Silver cod fry pond domestication technology explanation

Pond domesticated silver cod fry temperament, the sexually mature female fish and male fish 1:1 ratio injection of oxytocin, did not find the phenomenon of chasing. The artificial oxytocic drugs were chorionic gonadotropin (HCG), luteinizing hormone-releasing hormone analog (LRH-A2) and DOM, and the injected dose was similar to that of carp. Females were examined 20 hours after drug injection and artificially inseminated.

The mature eggs of big scaled barb were milky white, floating eggs with a diameter of 1.52~1.56 mm, and the fertilized eggs absorbed water and swelled up with a diameter of 4.5~4.8 mm. The fertilized eggs were incubated at a water temperature of 23~25 ℃, and the membranes came out of the membrane in 65~70 hours, and the incubation cumulative temperatures ranged from 1610~1625 ℃.

The weights of 4-year-old female barbs were 1065-1550 g, the gonad weights were 17-24 g, and the coefficients of sexual maturity were 1.1% and 2.3%; the weights of 5-year-old females were 2600 and 3150 g, the gonad weights were 100 and 295 g, and the coefficients of sexual maturity were 3.8 % and 9.37 %; the weights of 4-year-old males were 630 and 720 g, the gonad weights were 5.45 and 6.52 g, and the coefficients of sexual maturity were 0.87 % and 0.88 % respectively. At age 4, males weighed 630 and 720 g and had gonad weights of 5.45 and 6.52 g, with sexual maturity coefficients of 0.87 and 0.91 %, and at age 5, males weighed 1,800 g and had gonad weights of 32.8 g, with a coefficient of 1.82 %.

Silver cod fry fall culture skills

The arrival of autumn, the weather gradually become cooler, for the silver cod fry breeding, and is facing a major problem, many people will stare at the silver cod fry fall culture should pay attention to what details?

Next, we will give you the popularization of silver cod fry breeding notes:

1. often playing oxygen

2. on time to feed

3. do a good job of disease control

4. pay attention to the pollution of the water