Spawning grounds and spawning times of the sand flounder,Rhombosolea plebeia(Richardson), and the yellow‐belly flounder,Rhombosolea leporinaGunther, in the Hauraki Gulf are described. The occurrence of female fish at different stages of ovarian development at different stations during the year, the distribution of eggs in the plankton, and changes in ovary weight during the year were used as indicators of spawning grounds and spawning times.