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First, the pond fish fertilization
In some areas of Central China, Sichuan, and Chongqing, many ponds are still carrying out the traditional breeding mode of the main eel and eel.
1. Farming conditions require an area of ​​5 to 20 mu, a water depth of 1.5 to 3 meters, and sediment of 10 to 20 centimeters, close to the water source, and convenient for drainage and irrigation.
2. Breeding characteristics Use the material circulation between organisms to reduce production costs. After the application of fishery fertilizers, promote the reproduction of plankton and increase primary productivity in the waters. Through the photosynthesis of phytoplankton, the dissolved oxygen in water is increased, the decomposition of organic matter is accelerated, a large number of food organisms are provided for fish, the growth of fish is promoted, and the productivity of fish ponds is improved.
3. The cultured species are mainly raised with white quail, with a small amount of midges such as grass carp, grass carp and grass carp.
4. The proportion of seedlings to be set aside is roughly as follows: é²¢ 60 to 70%, é³™ 15 to 20%, grass carp 10%, carp 5%, stocking size 11.6 to 13.2 centimeters in autumn, and raising some summer flowers (per mu Put 200 to 300 tails.) Insufficient part of the year will be refilled with a part of the spring film. Within the range of 700 to 800 tails per mu, 17 to 18 kg in weight.
5. Before stocking, prepare 7 to 10 days before stocking. Choose sunny lime at noon or drug clear pond.
6, fertilization management 1 Shizujifei: from mid-April to mid-May, in stages will be "Tianchen fish fertilizer" or traditional fertilizer applied to the pond, then fertilize the amount of normal fertilization 2 to 3 times, to cultivate a good water quality standard. Slough ponds and new digging ponds should be fertilized with more water;
2 top dressing: After June, it is necessary to fertilize the fertilizer to ensure that the water. As the temperature rises, it is not appropriate to apply fertilizers such as agricultural fertilizers, and special fertilizers for aquatic products should be applied (but there are many types of fishery fertilizers in the market, and the effective nutrient content is quite different. It is necessary to use nitrogen, phosphorus, and organic matter with high levels of water content. Special fertilizer for promoting growth, such as "Tianchen fishing manure". Generally in June 3 to 5 times a month, each time 2 to 3 kg/mu, 7 to 8 months need about 4 to 6 times a month, each time 3 to 4 kg/mu, according to the specific circumstances of the decision to increase or decrease. Declined after September. The fishery fertilizer was selected to be applied on sunny mornings and used with pesticides and disinfectants for 2-3 days.
3 Water Quality Management: After entering May, it is often necessary to add new water to the pool. Every 20 to 30 days, quicklime is used to keep the water fresh and prevent various diseases. The pH is usually kept between 7.3 and 7.8. The transparency is controlled at 20-30 cm. The water color is yellow-brown or yellow-green. Optimum fish growth.
7, fishing in accordance with the above method, after a year of feeding, the general ferret can reach 0.75 to 1.0 kilograms, up to 0.75 to 1.2 kilograms. Grasp the favorable timing for a balanced listing and catch up.
There are many breeds of freshwater fish, and there are a variety of farming models. There are more than a dozen farming models that are formed according to aquaculture water conditions and aquaculture species and other conditions throughout the country. These are not described one by one here, focusing on the introduction of several fish farming methods. Culture mode, and introduce fertilization techniques and methods.