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:
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 type cage, usually 7 meters long, 4 meters wide and 2 meters high. The size of the mesh should be compatible with the size of the stocked fish species. If the stocking size is 10 to 14 centimeters, fish should be used. The mesh is 2.3 to 3 cm. When the cage is placed in the 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 under the water for 10 to 20 centimeters for feeding and management; in the north due to a long freezing period, the cover should be under ice 1 At a depth of ~ 2 meters, a depth of 1 m or more is required 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 to 5 kilograms of fish can be maintained for 10 to 14 centimeters per cubic meter of cage water, and 6 to 7.5 kilograms for places with short icing periods.
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 23 days of the box, it is necessary to stop feeding the overwintering fingerlings. 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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