"son of fish knows how to swim" meaning and usage

Question

What the saying "son of fish knows how to swim" actually means? does it contain positive or negative connotation? Thank you!

Tuffy · Answer

It comes from a Portuguese saying:

filho de um peixe pode nadar

It is not a familiar saying, but a near equivalent English saying might be something like

Like father like son

Literally, the Portuguese means

A fish’s son can swim

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