Artificial breeding technology of semi-smooth tongue

1. Broodstock fishing and culturing Trawling semi-smooth tongue licks are used to pick individuals older than 3 in age, with intact fish, normal color, healthy and lively, and with a light body surface. The breeding density of broodstock is 1 to 2 tails per cubic meter, and the ratio of male to female is 1:3. The female is about 550mm in length and the male is about 280mm in length. The cultivation water is natural seawater that has been sedimented and filtered, or deep well water that is stabilized by physical and chemical indicators and meets the standard; the water temperature is maintained at 21 to 23°C, the salinity is 25 to 35, and the dissolved oxygen is sufficient. Daily feeding 4 times, if you feed fresh fish, but also in the feed to add polyunsaturated fatty acids, vitamins and minerals, etc., in order to promote gonadal development.
2. Fertilized eggs hatched by artificial insemination method to obtain fertilized eggs, the fertilized eggs were placed in a glass aquarium hatch, using micro-circulating water, the temperature is maintained at 21 ~ 23 °C, dissolved oxygen is sufficient. The suitable salinity for fertilized eggs is 25 to 35, preferably 33. After 30 ~ 39h can be hatched larvae.
3. The hatched larvae of the seedlings are kept in the glass aquarium. The microcirculation water is used to keep the water quality stable. The daily water exchange volume is controlled at 1/4 to 1/2 of the total culture water; the hatching begins on the second day after hatching. The rotifers were fed twice a day and the feeding amount was 5 to 10 ind/mL. The density of the unicellular algae in the water was maintained at 1 million cells, and then the amount of rotifers was gradually increased to reduce the density of the unicellular algae. On the 12th day, it began to increase the feeding of small copepods, and the feeding amount was 2-5 ind/mL. After larvae have been bred for about 20 days, they are metamorphosed into juvenile fish. At this time, they should be transferred to an indoor cement pond for cultivation. The water temperature should be maintained at 20-23°C, pH 7.9-8.4, and the daily water exchange volume should be 1/2 to 2/3 of the total body of water. , Inflate 4 times a day to maintain adequate dissolved oxygen; feed 3 times a day, feeding rotifers, copepods, and Artemia nauplii, and later increase the amount of fish fed the appropriate amount. At approximately 60 days of age, juveniles enter the juvenile stage; by the age of 300 days, juveniles have a total length of more than 50 mm and can enter the culturing stage.

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