Piscis Austrinus, constellation in the southern sky at about 22 hours right ascension and 30° south in declination. Its brightest star is Fomalhaut (from the Arabic for “the fish’s mouth”), the 17th brightest star in the sky, with a magnitude of 1.16. The connection of this constellation with a fish probably came to Greece from Syria or Phoenicia, since Piscis Austrinus was identified as a fish that saved the Syrian fertility goddess Derceto from drowning.