of the abdominal wall muscle. then enter the fallopian tube to carry out a series of physiological processes to wrap the yolk particles to form adhesive tape, and finally produce in vitro. In the case of "internal production", there is an optimal period of time for mature eggs to be excreted from the fallopian tube to the outside body, and the egg bands produced at this stage are of good quality and have better fertilization ability. After years of spawning experiments, we have explored a set of artificial methods for promoting labor of giant salamander, which solved the technical difficulty of delayed spawning caused by the lack of stimulation to the external ecological environment under the condition of full artificial induced labor, and significantly improved its fertilization rate. After the induction of labor, the female giant salamander, gonad development is better, after about three days will appear abdominal enlargement, which is a sign before labor. After artificially promoting postpartum giant salamander females, most of them like to crawl along the edge of the pool, and then stay in the corner near the pool wall, head slightly sticking out of the water, rapid and frequent ventilation, while about to produce tape, the cloacal hole is relaxed and open, some will also appear the body swings violently from side to side, and finally produce the yolk tape in vitro.

Treatment techniques of dystocia in female salamander

In artificial labor, some female salamanders have the phenomenon of dystocia, only abdominal enlargement, delayed spawning, or even if the egg band, but easy to break automatically. These are all cases of dystocia, for these conditions to be found in time, it is necessary to adopt the method of artificially promoting labor. The specific operation techniques are as follows: the technician carefully enters the parent salamander pool, gently presses the abdomen with his hand, and excretes urinary bladder. Then gently touch the back, ventral surface, body fold and cloaca with hands. Can also gently pick up the female salamander from the water, and then along its head, trunk, abdomen to do gently caress. To achieve the purpose of overcoming tension and relaxing the female salamander waiting to give birth, so as to facilitate smooth delivery. Do it every hour, generally do more than 3 times in a row, if handled properly, it can promote the female salamander to lay eggs. However, it should be noted that when promoting labor, technicians should first trim their nails, and then disinfect them with 0.05% potassium permanganate to avoid injury to giant salamanders. In addition, increasing current stimulation can also play a role.

Postpartum management

After the end of the spawning of the parent salamander, the female and male of the parent salamander should be carefully farmed in a pool with the same water temperature as the original pool, because there is often chase in the process of spawning, resulting in damage to the body surface such as mucous membrane and skin; and the physique of the parent salamander that has just laid eggs is also relatively weak, so that the giant salamander will not be hurt when it is removed from the spawning pool or when changing water later, and the wound should be smeared with anti-inflammatory drugs when it is found that the injured parent salamander is injured. When feeding, you should also be careful and careful, and observe its activity and appetite. Begin to feed less, and feed some bait with good palatability, wait for the physique to return to normal, then feed according to the standard and carry out normal management. Especially after parent salamander breeding, due to improper technical treatment, or excessive hormone dose, sudden change in water quality and other reasons, sometimes a large number of parent salamander deaths often occur, which is a very heartache problem. The author thinks that prevention should be carried out from the following four aspects.

1, the problem of water temperature: after spawning, the physique of the parent salamander is relatively weak, and the parent salamander can not be fished into the spawning pond at will. As a result, the temperature difference of the water is often too big, and the giant salamander gets cold and gets sick, resulting in the death of the parent salamander in serious cases. For this reason, postpartum female and male parent salamanders should be put back into the original pool as much as possible.

2. Feeding problem: after intense reproduction, the giant salamander's physique is weak, the digestive function is also affected, and the appetite is also poor. in this case, it is necessary to reduce bait and feed easily digestible bait until the pro-salamander activity and appetite are normal. to restore normal feeding.

3. Injury problem: during the breeding process of giant salamander, skin scraping and falling off caused by manual movement, coupled with the high temperature at this time, is the breeding season of germs, bacteria and parasites can swoop in from the body surface wounds, and it is easy to make the parent salamander die from the disease. for this reason, usually put a little gentamicin (concentration of 1 g / m3) in the pro-salamander pond for 1 hour each time. Use it for 5 times.

4. Water quality problems: due to the dystocia of the giant salamander, or the gonadal development is not mature enough, but after the end of reproduction, the gonads of female and male giant salamanders become more and more mature, and some female salamanders produce eggs whenever they are exposed to new sponges and foraging. Male salamanders also secrete male hormones and even excrete spermatozoa, so that these secretions or sperm dissolve in water, although not formal spawning. Make the water white, if it is not changed in time, it will stink and spoil. Therefore, it is necessary to timely observe the postpartum reaction of the parent salamander and fish out the egg belt or eggs in time. If there is no running water culture condition, the method of changing water three times a day should be adopted. If there are running water culture conditions, the water flow should be kept smooth to ensure good water quality.