What grass do fish generally like to eat? How many pounds can you gain in a year?

Grass carp is a typical herbivorous fish. Grass carp weighing more than 2.5 kg can eat 120 to 180 grams of grass every day. So, what kind of grass does grass carp like to eat? How many jin can you gain in a year? What are the feeding methods? Next, let's learn about it together.

What kind of grass does grass carp like to eat?

Grass carp eat a lot of food, but not all grass likes it. In addition to eating duckweed and aquatic plants, I also like eating morning grass. According to the experiment, for every 0.5 kg weight gain, grass carp need to eat 45 kg of aquatic plants or 20 kg of early grass. Grass carp have a certain choice for early grass. The grass with reticular veins (cluster leaves) is not as fond of eating as flat veins (long leaves). Whether it is early grass or aquatic plants, it is better to be tender, because the tender grass has more protein and less cellulose, and the fish is easy to digest and use.

How many jin can grass carp gain in a year?

Grass carp grows rapidly. As far as the whole growth process is concerned, the fastest growth period of body length is 1-2 years old, and the fastest growth of body weight is 2-3 years old. When the 4-year-old fish reached sexual maturity, the growth slowed down significantly. The body length of winter-aged fish is about 340mm and its weight is about 750g; the length of winter-age fish is about 600mm and its weight is 3.5kg; the length of winter-age fish is about 680mm and its weight is about 5kg; the length of winter-age fish is about 740mm and its weight is about 7kg; the body weight of five-year-old fish is about 780mm and its weight is about 7.5kg; the largest individual can reach about 40kg.

What are the feeding methods?

1. Feed more fresh and tender forage. Fresh and tender forage is rich in nutrition and less cellulose, grass carp like to eat, easy to digest, can make grass carp grow faster and less sick, can reduce feeding, reduce culture costs and improve economic benefits. Therefore, fresh green forage should be selected as far as possible when feeding grass carp. The forage should be long-leaf green grass with flat veins. It is not suitable to feed grass carp anorexic net-veined pellet forage. It is better to feed ryegrass, Sudan grass and wild long-leaf tender grass.

two。 Reduce the feeding of aquatic plants. According to the experiment, grass carp eat terrestrial plants, eat less and gain more weight, while eat more aquatic plants and not gain much weight. However, when the source of terrestrial plants is insufficient, water plants can be fed less.

3. Feed different fodder according to the size of the fish mouth. Grass carp in the juvenile period, the mouth is small, can not feed thick, hard forage, it is appropriate to feed sedge, duckweed and so on. Or the fresh and tender long-leaf grass can be chopped up and fed, and then as the fish grow up, they can transition to conventional forage.

4. 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 eat well and evenly, so as to improve the effect of breeding, and adjust the feeding amount according to the weather, water quality and fish activities. adapt to the requirements of fish for grass. It is strictly forbidden to feed forage that has been stored for too long and moldy, so as to prevent fish from becoming infected with disease.

Culture techniques of grass carp

1. 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. Each 10 mu pond is equipped with an aerator with a power of 3 kilowatts and an automatic baiting machine.

two。 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 of quicklime per mu.

3. 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 in 5% salt water for 5 minutes for 10 minutes before stocking.

4. 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 in the feed to avoid a large number of deaths caused by diseases such as hepatobiliary syndrome of grass carp.

5. 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 3-5 days, about 10 cm each time, and sprinkle it with 10-20 kg quicklime in the whole pool every 15-20 days.

6. 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. Oral administration with "Sanhuang powder" bait is better, every 50 kg of fish reuse Sanhuang powder (50% of rhubarb, 30% of Phellodendron Phellodendri, 20% of Scutellaria bait, ground into crushed powder and stir well) 0.3 kg of flour paste is mixed into the feed for 3 days.

7. 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.

Nutritional value of grass carp

1. Grass carp is rich in unsaturated fatty acids, which is good for blood circulation and is a good food for cardiovascular patients.

two。 Grass carp is rich in selenium, often eaten has the effect of anti-aging, beauty, but also has a certain role in the prevention and treatment of tumor.

3. For people who are thin and have no appetite, grass carp is tender but not greasy and can be appetizing and nourishing.