The high water white fishes are cold-water fishes with a relatively wide range of adaptation temperatures and can live in water bodies at a water temperature of 1°C to 28°C. They can tolerate slightly acidic or partially alkaline water bodies and can tolerate lower dissolved oxygen (2 mg/kg). Rise). The white pelagic juveniles feed on rotifers, nauplii, and can take larvae, copepods, aquatic insects, and benthic organisms as they grow older. The high white pheasant is mature enough to reach 25 cm to 35 cm in length at sexual maturity and weighs 300 g to 350 g. The artificial propagation of the high white pheasant generally uses artificial oxytocin, but broodstock must be cultivated before this. When the water temperature is below 6°C, the broodstock may not spawn but may spawn on their own. At this time, the broodstock can be manually spawned and fertilized by artificial means.
Egg collection and fertilization
Dry insemination: Move the broodstock before delivery to the room and squeeze the fish's eggs into a clean porcelain box by squeezing the abdomen without direct sunlight. Then squeeze the fish's semen onto the eggs. Above, stir evenly with feathers to fully fertilize eggs before hatching. Breeding broodstock ratio of 1:1, or slightly more male fish.
Wet fertilization: Generally carried out outdoors on a cold day, sperm and eggs are obtained as described above. During the fertilization process, an appropriate amount of physiological saline or lake water is added to prevent freezing of the eggs. Immediately after fertilization, milk is added and stirred, then placed in a plastic bag for a few hours before being sent to the hatchery for hatching. The eggs must not exceed 30% of water volume during transport.
Incubation of fertilized eggs
To increase the hatching rate of fertilized eggs, eggs should be washed and de-adhesive immediately after fertilization. The main purpose of egg washing is to wash unfertilized eggs, abnormal eggs and mucous substances to prevent the development of fertilized eggs from being affected. The method is to wash the fertilized egg several times with 10 mg/l tricyryl acid solution added to the container; or add 25% talcum powder suspension to the fertilized egg to stir it, and then rinse it again, which can also play a role in detackification effect.
Fertilized egg hatching can be carried out in glass steel tanks, concrete tanks and other containers. The fertilized egg hatching in Russia is performed in a special incubator. The incubator has a volume of 4 liters to 5 liters and incubates 600,000 to 800,000 fertilized eggs at a time. During the incubation process, the flow rate of water is maintained at 2 liters to 6 liters per minute, the water temperature is 1°C to 4°C, and the effective temperature for incubation is 300 to 400 degrees. In general, larvae come out of membranes in April, but at this time there are ice layers in lakes, and there are also less zooplankton. In order to increase the survival rate of larvae with enough food, the hatching temperature can be properly adjusted during hatching and the larvae can be filmed out. Deferred zooplankton to the lake can meet the needs of the film. Approximately 5 days after the larvae are filmed, they can start feeding.
Note: There are two factors that are important during the incubation of fertilized eggs. First, the incubation temperature should be maintained between 2°C and 3°C. High or low will affect the hatching rate. Second, the dissolved oxygen level in the incubation water should be maintained above 8 mg/L. The minimum should not be lower than 5. Mg/l.
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