Culture techniques of grass carp Ctenopharyngodon idellus

Grass carp must be no stranger to everyone. In fact, there are many kinds of grass carp, the most common of which are summer grass carp and grass carp spray. Now there are many people who want to raise them, but there are also many skills to be mastered in the process of breeding. if the technology does not pass, there may be some problems with these grass carps.

Culture techniques of Ctenopharyngodon idellus

1. Release of fish fry: the physique of summer flower fry is weak, and the water level of fry pond should be shallow (about 30,000,000 cm). It can put about 100000 fry per mu. The best time to put fish fry is sunny morning, when it is windy, you should put the fry in the wind. Because the summer flowers are weak, transport and release operations should be very careful. When you buy summer flowers from other places and arrive at your destination, soak the plastic bags of summer flowers in the pond for about 20 minutes. When the water temperature in the bag is basically the same as that in the pond, slowly open the plastic bag to the fish fry and put them into the pond.

2. Feeding and management: the fish fry will be fed with soybean milk twice a day within a week, which is 8: 00 am, 3: 00 pm and 4: 00 pm. Grind soybean milk with 2 kilograms of soybeans per mu each time and sprinkle it evenly around the pond. After a week, you can feed soybean powder or peanut cake with appropriate amount of water and then soak and melt. According to the water quality and the amount of plankton in the pond, organic fertilizer can be applied appropriately. At the same time, pay attention to the injection of new water every 5 days, raising the water level by 10 centimeters each time, gradually reaching a water depth of 1 meter, and a transparency of 20 murals and 30 centimeters.

Fish fry culture techniques of grass carp, Ctenopharyngodon idellus

1. Pond disinfection: in the cultivation of grass carp spray, the pond is disinfected from April 20 to 25 every year. Pond disinfection generally maintains a water level of about 30 minutes. Disinfection with quicklime, tea seed cake and so on. If bleach is used for disinfection, the disinfection of ponds and dry ponds can be postponed at the end of April. In order to kill wild miscellaneous fish, pathogens, the next day to add new water, new water injection must be filtered with 60 mesh cloth, so as not to bring enemy organisms.

2. Splash release time: from May 5 to 15 of each year, choose the right time to put spray. Time is too early, the water temperature is too low to affect the survival rate; time is too late, more than 20 days, the water temperature is too high, the water is easy to thicken, easy to suffer from bubble disease, also affect the survival rate.

3, release density: it is appropriate to put 100000 tails of water spray per mu, the survival rate is 30%, and about 30 000 3cm can be cultivated per mu. The stocking density is too high, resulting in insufficient bait, cultivation specifications can not reach, and easy to occur rotifer, resulting in losses.

4. Feeding and management: because the water temperature is suitable in the middle of May, and now the pond water is too fat, it is generally not necessary to apply fertilizer. It is better to have a light water color. When releasing seedlings, there should be smaller rotifers in the water to feed on grass carp spray. If it is a large cladocera, the water spray can not be eaten, and the branch horn can compete with the water spray for food and oxygen, resulting in the failure of water spray cultivation.

Feeding skills of grass carp

Mainly to feed pellet feed, feed protein content of 28% 32%, auxiliary green feed. Feed feeding follows the principle of "pre-coarse and post-refined" and "four fixed and four look". It is generally fed twice a day, and it is appropriate to finish eating within 2 hours and feed 80% of grass carp. After feeding pellet feed continuously for a period of time, the pellet feed should be stopped for one week, and the raw grain feed should be fed at intervals. Usually pay attention to adding appropriate amount of vitamins and other drugs in the feed to avoid a large number of deaths caused by diseases such as hepatobiliary syndrome of grass carp.

Disease control of grass carp

1. White spot disease. Prevention and treatment methods: fish ponds are thoroughly disinfected with quicklime to reduce pathogens. Diseased fish can be soaked in a mixture of 1/50000 copper sulfate and magnesium sulfate plus 1% salt for 20 minutes for 30 minutes to kill all melon seeds.

2. Anchor head disease. Control method: clean the fish pond thoroughly with quicklime to kill the larvae and eggs of Anchor head. Sick fish are strictly prohibited from entering the pond, causing infection. The diseased fish were soaked in potassium permanganate solution of 1/50000 (water temperature 15: 20 ℃) or 1/100000 (water temperature 21: 30 ℃) for 1.5 hours.

In fact, no matter what kind of grass carp, must do a good job of disinfection before breeding, and then reasonable stocking. In the process of breeding, management should be done in place, feeding and disease control should be timely, which also has some skills. There is a detailed introduction above, I hope it can be helpful to all of you.