Autumn and winter bred broodstock attention

Autumn and winter bred broodstock attention

Autumn and winter season is the early stage of gonad development in the broodstock. The quality of the gonads in this period not only affects the amount of brooding eggs, but also determines the success or failure of broodstock breeding in the spring of the following year. Therefore, in the fall and winter season, we must focus on nurturing broodstock. The measures are as follows:
First, to strengthen the broodstock cultivation The water temperature in the fall gradually decreases, the source of green feed decreases, and the appetite of fish decreases. Therefore, it is necessary to cultivate water quality. Fertilizer has the following advantages: It can cultivate plankton for salmon and squid for its growth; The photosynthesis of abundant phytoplankton can increase the amount of dissolved oxygen in the water for the survival of fish breathing; . In general, 500 kilograms of manure and livestock manure water has been fermented in Mushi; after the winter, the temperature has decreased and the principle of “more time and more supplements” has been followed. Through fertilization, the scorpion fish and scorpionfish have enough nutrients in their bodies to ensure the normal development of broodstock after spring. Second, carefully feeding, fattening and strengthening. In addition to breeding mandarin fish and carp, in addition to fertilizing water and breeding abundant plankton to feed the fish, it is also necessary to feed powdered bran for its intake to enhance its health; grass carp is fed at 8-9 am Green fodder, 2% of concentrate feed (peanut bran, bean cakes, etc.) is added in the afternoon to ensure growth and fattening; after chilly days in autumn, 1%-2% of the sperm is fed every 2-3 days at high water temperature at noon. Feed to compensate for physical energy consumption. If it is a bottom-level fish such as cockroach, cockroach, squid, etc., 3%-4% of concentrated feed should be fed every fall to allow it to eat full and strong; after winter, it is also fed once every 1-2 days. To make it safe for the winter.

Second, regulating water quality Maintaining fresh water is one of the effective measures to promote gonad development and maturation. Recruiting fresh water depends on the season, temperature, water quality, and broodstock feeding. The southern part of the country is still hot in autumn, and it is usually added once a day for 7-10 days. In winter, water is added for 15-20 days, each time adding 20-30 centimeters of water. In addition to deepening the water level, in addition to increasing oxygen, there is also insulation. Eel and squid can be properly reduced to add water to maintain the pool water.

Third, the prevention of fish disease Broodstock before crossing the pond, the first pro-fish pond silt removal of miscellaneous, water clear pond disinfection, fertilization water quality; and then use 3% -4% saline solution dip the fish for 20 minutes off the table. Appropriately deepen the 2-3 meter water level after entering the winter to slow down the water temperature and prevent icing and oxygen deficiency. The food field is disinfected once every two weeks, and the residual bait debris is often removed; the pond is disinfected once a month, and 40 mu of quicklime can be sprinkled with water per mu, or 2 mu of bleached water can be used for the mu/meter water depth; With fish Bi Kang, Jie Jie and other drugs mixed feed 1-2 days, enhance the body's function, improve disease resistance. All in all, prevention is essential, disease-free prevention, disease treatment, prevention and control are combined.

Fourth, do the cold winter work during the winter, in addition to do a good job in water quality management, feed feeding, fish disease prevention and control, under normal circumstances do not pull the net fishing, so as not to damage the surface of fish infected with hydropodium. As long as the water level is deep enough (2 . 5 -3 m), the four homes are safe for the winter. However, some tropical and subtropical fishes such as earthworms, batai, freshwater whitefish, earthworm ponds, Egyptian pond catfish, and tilapia, etc., suffer from frostbite if the water temperature is lower than 10°C, and will fall below 7°C. A large number of frozen dead. Therefore, to strengthen cold work, it is recommended to take 50-60 m2 of anti-moisture sheds in the deep water of ponds in the leeward sunny area. You can use the bamboo rods to clamp the 3-4 inches thick off the water surface of 20-30 cm. On the other hand, it can effectively prevent the frost from being hit by cold winds. It is also possible to put turf mud, mowing straw and the like in advance around the base of the pond, pay attention to the weather broadcast, and instantly ignite the turf and smoke from the cold wave. Heavy smoke forms in the space above the pond. A warm air flow dissolves frost-cooled air, which is also effective for protecting tropical and subtropical fish during winter.

Next Article
Prev Article