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 inseminated.
Egg collection and insemination
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. On the other hand, stir well with feathers and inseminate the eggs before hatching. Breeding broodstock ratio of 1:1, or slightly more male fish.
Wet insemination: Generally performed on a cold day outdoors, sperm and eggs are obtained as described above. During the insemination process, appropriate amount of physiological saline or lake water is added to prevent freezing of eggs. Immediately after insemination, milk is added and stirred, then placed in a plastic bag for a few hours before being sent to the hatchery for incubation. The eggs must not exceed 30% of water volume during transport.
Insemination of fertilized eggs
In order to increase the hatching rate of insemination eggs, egg washing and de-adhesion should be performed immediately after egg insemination. The main purpose of egg washing is to wash off the uninseminated eggs, abnormal eggs and mucous substances to prevent the development of fertilized eggs from being affected. The method is to use 10 mg/L tricyryl acid solution added to the container to rinse the fertilized egg several times; or add 25% of the talcum powder suspension to the insemination egg to stir it, and then rinse it again, which can also play a role in detackification. effect.
Insemination of fertilized eggs can be performed 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 between 600,000 and 800,000 fertilized eggs each 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 insemination 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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