Culture model of efficient ecological organic grass carp

In spring, the fry has a plague, and in winter, the fry is three points longer. Practice has proved that the Winter Solstice to the Beginning of Spring is the best time to release organic grass carp species, which is beneficial to fish species and environment, facilitate overwintering management, promote the rapid growth of organic grass carp species in spring and increase the yield. The following is an introduction to the culture model of efficient ecological organic grass carp:

Technical points of organic grass carp hoarding:

1. Pond conditions: the pond should be located in a place with sufficient water source, good water quality and convenient land and water transportation. High-density hoarding requires a slightly larger pond area, generally 10 Mel 25 mu, and the water depth should be maintained at 2 Mel 2.5 m, which is convenient for injection and drainage. The pond must be equipped with sufficient oxygenation equipment, and the combination of surface aeration and bottom aeration can achieve better results.

2. Commercial organic grass carp hoarding and release: the pond is cleaned and disinfected for 15 days before stocking. 75 kilograms of quicklime is used per mu and sprinkled with water throughout the pond. About 750kg per mu of commercial grass carp, each time the fish body needs to be soaked in 23% salt water for 5 minutes. When the whole pond of grass carp is purchased and hoarded, it should be sprinkled with external disinfectants such as reclaimed water biquaternary ammonium salt and iodine for one or two times and the concentration of 0.5PPM should be sprinkled to ensure the survival rate of stocking.

3. Feeding and management: organic grass carp are mainly fed with forage, which can be fed appropriately when the temperature rises at the beginning of March. Because wheat straw is abundant from March to June, the feed is fed 2-3 times a day, and the daily feeding amount is 30%-50% of the body weight of grass carp. Eat in 2 hours. After June, the gradual transition to concentrate feed, it is better to feed grass carp full-price compound feed, the daily feed is about 3% of the fish's body weight, eating in 30 minutes. The specific amount of feeding should be increased or decreased according to the weather, water temperature, water quality and feeding situation.

4. Water quality management: due to the large amount of food and excretion of organic grass carp, the pond needs to change water frequently to keep the transparency of the pond above 30cm. The water will be changed every 15 days from March to April, and the amount of water will be changed from 15 to 20cm from May to August. The water will be changed every 10 days from May to August. The amount of 20-40CM will be changed. Biological water improvement drugs such as strong bottom purification will be used while flushing, and 1 kg per mu will be used in high water level ponds. In addition, the aerator should be turned on frequently to keep enough dissolved oxygen in the pool water. In order to hoard grass carp with high density, it is necessary to skillfully master the technology of measuring water and raising fish, use water quality monitoring instruments to monitor water quality regularly, flush, drain and purify water timely according to the situation of water quality, and control the index of harmful substances in water quality within a certain range.