First, the preparation before stocking According to the conventional pond disinfection method clear pond disinfection, that is, about 20 days before stocking the pool water drained, remove the mud at the bottom of the pool to keep the mud below 30 cm, continuous exposure for several days, until the sun Cracked, clear debris at the bottom of the pond. The mu was then disinfected with quick-moistened 75 to 100 kg of quick-drying water to kill pathogens and predators. It can also be disinfected with 30 g/m3 bleach (32% available chlorine).
60 to 60 days before stocking, filter the water on the 60th day to prevent the wild fish from entering the pond, and keep the water depth of 50 to 80 cm. Place the fermented and decomposed pig manure, cow dung, or chicken manure on the sunny side of the fish pond. Organic fertilizers (300 to 500 kg per acre) are used to cultivate plankton, ensuring a rich and palatable natural biofeed after the fish ponds.
Second, the stocking stocking stocking density according to pond conditions, stocking species specifications and the breeder's breeding techniques. Generally, 1200 to 1800 tails of summer fishes are stocked per acre. At the same time, according to the different habitats of the main species, appropriate combinations of some traditional fishes such as cockroaches, clams, grass carp, clams, cockroaches, cockroaches, etc. can be used to maximize the use of water bodies. Get higher economic benefits. Fish species before stocking, such as the concentration of 3% to 5% of the salt water, or per cubic meter of water containing potassium permanganate 10 to 20 grams of liquid bath sterilized after 5 to 10 minutes before the next pond.
There are many breeds of freshwater fish and there is no fixed specific stocking mode. In order to make full use of water resources and achieve greater economic benefits, the current stocking modes adopted include polyculture and nesting.
The conventional farming stocking modes in the northern regions mainly include:
1 In order to raise the main species of squid, 3,000 to 4,000 pieces of high-quality summer squid seedlings can be placed in the mu, and 200 to 400 pieces of summer flowers and 400 to 800 pieces of summer flowers can be used together with 700 to 900 pieces of summer grass carp. Summer 400 to 600, the conditions can also be raised Wuxi, squid, or southern large mouth maggot 20 to 50 and so on.
2 With grass carp as the main cultivar, acre puts 3,000 to 4,000 fine summer carp seedlings, which can be matched with 200 to 400 summer flowers, summer flowers and 600 to 800 white pheasants, and 400 to 600 summer squid flowers. The conditions can also be cultivated with black squid, squid, or the southern bigmouth licking of 20 to 50 tails. If the squid is to be raised, its size should be smaller than grass carp;
3 In order to raise the main species of squid, 4,000 to 5,000 pieces of high-quality summer fry were put in the mu, and 200 to 400 pieces of summer flowers and 400 to 800 pieces of summer flowers in summer and 150 to 200 flowers of summer in Wuchang can be paired with stocking flowers. In the South China Sea, with 20 to 30 tails, it is not advisable to choose fish with strong feeding habits such as carp and grass carp.
The stocking mode in most parts of Central and South China is mainly fish farming, mainly including:
1 In order to breed mainly pupa and pupa, the proportion of main fish rearing accounts for 75% to 90% of the expected total output of various turtle seedlings. The proportion of white locust should be higher, and the stocking ratio should be about 10% of grass carp. , squid 5%;
2 High-density polyculture based on concentrate feeds, including polyculture of carp, grass carp, herring, carp, carp, and stingray;é²¢18%?20%, é³™3%?5%, grass carp 8%?10%, herring 3%?5%, carp 20%~25%, carp 20% to 25%, stingray 12% to 15 %;
(3) Stocking patterns of common fish such as cockroaches, clams, grass carp, and squid, and raising stocks of precious fish such as small eels, the stocking rate of conventional turtles is roughly 70% to 85%, and then the appropriate number of cod , stingray, squid and other valuable fish.
Third, the bait feed fish ponds after the pond in addition to the rich plankton in the water for food, but also feed a small amount of food or splash soy milk and other supplements. At the beginning of stocking, they were fed with carp or soybean meal. After 12 to 20 days, they could be fed normally, and they were fed with seed pellet feed (crude protein about 25% to 30%), and later changed to adulterated pellet feed (crude protein). About 20% to 25%).
Feeding adheres to the principle of "Four Sets", timing (such as 8:00 am in the morning, 3-4 pm in the afternoon, and can be postponed appropriately in high temperatures in summer and autumn), fixed point (fixed on the bait station, assuming 2 sets per pool). 4 food sets), quality (to ensure high-quality feed, no spoilage, etc.) and quantitative (daily feeding amount is about 20% to 50% of fish body weight).
Fourth, the daily management of fish ponds, the water quality requirements "fat, live, tender, cool", water quality regulation and management is the key. If the transparency of the water body is more than 30 μm, it means that the water body is too thin. Appropriate fertilizer must be applied. Fermented livestock manure can be used. If the water body is less than 20 cm, the water quality is too fat. Pay attention to adding new water or appropriate amount of water. water. The improvement and regulation of water quality, such as using quicklime, EM bacteria or sediment modifier, etc., every 15 to 20 days, the use of quicklime 10 to 15 kilograms of water Quanchiposa, in order to adjust the pH of the aquaculture water, improve the buffer of the water body The performance provides a good environment for the rapid growth of fingerlings.
After 1 week of fish species in the pond, Povidone iodine or 90% crystal trichlorfon can be used to sterilize the water. The water can be used once a day for three times in a row to achieve better fish disease prevention. In addition, improving the disease resistance of fish itself is also one of the measures to effectively prevent fish diseases. For example, oral vitamin C and multivitamin for aquatic products can also be regularly fed with 1% salt or 0.1% fresh garlic juice.

Food additives

The food additives has many kinds with huge quantities, It has been reached more than 2,000 varieties currently, which is widely used in the food manufacturing industry, The synthetic or natural substance can improve food quality and color, smell and taste as well as the need for preservation, preservation and processing technology. Each country has stringent control on the use of food additives, consumers are also mere mention of the food additive, the experts reminded that consumers needs not too worry about the food additives , during food processing,if not used food additives,it will take more risks, because the deterioration will cause food poisoning disease. Preservative is a kind of food additives which can appropriate prevent food spoilage, kill the toxigenic microorganisms caused by Aspergillus element, it is beneficial to human health. Food additives have a kind named as nutritional supplements, it can greatly improve the nutritional value of food, which has significantly positive on preventing malnutrition and nutritional deficiencies, and promoting nutritional balance. Phthalide is one of the food additive which we carefully focused on development, our annual production capacity is over 300 tons. products are sold to the US market nearby five years, the quality has been widely recognized.

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