Stocking time
In the Yangtze River Basin and areas south of it, stocking can be done in winter (end of the month) or in spring (mid-to-early month) when the water temperature is ℃℃. Because fish have poor mobility at low temperatures, they are easy to catch and are less likely to be injured during operation. The advantage of winter release is that it can eliminate the need for fish species to survive the winter in ponds, allowing fish species to adapt to the environmental conditions of adult fish ponds earlier and extending their growth time. The advantage of spring release is that the water in the adult fish pond can be drained for winter repairs. It can be flexibly controlled according to the production situation and pond conditions.
. Precautions: Operate carefully to avoid damaging the fish body. Choose sunny days for stocking to facilitate operation and transportation. In order to prevent fish diseases, the corresponding fish species should be soaked and disinfected with drugs and the fish stocking work should be recorded for future reference.
Adult fish breeding and management
All material conditions and technical measures for fish farming. In the end, it can only work through the daily management of fish ponds. The basic contents of daily management include the following aspects.
Fertilization and feeding Intensive fish ponds with mixed culture and close stocking must be fertilized and fed with artificial feed in large amounts to achieve high yields. Therefore, fertilization and feeding have become the central tasks of daily management of fish-based fish ponds.
1. After fertilizing fish fingerlings, top-dressing must be carried out appropriately according to the water quality of the fish pond during the fish culture stage. The purpose of top-dressing is to continuously replenish nutrients in the water and provide natural bait for the reproduction of silver carp, bighead carp and other fat-water fish. .
Fertilization should follow the three-step fertilization method, and master the principles of timely, even and small amounts multiple times to keep the pool water fertile, lively, tender and refreshing. Transparency in centimeters. For ponds that mainly raise silver carp and bighead carp, water should be cultivated according to both ends (that is, spring and autumn). A month ago, visibility could reach about centimeters. Because the water temperature is low in spring and autumn, it is suitable for phytoplankton reproduction and is also beneficial to the growth of silver carp and bighead carp. Therefore, various organic fertilizers can be applied in large quantities. All kinds of manure are more effective when splashed at noon on a sunny day. However, attention should be paid to avoiding food courts, and in areas where fertilizer sources are insufficient, a large amount of green manure should be used to inject fertilizers from local materials. This is an effective way to solve the shortage of fertilizer sources in commercial fish bases. During the summer (month) when fish grow rapidly. Because the water temperature is good, the amount of feeding is large, and the water quality is generally fertile. You can apply less or no top dressing. At this time, the water contains more nitrogen and less phosphorus. The ratio of nitrogen to phosphorus is seriously imbalanced. If top dressing is to be applied, sprinkling phosphate fertilizer on sunny days is more effective. It not only plays a major role in promoting the growth of phytoplankton but also improving pond productivity. Moreover, it is not easy to damage the water quality, which is beneficial to the fish in the pond. Phosphate fertilizer is generally applied once a day. The average water depth per mu is meters, and each application requires 1.0 kilograms of Yutulin or 1.0 kilograms of superphosphate. Dissolve the phosphate fertilizer in water first and then sprinkle it over the entire pond in the morning on a sunny day. On the day of fertilization, do not stir the pool water (pulling the net, adding water, turning on the aerator, etc.) to extend the floating time of phosphate fertilizer in the water and reduce the adsorption and fixation of colloids such as pool mix.
Russian golden grass carp