According to the provided temperature, the higher the temperature, the faster the culture time. If the water temperature can be stabilized between 15 and 20 degrees, the incubation days will be 5 to 7 days. If the water temperature is around 20 degrees, it can hatch in 4 to 5 days. If the water temperature is 20 to 25 degrees, it takes 2 to 3 days to hatch. When the water temperature is low, the incubation time will be longer.

The hatching conditions of fish eggs should be slightly changed compared with the usual conditions of fish farming. For example, the water temperature is generally around 20 degrees to 25 degrees, and the hatching of fish eggs needs to be two degrees higher than usual.

When the fish eggs hatch, the oxygen in the fish tank should always be sufficient, and there should be no lack of oxygen. Otherwise, the fish eggs will not be able to absorb oxygen during the embryonic period, and it is very likely that they will not hatch. There is also the requirement for water quality. Only clean water can hatch successfully.

Breeding method of hatching small fish

1, feeding

After the eggs hatch, the first thing to do is to feed them. Don't feed on the first day of incubation. At this time, the fish can continue to absorb the nutrition in the yolk sac without eating and feed it the next day. It is best to choose backwater feeding. If not, you can feed some cooked egg yolk or soybean milk, but you should control the dosage to avoid poor water quality.

Step 2 change water

Don't change water easily because the newly hatched fry have poor adaptability to water quality. Change the water for the first time on the seventh day after hatching. Don't change too much. Change the water a little and see what happens. Under normal circumstances, as long as the feeding is not excessive, the water quality will not deteriorate easily, and it is not necessary to change the water frequently.

3. Temperature control

Different from adult fish, fry have poor adaptability to temperature, and must live in a higher water temperature, which is generally about 2℃ higher than that of adult fish, so as to grow rapidly and must be kept at a constant temperature. Temperature changes are most likely to affect the health of fish.