How many kinds of grass carp are there? How to breed scientifically?

Grass carp (Ctenopharyngodon idellus) is one of the four domestic fish cultured in freshwater in China. It is an endemic fish from Guangxi to Heilongjiang and other plain areas in eastern China. So how many kinds of grass carp are there? How to breed scientifically? Let's learn about it together:

How many kinds of grass carp are there?

Grass carp belongs to the genus Ctenopharyngodon idellus of the subfamily Cyprinidae. Grass carp are commonly known as: mackerel, oyster, grass carp, white carp, grass carp, grass root (northeast), thick seed fish (Lunan), sea fish (south), mixed son, black herring and so on. Sexually active, swimming fast, often looking for food in groups, is a typical herbivorous fish. Grass carp eat larvae, algae and so on when they are young. Grass carp also eat some meat, such as earthworms and dragonflies.

The main species of grass carp in aquaculture in China are generally divided into three strains: Yangtze River system, Pearl River system and Heilongjiang River system. The new varieties are golden grass carp, crispy meat carp and abalone meat carp.

How to breed scientifically?

1. Environment and pond selection

Grass carp is the most likely to get sick, pollution-free grass carp should have a special breeding base, and form a certain scale, there is no pollution source around the base. The aquaculture base should have sufficient water source, good water quality, smooth drainage, no communication between fish ponds, convenient transportation of fish, rich feed resources and good ecological environment.

two。 Fish species selection

In order to raise grass carp well, healthy and lively high-quality fish species must be selected. the parents of self-propagated and self-bred fish species should come from raw material farms recognized by qualified countries, and the seedlings should be cultivated without pollution, with quality in line with relevant standards and good characters of varieties. The best conditions for self-propagation and self-breeding are good. For example, the introduction of fish species from other places must be quarantined before they can be introduced.

3. Fish seed disinfection

The fish should be disinfected before being put in. Chlorine dioxide can be used to soak and disinfect the fish with 20 milligrams / liter of chlorine dioxide every 10 minutes, 1 percent of salt every 20 minutes, 8 milligrams / liter of potassium permanganate and 20 milligrams / liter of potassium permanganate every 15 minutes and 30 minutes. The stocking proportion is 80% according to the 80 ∶ 20 stocking mode, that is, 80% of grass carp and 20% of fish.

4. Scientific bait

Grass carp mainly feed on aquatic plants in natural waters, and in pollution-free culture in ponds, it is suitable to use pellet feed with scientific ratio to reduce the pollution of residual bait to water quality and fully improve the utilization rate of bait. It should be tender, fresh and palatable with fed water drought grass. Cakes and other kinds of bait should be mildew-free, pollution-free and non-toxic, and after crushing, soaking and cooking, grass carp can be made into bait that is easy to eat and digest. Feeding should adhere to the principles of timing, positioning, qualitative and quantitative feeding, and the reasonable feeding amount should be determined by observing the weather, water conditions and the food intake of fish.

5. Rational feeding of fishery medicine

Fishery medicine is a substance used to prevent and treat aquatic animal and plant diseases and insect pests. If it is not used properly, it is easy to remain in the fish, resulting in unqualified fish quality, so it should be used with caution. Fishery medicines generally include fungicides, insecticides, water quality improvers, etc. At present, some traditional fishery medicines have been banned, such as chloramphenicol, furazolidone, pentachlorophenol sodium, malachite green, sulfathiazole, tylosin and so on. It can not be used in aquaculture, and special attention should be paid to the selection of fishery drugs.

Nutrition analysis

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, which not only has the effect of anti-aging and beauty, but also has a certain effect on 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.