Pay attention to winter and spring fish
First, pay attention to the neatness of fish species.
If the size of the fish species in the same fish pond is irregular, the ventral line is straight, the fish tail is long and thin, and the fish is placed in a fish cage for 30 minutes, there will be weakness, dullness, and some even have symptoms of disease. This kind of fish can not be released into fish ponds, nor should it be transported over a long distance. It can reduce the stocking density or transfer to fertile water. If you are really sick, you need to be treated in time.
Second, pay attention to the body length of fish.
Whenever carrying on the net exercise, the fish species jump violently, catch two fish species on the grass, can jump more and more in a short time, the mouth opens and closes forcefully, the body movement is agile. The fish has a straight body surface, a thick back, a broad abdomen, gray or silver-white fins and scales, and bright and shiny eyes. The size of the same kind of fish in the same pond is uniform, there is no sign of invasion of diseases and insect pests, and the quality of this kind of fish is good.
Third, pay attention to the fat and thin fish ponds.
The fat and thin water quality of fish ponds is directly related to the physique of fish species. As the saying goes, "raise a pond of fish, first raise a pond of water." The transparency of fish pond water is between 26ml and 30cm, showing light green or tea-brown, indicating that the water quality is good. Fish species raised in such water quality are generally in good physique. If the water color of the fish pond is light, blue, green, clear, mixed layered water color appears in the water, coupled with a large number of stocking, there will be differences in the physique of fish species. Fourth, pay attention to the activities of schools of fish. To observe the physique of fish species in the fish pond, we should pay attention to the number of dead fish in the pond and whether the fish species swim in groups. If it is found that most fish species swim scattered on the surface of the fish pond and the fish body is black, the physique of the fish species is poor, on the contrary, the physique of the fish species is better.
- Prev
Fishing techniques of large silverfish
1. Preface in 1995, the Ministry of Agriculture and the Ministry of Water Resources jointly issued the notice on accelerating the Promotion of Silverfish Transplantation and Proliferation Technology, which set off an upsurge of large silverfish transplantation in the whole country. In the past ten years, the cause of transplantation and proliferation of large silverfish has been widely developed in the north, especially in Inner Mongolia, and good results have been achieved in lakes and reservoirs. When the large silverfish in the transplanted waters reached the fishery effect, that is, the large silverfish formed a high number and stable population and was naturalized.
- Next
Key techniques of hot water fishing
In summer and autumn, the fish carrying capacity of intensive culture ponds has reached saturation, and some adult fish have reached the market specifications, which can be put on the market, which is not only conducive to fish growth and large-scale and high-quality fish breeding, but also reduce the fish load in ponds. According to the production practice, the following key technologies should be grasped in catching hot water fish. First, the fishing time is generally chosen in fine weather, cool temperature, fish do not float before and after dawn in the second half of the night, or when the water temperature is low in the morning (the specific time is according to the distance from the market, the time of sale
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