Note 144 — Chapter XLI · THE INCARNATIONS OF VISHNU.
Manmatha Nath Dutt translation
Satyavati was the daughter of a Apsara in the form of a fish. She passed into the hands of a fisherman. A Rishi, Parasara by name, grew amorous on seeing her. He knew her and in time she gave birth to a son on an island in the Yamuna. This son is Vyasa. See Mahabharata, Adi Parva chapter LXIII.