Hatchfish hatching technique

1. Fertilization method

(1) Select a white-tailed pike with a mature age of 2+ as broodstock, and weigh between 700 and 1000 grams.

(2) Dry insemination is used. After insemination, talcum powder is used for detackification. When artificial insemination is performed, the fish is first wiped with a cloth, and the female eggs are first squeezed into a dry basin. At this time, contact between the unfertilized eggs and the water body should be avoided as much as possible. Fertilized egg swelling can affect the fertilization rate.

2. Fertilization process

(1) In the first three days of fertilization, the fertilized egg is the unstable period of sperm-egg binding, and it is advisable not to stir.

(2) pH value: The optimum pH is between 7.5-8. If the pH is lower than 7.5, it can be adjusted by using analytical sodium bicarbonate.

3. incubation

(1) Incubation density: 150,000 to 300,000 grains/m 2 were laid in the hatchery frame.

(2) Hatching in low light. The first two days of hatching are sensitive periods and light and vibration must be avoided. The color of the fertilized egg during hatching changes from yellow to yellowish green due to changes in the pigment of the embryo, and finally turns dark brown. The newly hatched fry has an adhesive on the back of the head and the seedlings are adsorbed on the brown sheet or cage wall.

(3) During the incubation process, the temperature can be naturally increased, but care must be taken not to overheat the temperature, and the temperature does not exceed 0.5°C/hour. Dissolved oxygen requirements 7 ~ 9 mg / l, suitable for incubation water temperature between 8 ~ 12 °C.

(4) The screens on all sides of the hatching box and the fish screens at the outlets should always be washed and checked to ensure smooth water circulation.

(5) In the hatching process, the flow of water should be reduced in the early stage of the film, and the eggs can be easily moved. Large water flow can easily cause the death of eggs.

4. Emergence

(1) The seedlings should be removed in time after the film is released. Special attention should be paid to not allowing the seedlings to sink to the bottom together with the egg membranes. This can easily cause suffocation of the seedlings.

(2) The stocking density of the seedling pool should be determined with the growth of seedlings, and the density is too large to cause anoxic asphyxia.

(3) The water used for the seedling pool must be running water. The dissolved oxygen must also meet certain standards. Oxygen can be used to increase oxygen levels, while the oysters can cause hypoxia and congestion in the fry, leading to a large number of deaths.

5. Seed stocking

(1) Seed selection: Choose the white-spotted dogfish waterspray with strong constitution, good plumpness, no disease and no injury, and the same specifications.

(2) Disinfection of seed: Use 3% to 5% salt water to dip the fish for 3-5 minutes to prevent watery mildew.

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