Using cages to feed overwintering fish species is a good way for wintering fish species. Its main technologies are:
The cage should be set in the place where the cage is placed. It should be located in the bay area where the sheltered wind is sunny, the water is fresh, the dissolved oxygen is high, there is no industrial pollution and the organic wastewater flows in. The water surface should be spacious, the water bottom should be flat, the water depth should be more than 3 meters, and the water level should be Fluctuations are not so great, it is best to have micro-flowing water. The cage should use a six-side sinking cage, which is generally 7 meters long, 4 meters wide, and 2 meters high. The mesh size should be compatible with the size of the stocked species, if the stocking size is 10 cm to 14 cm Fish species have a mesh size of 2.3 cm to 3 cm. When the cage is placed in water, the water temperature in the south is more than 0°C in winter, and the cover can be flattened on the surface of the water or 10 cm to 20 cm below the water for feeding and management; in the north, due to the long freezing period, the cover should be under the ice. From 1m to 2m, there is a depth of more than 1m between the cage and the ice to ensure that there is sufficient dissolved oxygen in the water in the cage.
The density of overwintering species for raising wintering species in cages varies with the length of the icing period. In areas where the icing period is long, 3 kg to 5 kg of fish can be kept in sizes of 10 cm to 14 cm per cubic meter of water. In places where the icing period is short, they can increase to 6 kg to 7.5 kg.
The time for keeping the boxes together and boxes is in the late autumn and early winter, and the water temperature is 10°C. It is conducted in sunny, warm and windy weather. In the first two to three days of the box, it is necessary to stop feeding the overwintering species. When combining boxes, fish species cultivated by different methods should be counted in boxes and sub-species. For fish species cultivated in fishponds, they must be disinfected and the injured should be singled out. The fish species raised in the same box require the same variety and the specifications are neat. After each box of fish is put in place, close the lid.
Strengthen management to regularly check the activities of fish species in cages, do a good job of preventing fleeing and preventing damage, and find that fish diseases should be promptly treated. During freezing on the surface of the water, when the amount of dissolved oxygen in the water around the cage is less than 3 mg per liter, it is necessary to perforate and supplement oxygen on the ice. The water temperature in the southern winter is not very low. In the sunny days, the fish will feed and feed some concentrated feed properly to increase the out-of-the-box rate of overwintering fish species. Always clean the mesh and keep the mesh open.
When the temperature of the water rises above 10°C, the number of fish species in the box can be sold.
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