Culture techniques of grass carp and attention to grass feeding

Grass carp (Ctenopharyngodon idellus) is loved by consumers because of its delicate meat, large size and few intermuscular spines. Next, let's take a look at the culture techniques of grass carp and the attention to grass feeding.

Culture techniques of grass carp

Pond requirements: the pond area is 10 to 20 mu, the water depth is 2 to 2.5 meters, and the silt thickness is not more than 20 centimeters. One aerator and one automatic bait machine with a power of 3 kilowatts per 10 mu pond.

Pond cleaning: drain the pond water in winter and freeze for more than 20 days. 15 days before stocking, the water was 10cm to 20cm, and the pond was disinfected with 150 kg quicklime per mu.

Fish stocking: before and after the Spring Festival, 300 grass carp fingerlings of 200kg / mu, 300 crucian carp fingerling of 150g / kg, 50 silver carp fingerling and 10 bighead carp fingerling were released. Soak the fish fry in 5% salt water for 5 minutes before stocking for 10 minutes.

Feed feeding: 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 to the feed to avoid a large number of deaths caused by diseases such as hepatobiliary syndrome of grass carp.

Water quality management: correct use of aerator, sunny and windless weather from June to October, turn on oxygen for 2 hours at 1: 3 pm every day, timely increase oxygen in the early morning, and increase oxygen in advance on continuous cloudy days. Add new water to the pond at the right time, and adopt the method of "small row and small advance, changing water many times" to gradually control the water quality. From June to September, add fresh water once every 3 to 5 days, about 10 cm each time, and sprinkle 1 meter of water depth per mu of water every 15 to 20 days with 10 kilograms of quicklime in the whole pool.

Disease prevention and treatment: the way of "the combination of coarse before and after fine, fine green" was used to control the occurrence of grass carp hepatobiliary syndrome. The common diseases of grass carp are red skin disease, Gill rot disease and enteritis, which are generally treated with the combination of internal and external treatment, mainly with disinfectants such as bleach and chlorine dioxide for 3 days. The effect of "Sanhuang powder" bait for internal administration is better. For every 50 kg of fish, reuse Sanhuang powder (50% of rhubarb, 30% of Cortex Phellodendri, 20% of Scutellaria baicalensis) 0.3 kg of rhubarb powder mixed with flour paste and mixed into feed for 3 days for 5 days.

Timely fishing: timely listing of large adult fish is an important measure for high-yield grass carp culture. the main purpose is to reduce the fish carrying capacity of pond water and promote the rapid growth of pond fish in the later stage. It is usually caught once at the end of July and when the water temperature is low in the early morning.

Attention to grass feeding of grass carp

Grass carp (Ctenopharyngodon idellus) eat grass since the juvenile fish grow 5 centimeters long. Grass carps weighing more than 250 grams can eat up to 125 to 180 grams per day. Therefore, when using forage to feed grass carp, it is necessary to do a good job in the following four levels:

1. Reduce the feeding of aquatic plants

According to the experimental observation, grass carp can gain 1 kilogram of meat by eating 15 kilograms of terrestrial aquatic plants, while eating 60-80 kilograms of aquatic plants can gain 1 kilogram of meat. Therefore, in the case of sufficient sources of terrestrial aquatic plants, they can be fed less or not.

2. Feed more fresh and tender forage

Fresh and tender forage is rich in nutrition, less cellulose and easy to be digested. Grass carp eating fresh and tender forage can not only make grass carp grow faster, reduce disease, but also reduce feeding, reduce breeding costs and improve economic benefits. Therefore, fresh and tender forage should be used as far as possible when feeding grass carp. The type of forage should be long-leaf green grass with parallel veins and should not be fed with reticular veins of grass carp anorexia. It is better to feed the forage grass such as ryegrass and Sudan grass and the young grass with wild growth leaves collected. Usually, but also to observe the grass carp eating grass, grass carp like to eat grass should be fed more to meet the needs of grass carp growth and development.

3. The feeding method should be appropriate.

Grass carp should be fed regularly, sufficiently and evenly every day, and strive to spread the forage so that the fish can have enough to eat. The amount of feed should be adjusted according to the weather, water quality and fish activities. It is strictly forbidden to feed grass carp that have been stored for too long and moldy to prevent grass carp from becoming infected with disease.

4. Feed different fodder according to the caliber of fish.

Grass carp in the juvenile stage of small caliber, can not be fed with thick, hard forage, it is appropriate to feed small duckweed, sedge and other forage, or will be fresh and tender long-leaf grass crushed and fed. After that, with the increase of fish age, the caliber increases gradually, and it can be transferred to feeding conventional fresh forage.