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1. The location of cages placed in cages should be located in the waters of the Bay, which is sheltered from the wind, has a fresh water, high dissolved oxygen, no industrial pollution, and no organic wastewater flows into the water. The water surface should be spacious, the water bottom should be flat, and the water depth should be more than 3 meters. And the water level does not fluctuate, 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.
Second, the density of the overwintering species in cages maintained by a density cage differs depending on the length of the water surface 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.
3. The time for keeping and boxing in the box is in the late autumn and early winter. The water temperature is 10°C, and it is carried out in sunny and warm 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.
Fourth, to 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.
V. Timely delivery from the box to the second spring, when the water temperature rises above 10°C, the fish species in the box can be sold.
Net cages for raising wintering species
Using cages to feed overwintering fish species is a good way for wintering fish species. Its main technologies are: