The technique of using black fish to raise silver carp

1. Cleaning and disinfection of Tangkou

The suitable area of the pond of silver carp with black fish is 6 mu, the area is too small, and the water quality is easy to deteriorate. In summer, the high temperature festival is easy to induce diseases, the area is too large, the production investment is high, and the management is inconvenient. The water depth of the fish pond is about 2 meters, leaving no or less silt at the bottom of the fish pond. it is necessary to remove weeds in the Western Zhou Dynasty of the fish pond, tamp and strengthen the ridge of the fish pond to prevent water seepage and leakage. Clean the pond thoroughly with quicklime 20 days before fish stocking, with a dosage of 100,150kg per mu, and then clear the pond again with bleach (30% available chlorine content) 10 days later, with a dosage of 57kg per mu. A week later, the fish can be released into the water.

II. Release of fish species

The main results are as follows: 1. The stocking time of black fish should be in early October. After entering the pond, the black fish can be fed to restore their physique, and the survival rate of overwintering can be increased, and the survival rate of overwintering can be improved. Before entering the pool, it must be strictly disinfected and prevented. Generally, 3%-5% salt water is soaked for 10-15 minutes and then put into the pool. The best stocking specifications are locally produced fish species, in order to avoid fish injury caused by long-distance transportation, affect the survival rate, and avoid the introduction of pathogenic bacteria from other places.

2. The stocking time of silver carp species and other species can be around the Spring Festival, and it is best to put them into the pond before the Spring Festival. in general, the main black fish ponds are equipped with flowers, 250 silver carp per mu, and 60 common carp and crucian carp. The specification of flower and white silver carp is 680 / kg, and the specification of carp and crucian carp is 1015 / kg. Fish should also be put into the pond after strict disinfection.

III. Feeding and management

1. "four determinations" should be adhered to in feeding. Depending on the size of a pond, 1 or 2 food farms can be set up to concentrate black fish around the food farm, which can form a situation of grabbing food, increase food intake and reduce the waste of bait. The type of feed is mainly freshwater fish, supplemented by marine fish, and the feeding amount of bait fish in peak season is 6% to 8% of fish weight. Wash the small miscellaneous fish before feeding, feed the frozen sea water mixed fish, soak and disinfect them with 3%-5% food solution for 20 minutes after melting, the feeding method is good gradually, and most of the fish can be stopped when they are full. Flower, silver carp, carp and crucian carp no longer need bait.

2. The main purpose of patrolling the pond is to observe the feeding, activities, morbidity and environmental changes of the fish twice a day in the morning and evening, regularly remove the residual bait, remove the excess aquatic plants in the pond, prevent escaping fish, and start the aerator in time if there are signs of floating head.

3. Water quality management high temperature season. The black fish has a large food intake and metabolism, and the water quality is easy to blacken and stink, resulting in a malignant change of the water body, which is not conducive to the growth and development of the black fish, so the high temperature season is usually changed every 3 days and once every 7 days, and where possible, micro-running water culture can be used. The culture water level is maintained at about 2 meters, and the water is changed at other times according to the water quality changes. Generally, the water is changed once a week. If you look at hot weather, you should pay special attention to changing water or adding new water in time.