Abstract: The paper describes the embryonic development of the catfish, Clarias fuscus, through a culture procedure of chorion-free fertilized eggs. Based on the innate characters of the embryonic development, the author proposes three main developmental stages of this fish embryo: cleavage, cell differentiation, and organ differentiation, and analyses the adaptation of the embryonic development to the surroundings also. According to the distinguishing features of this embryo, the author discusses some problems relevant to artificial propagation of this fish and suggests that the embryo of Clarias fuscus is a rather ideal experimental object in the study of cell engineering.