Snapping Turtles, the scientific name Snelted Slington (Cneldra Serpentina), is an economic turtle of fast growth and high nutritional value. Since 1996, when the United States introduced the successful trials in China, it has become a hot species in the turtle breeding industry. The supply of turtle seedlings is in short supply. The turtle seedlings (cub hatchlings) required for rearing snapping turtles mainly rely on imports. The number of domestic artificial breeding is extremely small. This is because there is no mature technology for artificial breeding of snapping turtles in China. To this end, we conducted a preliminary study on artificial propagation techniques of snapping turtles from March 2002 to August 2002.
First, materials and methods
1. Incubation of spawning spawning ponds and turtle hatching boxes (1) Incubating spawning spawning ponds are concrete pools with a water depth of 50cm and an area of ​​200m2, of which the water surface is 140m2 and the spawning ground (beach) is 60m2;
(2) The hatching box of turtle eggs is made of plastic with a specification of 60cm40cm20cm.
2. Pro-Turtle Source: Select from the United States the weight of 4kg ~ 5kg, robust, mature wild snapping turtle as a turtle, a total of 50 groups, each group male to female ratio of 2:1.
3. Turtle incubation: Snapping Turtles are mated from April to May and from September to October every year. From April to May, it was the first mating period, and spawning began. During this period, we undertook intensified breeding of invertebrates and the cultivation density was 0.75 birds per m2. Feeding adopts regular, fixed-point, qualitative, quantitative methods, feeding high-quality artificial compound feed, and feeding a small amount of fresh fish, shrimp, vegetables, etc. to ensure its nutritional balance. At the same time, we monitor the physical and chemical indicators of water quality, timely change water, discharge sewage, and keep water clean.
4. Spawning and hatching: Check the spawning site every morning to the spawning ground. Make a mark when the nest is found, and wait until the next day or the third day to retrieve the eggs. The eggs collected every day are hatched in the prepared incubator. Put 5cm thick coarse river sand on the bottom of the incubator, put 5cm thick fine river sand on it, then place the eggs on the sand (animals with white spots) and cover the eggs with 3cm above it. Thick sand, sponge covered with sand. All sand must be sanitized and cleaned beforehand to prevent harmful bacteria from invading the eggs. The incubator should be inspected twice a day. When the sponge and the top layer of sand are dry, they should be moistened and moistened, so that the sand can be kept in the hands to form a mass and loosen to the extent that it is loose. The incubation temperature is controlled at 32°C. After 65 to 70 days, hatchlings can be hatched.
5. Juvenile turtle raising: After the hatchling is hatched, allow it to move in the incubator for several hours. After the egg yolk is completely absorbed, put it in clean water and keep it at a depth of 2 cm to 5 cm. The opening feed is silk larvae and the hatchling grows. Lively and strong.
Second, the results in the spawning period of snapping turtles, we collected a total of 523 eggs, until August 5 hatched a total of 318 hatchlings, the hatching rate was 60%, and raised 312 juvenile turtles, the survival rate of 98 %.
III. Analysis and discussion From the results of the trial, the procreation rate of hatchlings and the hatching rate of hatchlings were both low, and there was a big difference between the technical indicators we requested. The reasons for this result were as follows: point:
1. The incubating density of the pro-turtle is too large, which affects the development and maturation of the eggs.
2. Probiotic feed nutrition ratio is unreasonable, fresh live animal feed is less.
3. The humidity in the incubator varies greatly and is not stable enough. Humidity is too high, sand permeability is poor, and embryonic development is deficient in oxygen. The humidity is too small, the embryos lack water, and they easily die.
4. The environmental noise affects the procreation and landing of turtles because it is just from the quiet environment to the current artificial noisy environment. It is difficult to adapt in the short term, and a large number of eggs are produced in the water and it is difficult to collect and hatch.
5. In the later period, the water temperature is high and the light is strong. The lack of shades also affects the development and maturation of the eggs, resulting in too little egg production.
First, materials and methods
1. Incubation of spawning spawning ponds and turtle hatching boxes (1) Incubating spawning spawning ponds are concrete pools with a water depth of 50cm and an area of ​​200m2, of which the water surface is 140m2 and the spawning ground (beach) is 60m2;
(2) The hatching box of turtle eggs is made of plastic with a specification of 60cm40cm20cm.
2. Pro-Turtle Source: Select from the United States the weight of 4kg ~ 5kg, robust, mature wild snapping turtle as a turtle, a total of 50 groups, each group male to female ratio of 2:1.
3. Turtle incubation: Snapping Turtles are mated from April to May and from September to October every year. From April to May, it was the first mating period, and spawning began. During this period, we undertook intensified breeding of invertebrates and the cultivation density was 0.75 birds per m2. Feeding adopts regular, fixed-point, qualitative, quantitative methods, feeding high-quality artificial compound feed, and feeding a small amount of fresh fish, shrimp, vegetables, etc. to ensure its nutritional balance. At the same time, we monitor the physical and chemical indicators of water quality, timely change water, discharge sewage, and keep water clean.
4. Spawning and hatching: Check the spawning site every morning to the spawning ground. Make a mark when the nest is found, and wait until the next day or the third day to retrieve the eggs. The eggs collected every day are hatched in the prepared incubator. Put 5cm thick coarse river sand on the bottom of the incubator, put 5cm thick fine river sand on it, then place the eggs on the sand (animals with white spots) and cover the eggs with 3cm above it. Thick sand, sponge covered with sand. All sand must be sanitized and cleaned beforehand to prevent harmful bacteria from invading the eggs. The incubator should be inspected twice a day. When the sponge and the top layer of sand are dry, they should be moistened and moistened, so that the sand can be kept in the hands to form a mass and loosen to the extent that it is loose. The incubation temperature is controlled at 32°C. After 65 to 70 days, hatchlings can be hatched.
5. Juvenile turtle raising: After the hatchling is hatched, allow it to move in the incubator for several hours. After the egg yolk is completely absorbed, put it in clean water and keep it at a depth of 2 cm to 5 cm. The opening feed is silk larvae and the hatchling grows. Lively and strong.
Second, the results in the spawning period of snapping turtles, we collected a total of 523 eggs, until August 5 hatched a total of 318 hatchlings, the hatching rate was 60%, and raised 312 juvenile turtles, the survival rate of 98 %.
III. Analysis and discussion From the results of the trial, the procreation rate of hatchlings and the hatching rate of hatchlings were both low, and there was a big difference between the technical indicators we requested. The reasons for this result were as follows: point:
1. The incubating density of the pro-turtle is too large, which affects the development and maturation of the eggs.
2. Probiotic feed nutrition ratio is unreasonable, fresh live animal feed is less.
3. The humidity in the incubator varies greatly and is not stable enough. Humidity is too high, sand permeability is poor, and embryonic development is deficient in oxygen. The humidity is too small, the embryos lack water, and they easily die.
4. The environmental noise affects the procreation and landing of turtles because it is just from the quiet environment to the current artificial noisy environment. It is difficult to adapt in the short term, and a large number of eggs are produced in the water and it is difficult to collect and hatch.
5. In the later period, the water temperature is high and the light is strong. The lack of shades also affects the development and maturation of the eggs, resulting in too little egg production.