Breeding and Breeding of Chinese Black Sorghum
Seed cultivation: Umbilicus californica at the beginning of the film production, delicate physique, weak activity, difficult management, domestication in the concrete pool, after about 20 days, up to 3 cm in body, and then moved to the pond for cultivation. The fry can be fed without feeding for the first 4 to 5 days after hatching, and the larvae of the zooplankton need to be fed 4 to 5 days later. At the beginning, it was fed once every 4 hours, after 3 to 4 days, it was changed to 1 day and fed 2 times, and the feeding amount was gradually increased. Zooplankton can be harvested from a net of 100 to 120 meshes, and then filtered using a 40-mesh net. The filtrate is fed to the newly hatched larvae. The filter residue is fed to juveniles, and the fish is allowed to establish regular, fixed-point feedings. When animal feed is insufficient, some egg yolks, soy milk, etc. may be added. From 1 to 7 days after filming, the fish fry has a serious clustering phenomenon and it is easy to make the fry in the cluster plots suffer from lack of oxygen and food inequality. Therefore, when a cluster appears, the water body should be agitated to disperse the fish. During domestication, the bottom of the pool must be cleared of dirt, egg membranes, and dead fish in a timely manner. Change water by 1/3 a day. In the stage of seedlings, the fish body is easily parasitized by aquatic molds and protozoa. Therefore, the fish ponds must be strictly sterilized in advance. In addition, new water must be disinfected in advance. A plastic greenhouse must be erected above the nursery to prevent direct sunlight and heavy rain. During domestication, one or two sub-pools should also be carried out as individuals grow and their relative densities increase to ensure a high survival rate. They can be moved to cages for later cultivation.
Fish breeding: The pond area for breeding fish species should be small, with an area of ​​100-250 square meters. The bottom of the pond should be flat and less silt, and the depth should be 1 meter. Drainage and irrigation should be convenient. About 7 days prior to planting, clear lime ponds used 150 kg per 1/15 ha. Then, 200-400 kg of organic fertilizer is applied per 1/15 hectare. At the time of stocking, 30,000-40,000 fish fry 3 centimeters per 1/15 hectares are released. When fish fry the pond, ensure that the specifications are the same, the operation should be light, and the water temperature difference should not exceed 2°C. It is best to be carried out when there is no wind on sunny days.
At the beginning, there are more zooplankton in the pool but they still need to be supplemented with bait. Every 10,000 fry can be fed 0.5 to 1.0 kg of live zooplankton per day, and the amount of bait is gradually increased as the fish grows. At the same time, a two-meter-long food table should be set up in the pool. The food table should be 20 cm below the water surface so that the bag can be used to feed food. The bag can be filled with stagnant water and fish gills. After about 1 month, when the fish body is more than 6 centimeters long, all fish and compound feeds can be fed, and the proportion of fish gills should be greater than 60%. After that, after 15 to 20 days of breeding, the fish species can grow to about 10 cm.
Because fish fry eat high-nutrient bait, the water quality is easily deteriorated, so it should be replaced every 7 to 10 days and new water to raise the water level, each time you can add 10 to 15 centimeters of water. A special person should be set up to take a look at the pond and take appropriate measures in time according to the activities, feeding and incidence of the fry. If it is found that fish swims along the edge of the pool during the day, it means that there is not enough food, and the amount of feeding should be increased in time. In order to prevent the water quality from being over-fat, a 2000 to 4000-inch white peony slice can be raised in the pond to allow it to feed plankton in the water. After the fishes were pooled, they were splashed with crystals of trichlorfon crystals for a time, so that the concentration of the pool water reached negative 0.36 to kill enemy insects and parasites. During the cultivation process, lime milk (negative power of 3010 in the pool) or bleaching liquid (negative power of 110 in pool water) should be splashed once every other month.
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