Wintering management techniques for fingerlings

In order to ensure safe wintering of the fingerlings and improve the survival rate of the fingerlings, wintering management of the fingerlings becomes an important link in fishery production.

One, before wintering

1, the choice of wintering pool. The wintering pond is best chosen in a relatively quiet place, with an area of ​​2-4 mu, and ample water. The sediment is about 20 centimeters deep and the water depth is about 2 meters. In the first two months after the fish is released, the pool water is allowed to dry. After 3-5 days of drying, 50-75 kilograms of lime are used per acre to transfer water into the slurry.

2. Intensive cultivation of overwintering species. After the fall, we must feed more palatability-enriched protein- and fat-rich concentrates to increase the fish's fatness and enable it to survive winters. In general, overwintering fish species require specification of more than 10 cm, otherwise the survival rate will be affected.

3, entering the pool and quarantine disinfection. The choice of ponding time has a great influence on the overwintering effect of fish species. Generally, when the water temperature drops to about 10°C, it is better to enter the pool. When entering the pond, wash the fish species with 2%-5% saline solution for 15 minutes to prevent fish diseases. The wintering pool spreads.

4, stocking density. Each acre stocking 10-13 cm species of 3-5 million fish or 1 meter per acre 500 to 750 kg.

Second, feeding and management

1. Water quality: The transparency of wintering pond water can generally be maintained at 30-40 cm. If the water quality is too fat, it can be solved by water injection and water exchange; when it is too thin, it can be used to fertilize and fertilize water, and 2 meters of water is applied per mus of ammonium nitrate. - 6 kg, 3-4 kg of superphosphate.

2. Feeding: By top dressing, cultivate the amount of phytoplankton. At the same time, on a warm sunny day, feeds are properly fed according to the species activity.

3. Others: In case of snow freezing, oxygen should be removed by removing ice from the snow, so that the dissolved oxygen in the water is not less than 1 mg/L, and the snow removal area is not less than 80% of the total water surface to ensure the conditions required for photosynthesis. At the same time, stepping up the ponds to inspect the activities of fish and other organisms in the water.

Third, fish disease prevention

In this period, there are frequent episodes of red skin disease and watery mildew. Red skin disease: Every 0.15 to 30 days, use 901 fish bacteria net 0.3 to 0.5 g of water per cubic meter. The whole pool is sprayed evenly. When the temperature is high on sunny days, enrofloxacin baits are given; Saprolegnia: available 4% The salt water was used to dip the sick fish for 5 minutes, 5 kg of salt per acre, and 15-40 kg of urine was evenly spilled.

Mottled Waxy Corn Cut

Color waxy corn is generally white, yellow, red, purple and black, white, yellow and purple corn is the basic color. The purple gene in a purple/white hybrid will naturally become purple if it "beats" the white gene, and vice versa, if it's a tie, what we see is a white/purple corn. Purple can turn into red corn and black corn, which is often called "red is purple, black is purple."


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