CATDOLL : CATDOLL: Grass carp breeding methods and techniques

Grass carp breeding methods and techniques

1. Environment and pond selection

Grass carp is the most susceptible to disease. To breed pollution-free grass carp, a special breeding base should be established and formed to a certain scale, with no pollution sources around the base. The breeding base should have sufficient water source, good water quality, unobstructed water inlet and outlet, no connection between fish ponds, convenient transportation for fish, rich feed resources, and good ecological environment conditions.

2. Fish species selection

In order to raise grass carp well, you must choose healthy and lively high-quality fish species. The parents of self-bred fish species should come from qualified nationally recognized raw material farms. The seedlings should be bred pollution-free, the quality meets relevant standards, and have excellent breed traits. If conditions permit, it is best to breed them yourself. If fish species are introduced from other places, they must pass quarantine before they can be introduced.

3. Fish disinfection

Fish species must be disinfected before being put in. You can use chlorine dioxide 20-40 mg/L every 5-10 minutes, salt 1%-3% every 5-20 minutes, 8 mg/L every 15-30 minutes, potassium permanganate 10-20 mg/L every 15-30 minutes and other drugs for soaking and disinfection. The stocking ratio is 80:20, that is, the main grass carp accounts for 80%, and the auxiliary fish accounts for 20%.

4. Scientific baiting

Grass carp mainly feed on aquatic plants in natural waters. In pollution-free pond farming, it is appropriate to use granular feed with scientific proportions to reduce the pollution of water quality by residual bait and fully improve the utilization rate of bait. The aquatic and land grasses fed with it should be tender, fresh and palatable. Cakes and other types of bait should be free of mold, pollution and toxicity, and processed by crushing, soaking, cooking and other methods to make it easy for grass carp to eat and digest. Feeding bait should adhere to the principles of timing, positioning, quality and quantity, and the reasonable feeding amount should be determined by observing the weather, water conditions and the amount of food eaten by fish.

5. Feed fishery medicine reasonably

Fishery drugs are substances used to prevent and treat aquatic animal and plant diseases and insect pests. If used improperly, they are very likely to remain in the fish body, causing the fish to be of substandard quality, so they should be used with caution. Fishery drugs generally include fungicides, insecticides, water quality improvers, etc. At present, some traditional fishery drugs have been banned, such as chloramphenicol, furazolidone, sodium pentachlorophenol, malachite green sophora crack, sulfathiazole, tylosin and other 32 fishery drugs, which cannot be used in aquaculture. Special attention should be paid when selecting fishery drugs.

How to raise grass carp?

Feeding is mainly granular feed, with a protein content of 28-32%, supplemented by green feed. Feeding follows the principles of "coarse first and fine later" and "four determinations and four observations". Feed twice a day, and it is best for grass carp to eat it within 2 hours and eat 80% full.

After feeding pellet feed for a period of time, stop feeding pellet feed for 1 week, and feed raw grain feed during the interval. Pay attention to adding vitamins and other drugs in the feed in moderation to avoid grass carp suffering from diseases such as hepatobiliary syndrome and causing mass death;

Water quality management requires the correct use of aerators. From June to October, on sunny and windless days, start the aerator for 2 hours from 1 to 3 pm every day, and add oxygen at the right time in the early morning. If it is cloudy for a long time, add oxygen earlier. Add new water to the pond in a timely manner, and use the method of "small discharge, small inflow, and multiple water changes" to gradually control the water quality.

Additional information:

Ecological habits

Grass carp likes to live in the middle and lower layers of rivers, lakes and other water bodies and nearshore areas with abundant aquatic plants. It has the habit of migrating between rivers and lakes. Sexually mature individuals spawn in rivers, reservoirs and other flowing waters. After spawning, the parents and young fish enter tributaries and lakes connected to rivers.

They feed and fatten in flooded shallow grasslands and flooded areas, as well as in the water bodies of the main and tributary rivers (lakes, streams, harbors and other areas covered with aquatic plants), and hibernate in the deep water of the main stream or lakes in winter.

Grass carp is lively, swims fast, often forages in groups, and is a typical herbivorous fish. It feeds on zooplankton in the fry stage, and insects, earthworms, algae and duckweed in the juvenile stage. When the body length reaches about 10 cm or more, it feeds entirely on aquatic higher plants, especially grass plants.

It is autumn and winter now. If you want to raise grass carp well, it is recommended to do the following:

1. Regulate water quality and improve stress resistance

As dissolved oxygen decreases and water quality deteriorates, aquatic animals are very likely to produce strong stress responses. To address these problems, you may want to use Youjiling to chelate toxins in the water, stabilize the algae, and repair poor water conditions. In addition, Youjiling can also reduce the stress responses of aquatic animals caused by changes in the external environment, reduce energy consumption, and improve the body's adaptability.

2. Supplement nutrition and enhance physical fitness

It is very important to enhance the immunity of aquatic animals by supplementing nutrition and energy in order to cope with the La Nina phenomenon. Many farmers now mix Stalin into feed, which can not only improve intestinal health and regulate intestinal immunity, but also protect the liver and gallbladder and promote digestion and absorption. In addition, Stalin also plays a positive role in attracting food and promoting growth.

3. Strengthen fish pond management

It is recommended to increase the water storage capacity of fish ponds to keep the water level above 1.8 meters as much as possible. When conditions permit, dig wells to extract groundwater, use hot spring water and cave groundwater, or build heat preservation sheds and windbreaks; add oxygen enrichment equipment to ensure sufficient dissolved oxygen.

4. Inspection and maintenance of related facilities

Keep the fish pond embankment strong and intact without leakage, strengthen facility management, such as checking and clearing the attachments of inlets and outlets, screens, cages, meshes, etc., to keep the water flowing smoothly; promptly inspect and maintain ponds, breeding facilities, power facilities, water inlet and outlet channels, etc., protect exposed water pipes and gate valves with straw ropes, and replace damaged facilities in time; for newly renovated fish ponds and breeding facilities, special maintenance should be carried out for slope protection and water inlet and outlet facilities; check insulation equipment, replenish the fuel needed for heating, and ensure the normal operation of the greenhouse.

5. Make good preparations for relevant material reserves

Make good preparations for material reserves during low temperature, rain and snow weather, prepare the supply of generators, aerators, water pumps, animal protection/fishery medicines and other materials in advance, check at any time whether everything is normal, strengthen the scheduling of emergency material reserves, and keep abreast of the emergency material reserve situation to ensure that they can be in place in time and sufficient supply in an emergency.