Breeding method for hypoxic resistant pseudobagrus ussuriensis pedigree
A Ussuri and pedigree technology, applied in the field of artificial breeding in aquaculture, can solve the problems of poor hypoxia tolerance, restricting the healthy development of the aquaculture industry, floating heads and even pan-ponds, etc., to speed up the cultivation process, clear the source of fry, The effect of good induction of labor
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Embodiment 1
[0027] Example 1 Selection of breeding parents of Ussuri bream and induction of labor
[0028] The parent of Ussuri breamus used in the present invention has been cultivated and strengthened in the previous year. Select 20 female fish, weighing between 100 and 150 grams, with a swollen, soft and elastic abdomen, and the outline of the ovaries can be seen on the abdomen, without injury. There are 6 males, with long and pointed reproductive processes and red ends, strong physique, no injuries, and a weight of 250 grams to 310 grams. After the parents are selected, they are placed in a spawning pond with a diameter of 1.7 meters and raised temporarily for 3 days, and no feed is fed during the temporary raising.
[0029] The first injection of oxytocin: preparation of LRH-A 2 Oxytocic agent, 25 micrograms of LRH-A 2 Use 1 ml of 0.75% normal saline to dissolve, and then dilute the drug with 0.75% normal saline. The injection dose for each female fish is 5 μg / kg, and the injectio...
Embodiment 2
[0031] Example 2 Artificial insemination and hatching of Ussuri catfish
[0032] Under the condition of water temperature of 20-23°C, at 14:00 on May 27, 29 hours after induced labor, the female fish's abdomen was lightly pressed, and the eggs flowed out, indicating that the effect time was reached. Fish out the brood fish, dry the male fish, cut open the abdomen and take out the testes, cut them into pieces in a mortar and grind them, then add 100 ml of Hanks liquid; squeeze the eggs of each female fish into different petri dishes, and put 20 female fish in Eleven of them were able to successfully squeeze out the eggs, and then poured the diluted male semen into the petri dish containing the eggs, and quickly stirred them with feathers to fully contact the sperm and eggs. The ratio of female to male fish was 3:1. After stirring, let it stand for 1 minute, and then arrange the fertilized eggs in 11 petri dishes evenly on the sterilized polyethylene mesh with a size of 50×60 cm...
Embodiment 3
[0034] Embodiment 3 Cultivation of Ussuri pufferfish fry
[0035]The newly hatched juveniles do not need to be fed because they rely on the yolk sac to provide all the nutrients for early development. After 4 days of hatching, the yolk was basically exhausted, and the fry opened their mouths to feed. The newly hatched Artemia nauplii were used as the opening bait, and fed 4 times a day with an interval of 6 hours. The appropriate amount of feeding was some Artemia larvae that were still not ingested 30 minutes after feeding. After feeding for 6 days, the chopped red blood worms were used as bait to continue the cultivation. During the entire fry cultivation process, suck the dirt every 8 hours and replace about 1 / 3 of the water to keep the water quality fresh. After raising to a body length of 1.5 cm in the hatching bucket, replace the large cement pond or raise it in the pond.
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