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Zebra danios are not live-bearing fish, so they do not get pregnant. Instead, the female will lay eggs, and the male will fertilize them. The eggs will hatch about 2 days after being fertilized.
Hatch time for fish eggs is completely dependant on the species of fish. Some fish take only a few days, where others can take over a month.
It depends on how craw the fish is
When fish eggs hatch the little fish can swim immediately.
Generally, cichlid eggs such as those laid by convicts hatch in three to five days. Convicts are relatively easy fish to breed.
Hatch time for fish eggs is completely dependant on the species of fish. Some fish take only a few days, where others can take over a month. by : Jan kosiek
It takes about 2 to 3 months for salmon eggs to hatch. Use the link below to get more information on the life cycle of this amazing fish.
Arowanas are mouth breeders, that is, the male will carry the fertilized eggs in his mouth and protect the young once they hatch. See the link below for a good overview of this fish's reproductive habits.
Different fish species need different temperatures and each have different hatching/development time.
It takes 2 to 3 days for the eggs to hatch.
2 to 5 days usally but only having two percent chance to live they will be white if dead.