Although it has been a while since it entered the winter, the current climate in the Pearl River Delta is still relatively stable. With most of the raised turtle products that have reached the market specifications gradually listed, the harvest has come to an end. The current primary work of turtle farmers is how to farm safely and overwintering, which lays the foundation for the breeding of ponds in the spring. The author puts forward several suggestions for the breeding of greenhouse turtles in the Pearl River Delta for the reference of farmers:
First and foremost, the temperature must remain stable and change must not be great. The soft-shelled turtle (Cyprinus carpio) is a semi-aquatic thermophilic animal and is very sensitive to changes in the ambient temperature. Excessively high or low temperatures or rapid changes in temperature are not conducive to the survival, growth, and reproduction of soft-shelled turtles, especially as a current breeding subject. Childish and young.
The optimum growth temperature of the soft-shelled turtle is between 28 and 32°C. Exceeding this range will affect the feeding and growth of the soft-shelled turtle. The daily change of water temperature is best controlled within 1～2°C, and it is better not to exceed 3°C. Severe water temperature changes will make it difficult for juveniles to adjust physiologically. The metabolic process of the body is prone to disorder, and it is more likely to cause disease. Such as a cold and so on.
In wintering culture, light is easily overlooked. After winter, the sunshine duration is relatively short, and the winter shed can be properly supplemented with light. According to relevant research data, supplemental illumination has a significant increase in the growth rate of soft-shelled turtles, and can also increase the survival rate. At present, many farmers have neglected this point. It is advisable to try it.
In winter, it is also necessary to properly control the temperature and humidity. This year, the southern cold air came late and the outdoor temperature was relatively stable. If farmers have better greenhouses, ventilation can be properly increased. From the north to the south, it is suggested that the ventilation can be increased in the south and slightly smaller in the north, while the east-west canopy and the east and west surfaces can be increased in ventilation. The stronger light can be opened for 1 to 2 hours at noon to promote oxygenation. Carbon dioxide emissions from low-level water are conducive to the growth of juvenile and young larvae. The humidity is less than 40%, which is relatively easy to control before the beginning of spring. The humidity will rise after the beginning of spring and the proper control of ventilation and humidity shall be taken care of.
In winter, the management of water quality is stricter than in other seasons. Water quality indicators of winter sheds are the most vulnerable to ammonia nitrogen content, generally less than 0.3 mg / liter is ideal, ammonia-nitrogen over high turtles prone to gastrointestinal discomfort, and lead to skin, rotten legs, rotten mouth and other diseases.
In the control of water color, transparency and pH, it is best to keep the yellow-green color in the water. If the water is too dark, adjust the photosynthetic bacteria and Bacillus with appropriate amount of quicklime and adjust the amount of the aerator to cultivate the water color at noon. This makes the dissolved oxygen in the water more ideal and more conducive to the growth of juvenile and young larvae.
Over winter, juveniles and juveniles are small and have poor resistance. In addition to guaranteeing good feeding, greenhouses should also be properly supplemented with multi-dimensional, microbial preparations, liver and gallbladder herbs to protect the gastrointestinal hepatobiliary function, making it an improvement in survival. Rate and growth rate protection.
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