Artificially hatching soft-shelled turtles in wooden boxes has the advantages of large and small scale, easy management, economical and practical use, and high hatching rate. The hatching and hatching rate is as high as over 90%. Now we introduce its methods to everyone.
1. Choose sand. The hatching of soft-shelled turtle eggs requires proper temperature, humidity, and ventilation. If the sand is too coarse (more than 1 mm in diameter), although the sand environment in contact with the eggs is well ventilated, water retention is poor, and proper humidity of the sand cannot be maintained for a long time, which will affect the hatching rate; if the sand is too fine (grain size less than 0.1 mm) Although the water retention is good, it is easy to compact and cause the eggs to die. Sand with a particle size of 0.5-0.6 mm is ideal.
2. Disinfection. Put the selected sand in the pot, add fresh water, stir and pour the muddy water. Repeatedly and repeatedly, wash away the mud in the sand. Pour the net sand into a 20 mg/kg bleach solution and sterilize it for 2 days. Then filter out the sand, rinsing with cold boiled water to remove the contained medicine, and leave it for drying. Net sand can also be spread out and used after 2 to 3 days exposure. The pine and fir boxes used for hatching should also be washed and disinfected.
3. Packing. Smooth the sand with cold water to the appropriate moisture content. The soft-shelled turtle has stronger resistance to low humidity and weaker resistance to high humidity. The sand moisture content is 5%~15%. If more than 25%, the egg is easy to die; if it is less than 3%, the moisture in the eggs will evaporate and affect the development. Such as holding a well-tuned sand into a group, naturally after the sand group spread to the ground, even holding the sand into a group, let loose a little loose, proved that the humidity is appropriate. Otherwise it must be reconditioned.
Sand boxes can be large or small, 35 cm deep and 20 cm deep after the eggs are laid.
4. Select eggs. Turtle eggs need to be inspected for fertilization when selecting eggs from the spawning sand bed. If the egg has a white circle at one end (the end is called animal pole), it means that it has been fertilized. If it is not fertilized, it should be put back into the sand bed and kept in place. After 24 hours, a white circle appears. Then it is placed in the fertilized egg to hatch, otherwise it should be removed.
5. Ovulation. The well-selected fertilized egg animals will be directly above, and each egg will be gently placed on the sand plane in the box. In order to make full use of space, ovulation can also be increased to two floors, but most of them are discharged to facilitate management.
After the eggs are laid out, cover the eggs with a layer of sand that has been well-packed with humidity. The thickness is 2 to 3 cm higher than the surface of the eggs.
When ovulating, it is important to note that: 1 Animals must face upwards, otherwise they may affect the embryonic development or the shelled turtles cannot be drilled smoothly.
2 eggs in batches at different times must be marked separately for observation and management;
3 Because the edge of the box is easy to dry, ovulation should not be too close.
6. Insulation. The best sand temperature during the incubation period is around 30°C. Below 25°C, embryos develop slowly; at 38°C to 40°C, embryos die within a few hours. In order to maintain the optimum temperature, summer temperatures are high, and ventilation should be used to cool down; when temperatures are low, door and window insulation should be closed.
In the area south of Yangtze River, turtles spawn from June to August, and in July, the indoor temperature will not be as high as 35°C, nor will it fall below 24°C. It is suitable for hatching eggs.
7. Moisturizing. That is, the moisture content of sand during the entire incubation period is 5% to 15%. Hot sunny day, high temperature, rapid evaporation of water, such as sand is still wet, can not sprinkle water; if the sand close to the egg is dry or even white, you can use hand cold water evenly sprinkled on the sand surface. A few minutes later, when mixing sand, be careful not to vibrate the eggs below so as not to affect the embryonic development.
8. Shell out. At about 30°C, the plant poles (as opposed to the animal poles) appear pink in 5-8 days after the eggs are released, the plants are red-black in 20-25 days, at this time the juveniles have been formed, and the plants are visible at 26-30 days. Black embryos; 33 days later, the whole egg became white, and animals and plants could not be distinguished. Therefore, the appearance of eggs can basically predict the hatching time of juveniles. After 35 days of incubation, a large flat-bottomed container was buried in wooden sand. A 2 cm thick sand was placed in the container, and the water surface was about 5 cm higher than the fine sand surface. When the juvenile fish hatched, they crawled into the container because of their natural water-repelling properties. If the juveniles did not find water after they came out of the shell, they would die.
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