The GIFT Foundation International Inc., Philippines, provided 63 full sib groups of 35 fish each, which were progeny from single pair mated parents (i.e. 63 males each mated to a different female). These fish belonged to the sixth generation of selection of GIFT, and were received at Jitra, Kedah State, Malaysia, in batches towards the end of 2000 and during the beginning of 2001.