Salinity is one of the important factors having strong effects on growth rate, survival rate and rearing efficiency of many fish species in general and orange cIownfish in particular. In this study, eight levels of salinity were experimented in order to identify the most suitable salinity for rearing adult orange cIownfish (5, 10, 15, 20, 25, 30, 35 and 40 thousandth). Results showed that the fish reared at the salinities of 35 and 30 percent0 gave the highest specific growth rate (1,37 and 1,36 percent/day), followed by the salinities of 40, 25 and 20 thousandth (1.10
1,07 and 0,93 percent/day), the lowest at the salinities of 15 and 10 percent0 (0,67 va 0,35 percent/day)
(P 0,05). Similarly, the fish reared at the salinities of 35 and 30 thousandth gave the highest standard length (38,07 va 37,96 mm), followed by the salinities of 40, 25 and 20 thousandth (35,05
34,84 and 33,41 mm) and the lowest at the salinities of 15 and 10 thousandth (30,88 and 28,07 mm)
(P 0,05). The fish reared at the salinities of 30 and 35 percent0 obtained the highest survival rate (100 and 100 percent), but not different from those of the salinities of 40,25 and 20 thousandth (97,41
98,52 and 97,41 percent) and the lowest at the salinites of 10 and 5 thousandth (80,77 and 0 percent). From the results of this study, it can be suggested that the most appropriate salinity for rearing the adult orange fish should be between 30 and 35 thousandth in order to optimize the growth, survival rate and economic efficiency.