The present paper deals with the study of the gonadal dovelopment of groy mul-lets. It is aimed at knowing whether the grey mullets can spawn or not in given condi-tions. The characteristics or oocytes in different stages of development were noticed. 1. The cycle of the sexual maturity of the grey mullets is in accordanco withthe development of the gonad. First maturation of the fish is at the third year andthe spawning time is between November and December. 2. The growth and development of grey mullets in the Xinglin Wan are similar tothose in Florida,but they are faster than those in the Mediterranean Sea and the Black Sea. 3. The grey mullets in the closed Xinglin Wan require artitificial injection withhypophyses to promote their maturation. 4. The ovaries of the Ⅱ, Ⅲ, Ⅳ and Ⅳ-Ⅱ stages, were examined in 104 femalesamples. 5. The gonad is absorbed after December, because the fish are isolated from thespawning ground in the open sea. The process of absorption is taken place from the lastten days of November to January and February next year.