Commentary for Bekhorot 15:42

This is the correct version: The dulfanin reproduce with people - if a person lies with one of them, they can produce offspring.

The dulfanin reproduce like people - The correct version is given by Rashi and is proven by the Tosefta [chapter 1]: they can reproduce from humans.

Sons of the sea - there are fish in the sea that are half in the form of a man and half in the form of a fish. Sirene in old French.