How do fish reproduce?

How do fish reproduce?

Female fish lay eggs – they generate. The male fish discharge their semen on the eggs, and thus fertilize them. Numerous fish like the salmon return to their place of birth for laying eggs. The salmon eggs hatch in streams and from freshwater fish transform into saltwater fish in 1 – 3 years. At that point, they stay in the ocean up to 4 years. When they wish to reproduce, they come back to their birthplace covering a distance of as much as 6000 km. They need to swim against the current and beat every one of the obstacles in their way. Once at the destination they spawn. It is a mystery how the salmons discover their birthplace. Researchers accept that they are guided by the magnetic field of the Earth.

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