Matters needing attention in introduction of wild giant salamander

Matters needing attention and anti-stress methods for introduction of wild giant salamander

The wild giant salamander caught in the field can cause severe stress reaction or even death in the process of introduction, in order not to make the limited wild giant salamander die as a result of introduction stress reaction, it is necessary to treat the introduced giant salamander and the giant salamander purchased in the market for anti-stress treatment and pay attention to the correct introduction method.

Stress performance of giant salamander

1. Vomiting: the giant salamander spits out all the contents in its stomach after it is put into the water during transportation or at the destination. We have seen a giant salamander spit out two mouse heads and excreted a lot of feces after putting it into the water, and some other giant salamanders immediately spit out a large number of devoured crabs.

2, weight loss: mainly giant salamander excretion of urine and body surface mucus due to stress, so that a large amount of water loss in the body, weight loss up to 30%.

3, do not enter the cave after putting into the culture pond: the giant salamander does not enter the hole all the time after entering the water, wander around the pool or stay in a corner of the pool, these big heels usually have hooks or body injuries.

4. The reason why the body keeps swinging and often opens its mouth to breathe is unknown.

5. Do not eat for a long time: although some giant salamanders enter the cave, they do not eat for a long time because of the strong stress reaction, even if the water temperature, light and dissolved oxygen are in the optimum range. Some of this part of the giant salamander is due to hooks in the body or wounds that have not healed. For example, we have observed that a giant salamander was introduced back into the water for 2 months before spitting out the long hook swallowed into the body, while a male giant salamander reached the intestine because of the long hook swallowed, resulting in multiple perforations in the stomach and intestinal wall. from introduction back to water to death, before and after 7 months, during this period has not eaten; another bitten large scale wound has not healed and has not eaten.

Matters needing attention in introduction

1, appearance detection: first of all, check the appearance of the giant salamander to see if there is trauma, whether the epidermis has ulceration, bleeding and other lesions, whether the activity is normal, whether the hind limbs are strong, turn its abdomen to the sky to see whether it can turn over quickly, and so on. The giant salamander with smooth body surface, powerful hind limbs and rapid turning over has a better physique.

2. Metal detector detection: when introducing a larger individual giant salamander as a parent, special attention should be paid to fishing. Put the giant salamander into the net pocket, lift it in the air, and use a metal detector to explore back and forth from the head to the lower abdomen of the giant salamander, especially pay attention to the throat and upper abdomen, because if there are hooks, they are mostly in these positions. If a hook is detected in the pharynx, the big mouth can be opened to see if it can be taken out with tweezers, otherwise the hooked giant salamander will die and cannot be left as a forehead.

3. Temporary maintenance before transportation: large amounts collected should be temporarily maintained before long-distance transportation to restore their physical strength. Stop eating a few days before transportation and let the food in the stomach be digested before transportation.

4. Matters needing attention in the process of transportation: keep the body moist during transportation, the water temperature should be controlled below 20 ℃, and the air-conditioned car should be used for transportation in order to keep the temperature low. Different individuals should be separated so as not to bite each other. The surface of the transport container should be smooth so as not to scratch the body surface, and the water depth should be just covering most of the body.

Anti-stress treatment of giant salamander after introduction

Anti-stress treatment after introduction of giant salamander is very important. Giant salamander must relieve stress reaction and return to normal condition in a short time, otherwise stress time is too long, physical decline is easy to cause death. The main anti-stress measures are:

1. Adjust the water temperature, light, dissolved oxygen and so on: after the giant salamander is introduced into the culture pond from the wild environment, it is very important to adapt to the water temperature. It is proved that raising the water temperature properly is very effective to relieve the stress of the giant salamander. Andrias davidianus acquired in late autumn or winter can relieve stress reaction and resume feeding in a short time (usually about 1 week) by gradually withering high water temperature (up to 14 ℃-16 ℃) and keeping light ≤ 500Lux and dissolved oxygen ≥ 5mg/L. If the giant salamander is small (0.2-0.4kg/ tail), weak physique, low water temperature (about S ℃), coupled with strong stress reaction, it is easy to cause death. Large groups of traffickers transported back from the wild often reduce their activities and metabolism by adding ice because they are afraid of vomiting and other causes of weight loss. The giant salamander purchased from these salamanders should first pay attention to make the giant salamander adapt to the temperature of the new environment, adjust the water temperature step by step, wait for the giant salamander to vomit the food in its stomach and adapt for two days, and gradually increase the water temperature to 14 ℃-16 ℃ in winter. The practice shows that the higher water temperature is very beneficial to the wound healing of the injured giant salamander and the improvement of the survival rate of imported species and young silver carp.

2, the treatment of injured giant salamander: all introduced giant salamander had better soak with PV iodine 30-50ppm for 30 minutes, and take the following measures to the injured giant salamander: A. wound suture: if the wound is too large, the wound can be sutured with a surgical needle; b apply antibiotics: apply drugs such as sulfonamide ointment, PV iodine and other drugs in the wound. Antibiotic injection: animal sulfa can be used to chew steep sodium, gentamicin 2-4ml/ tail, plus appropriate amount of VC back muscle injection, once a day, for 3 consecutive days as a course of treatment, generally 1 mi 2 courses of treatment; D. shallow water rest: due to the injured giant salamander's poor physique, the water level is deep and easy to cause head dew breathing difficulties, so shallow water rest is appropriate. Keep the water level at 20m / 30cm for 2 days and change the water in one pool to avoid disturbance; E. sprinkle disinfectants all over the pool: disinfect the whole pool with 15-20ppm 's PV iodine or 0.3ppm 's strong chloroform.

3. Keep the water quality fresh: in addition to keeping the water temperature 14 ℃-16 ℃, the water in the pond should be replaced every 4 days to keep the water quality fresh.

4. Timely feeding: after the giant salamander enters the pool, pay attention to observe its activities every day. If the activity is normal and there are signs of looking for food out of the hole at night, it can be fed properly. Can be taken to feed such as animal liver, crucian carp and other fresh materials, the gradual transition to domestication into full-price formula feed.

5. Deworming: when the food intake is normal, the larvae introduced in the field should be fed with insect repellents such as antiprotozoa, tapeworms and trematodes. Because most wild giant salamanders are infected with parasites to varying degrees.