First, the quality of seedlings.
Robust, disease-free and injury-free can be used as seedlings. Those trapped with hooks have a low survival rate after stocking, and even if they do not die, they grow very slowly. Therefore, it is generally not suitable for use. When catching the salmon fry, do not use wire hooks to injure the salmon. If purchased in the market, you cannot buy seedlings fed with saccharin or fire soup.
Second, seed specifications,
The seed size is generally suitable for 20-40 tails per kilogram. The seed of this size is neat, its viability is strong, the survival rate after stocking is high, the proliferation is rapid, and the yield is high. If the specifications are too small, the food intake is poor and the weight gain is not fast. Stocking stocks should pay attention to the specifications and size, the size should be as consistent as possible, can not be too disparate, the different specifications of the seed can be divided into pool grading, so as to avoid competing for food and kill each other, affecting the growth and survival rate.
Third, the stocking time
Restocking time is early, and it is better to stockseed the first batch of Astragalus species caught in early spring. After wintering, the scutellaria baicalensis is able to maintain its life only after its wintering. After the spring, it requires a lot of food intake, and it has a large food intake and a wide diet. Therefore, it is necessary to put seedlings as early as possible, to facilitate domestication, to eat early, and to extend the growth period.
Fourth, stocking density
The stocking density varies with the size of the pond, the source of the feed, the seed size, and the feeding and management. Artificially cultivated Astragalus membranaceus, the stocking densities can be slightly larger, with 100-150 pups weighing 25 grams per square metre, ie 2.5-4 kilograms per square metre of young pups. The specifications for stocking are larger and the density can be reduced accordingly. On the contrary, it can be increased accordingly. If there is enough food, you can put more. Home-breeding generally uses 2.5-4 kg per square meter of stocking, and the pond can be stocked with some loach.
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