The result s obtained from fixing sex pheromones to the inside surface of the artif icial ceramic spawning nests showed that ovarian extract attracted more males than females to enter the nests, while testis extract and seminal vesicle extract attracted more females than males. 17A- P, 17A, 20B- P and PGE2 were equally effective in attracting both females and males. Spawning frequencies and the spawned egg number of females as well as fertilization rates were related to different kinds of sex pheromones. The mo st spawning frequencies were found in both 17A, 20B- P and PGE2 treated groups. The greatest spawned egg number and the highest fertilization rate were observed in PGE2 group. The levels of 17A- P in seminal vesicle extract and test is extract were signif icant ly higher ( P < 0. 05) than that in ovarian extract . The levels of PGE2 and PGF2A in seminal vesicle extract were signif icantly higher ( P < 0. 05) than those in testis and ovarian extract. The levels of both PGE2 and PGF2A in sexual organs were in the order of seminal vesicle extract > testis extract > ovarian extract. The mean EOG, stimulated by ovarian extract , was higher in males than in females, whereas the mean EOGs, stimulated by testis or seminal vesicle extract, were higher in females than in males. The mean highest EOG of both females and males in response to 17A- P, 17A, 20B- P, PGE2 and PGF2Awas observed in PGE2 group.