The autumn fish species are robust and easy to adapt to the cage environment. The growth rate of the fish body is fast and the yield is obviously improved. The overwintering fish in the caisson is about 30% faster than the spring-inoculated fish, and the size of the outbox is about 35% larger. Therefore, it is a good way for fish to grow and produce high yields when the species is going into the box for winter. Its operating technology points are as follows:
First, the box time is generally selected in October when the water temperature reached 15 ~ 18 °C into the box is appropriate, not less than 10 °C, the best choice for fine weather without wind.
2. Disinfection of fingerlings and vaccine injection The disinfection work of the fingerlings before entering the box can be carried out in combination with transportation. That is, the medicine is dissolved in a transport canvas or fish bucket 20 to 30 minutes before the transportation reaches the destination. For bleaching powder 1010-6 or salt water 2%~3%, according to the water temperature flexible grasp, we must accurately calculate the amount of drug administration. Medication time depends on the degree of tolerance of the species. If possible, a grass carp may be used in combination with a grass carp vaccine.
Third, cages prepare fish into the box 7 to 10 days before the complete non-destructive double cage into the water, so that the surface of the cage can be attached to a layer of algae or sediment material, and then put the fish species to reduce the new network Boxes have the opportunity to scrape the fish.
Fourth, into the box management of fish into the box after the water temperature is higher feeding a period of time baits, so that the fish caught in the process of catching and transporting injured parts in time to be restored to reduce the occurrence of fish diseases due to infection. The caisson must be fed before the winter, until the fish species do not eat (water temperature is about 5 ~ 6 °C), to ensure that the body before winter is robust, do not cause premature dehydration caused by weakening the body of the fish.
5. Grasp the caisson and the time to set the cage. The time for the sinking of the cage is appropriate at a water temperature of 4°C. At this time, the water temperature above and below the water body is basically the same. The convection of the upper and lower water bodies ends, and the fish is stable when the physiological state is stable. The changes in the water layer are fractious. When the surface water temperature is higher than 4°C, the water temperature in the upper and lower layers is inconsistent, and convection occurs in the water, which can be lifted from the tank.
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