Fry price and culture method of silver carp

Silver carp is a large freshwater fish raised artificially, and it is one of the main freshwater fishes in China, also known as silver carp, etc., distributed in major river systems throughout the country, with the characteristics of rapid growth, less disease, high yield and so on. However, in actual production, silver carp are mostly mixed with grass carp and carp. Let's take a look at the price and culture methods of silver carp fry.

How much is a silver carp fry?

The market price of silver carp fry is mainly determined by the variety, specification and purchase quantity, which is generally about 0.02-0.5 yuan per fry. Silver carp is a typical filter-feeding fish, which mainly eats zooplankton at the fry stage, and gradually changes to phytoplankton when it is more than 1.5 centimeters long. it also eats soybean milk, bean dregs powder, wheat bran and rice bran, and prefers to eat artificial micro-particle compound feed, which is suitable for culture in fertilizer and water. Silver carp is a kind of captive fish in culture, which is in a subordinate position in the pond where carp, crucian carp, grass carp and blunt snout bream are mainly raised.

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, females of more than 3 kg can reach maturity, and the relative number of eggs laid by females of about 5 kg is about 40-50 000 eggs / kg body weight. They lay eggs from April to May every year, and the eggs float. 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.