Feed formula of silver carp cultured with silver carp

Silver carp, I think, is quite common in daily life, and we often eat it. As China's aquaculture industry has been developing very well in recent years, especially in fish culture, the threshold for fish culture is relatively low and the investment cost is relatively low. It is very suitable for farming in rural areas.

Feed formula of silver carp cultured with silver carp

Formula feed is a powdered or granular feed made by mixing a variety of feed according to the nutritional needs of fish according to a certain formula. Vitamins and trace element additives are used in the formula, which is called full-price formula feed. Compound feed can play the role of nutritional complementarity of all kinds of feed, better meet the nutritional needs of fish growth and development, promote fish growth and save feed resources. Practice has proved that silver carp can adapt to compound feed very well, and feeding silver carp with compound feed can generally achieve good results, so the use of compound feed should be popularized as far as possible.

1. Nutritional requirements of silver carp: silver carp culture has a long history in China. Traditional culture mainly uses fertilization to cultivate plankton as the feed of silver carp, and compound feed has been used in recent years, but there is still a lack of sufficient research on the nutritional requirements of silver carp.

2. Formula of compound feed for silver carp: because silver carp can obtain a certain amount of natural bait in the water area, its nutrition does not come entirely from artificial feed, and the requirement of full price of feed is low. In the absence of sufficient research on the nutritional requirements of silver carp, the formula of compound feed for silver carp is uncertain.

The practice shows that in the waters where silver carp are mainly cultured, a good culture effect can be obtained by using the feed formula of grass carp to produce compound feed for silver carp. In the waters where silver carp is mainly cultured, the effect of pond mixed culture fish feed produced by feed factory is also good.

Living habits of silver carp

1. Feeding habits: silver carp belongs to pelagic fish, which feeds on plankton all its life. It mainly eats zooplankton in the fry stage, and gradually changes to phytoplankton when it is more than 1.5 cm long, and likes to eat grass carp feces and chicken and cow dung. I am interested in sour food and have an appetite for bad food. Bait has obvious seasonality, in addition to plankton, but also eat a large number of sapropelic bait in Spring and Autumn. The lower the water level in summer, the greater its food intake, and it eats less and moves less in winter.

2. Water temperature: silver carp likes high temperature, and the most suitable water temperature is 2332 ℃. Silver carp have the strongest appetite in hot summer. Lively temperament, like to jump, have the habit of going against the current, but the action is not very agile, more clumsy. Silver carp like fertilizer and water, and individual imitators often gather and swim to the middle and upper layers of the water, especially in the open water area where the water quality is fatter. Timid fear of disturbance, the ability to withstand hypoxia is very poor, hypoxia in the water immediately floating head, some die soon.

3. Reproduction: silver carp has fast growth rate and high yield. The age of sexual maturity of silver carp is 1-2 years earlier than that of grass carp, and the mature individuals are also smaller. Generally, the female fish weighing more than 3 kg can reach maturity, and the relative number of eggs laid by the female fish about 5 kg is about 40-50 000 eggs / kg body weight. Under the condition of pond culture, if there is enough bait, the fish can grow to 500 kilograms in that year, the weight of three-year-old fish can reach 3 kilograms, and the weight of three-year-old fish can reach 30 kilograms in natural rivers.

Culture techniques of silver carp

1. Selection and retention of parent fish: parent fish choose natural species, which requires good health and good gonadal development. The individual weight of silver carp is more than 6 kg, bighead carp more than 10 kg, herring more than 15 kg, grass carp more than 8 kg. The annual renewal rate of parent fish should be about 10%.

2, clean up the fish pond: the parent fish pond should be convenient for irrigation and drainage, silver carp and bighead carp pond bottom should have 20 cm deep silt, green carp and grass carp pond bottom should contain little or no silt. The area is 1 to 5 mu and the water depth is about 1.5 meters. The pond should be cleared before stocking.

3. Matching stocking: the female-to-male ratio of silver carp, bighead carp, green fish and grass parent fish is generally 1: 1: 1.5, and at the same time 810 mandarin fish and 150 tail silver carp are released per mu to control the breeding of wild miscellaneous fish and large zooplankton.

4. Feeding and management: before stocking, the parent ponds of silver carp and bighead carp should put 500,700 kilograms of mature organic fertilizer per mu to cultivate plankton, and proper fertilization should be applied in the future. In addition, soy cake milk should be fed in sunny and warm weather to promote gonadal development.

5. Early induction of labor: female fish can be induced to give birth with dilated abdomen and loose reproductive pores. Generally, female fish are injected with 1000 IU of oxytocin chorionic gonadotropin per kilogram of body weight, or LRH~A40~50 micrograms, and males are reduced by half.

6. Incubation management: the water for hatching should be filtered with a filter to prevent floating objects and wild miscellaneous fish from entering. Before each hatching, the incubator tank and incubator should be cleaned, the appropriate water flow should be provided during the incubation period, and the bottom corner of the water body should be turned frequently to check whether there are accumulated eggs and seedlings to maintain the water quality.

What kind of food does silver carp eat

The main results are as follows: 1. silver carp is a typical filter-feeding fish. it filters out the plankton in the water by the special structure of the gills, feeds on plankton for life, mainly eats zooplankton at the fry stage, and gradually changes to phytoplankton when it is more than 1.5 centimeters long. and like to eat grass carp feces and put chicken, cow dung, also eat soybean milk, bean dregs powder, wheat bran and rice bran, more like to eat artificial microparticle compound feed.

2. Silver carp are interested in sour food and have an appetite for bad food. Silver carp like to eat rotten food, often with grass carp to feed silver carp to eat grass carp feces, so there is a grass to raise three silver carp.

3. The diet of silver carp has obvious seasonality. In spring and autumn, in addition to plankton, a large number of spoiled baits are eaten. The lower the water level in summer, the greater the food intake, and eat less in winter.

From the above analysis, we know that the primary task of silver carp culture is the feed formula, the use of reasonable feed can greatly increase the fish production and shorten its culture cycle, but the feed is not blindly fed, should be based on the principle of cost saving, proper feeding.