The effects of salinity on growth performance spats Pinctada radiata collected from the natural environment by collect hypnotics constructed around the Henduraby Island in the Persian Gulf.  On 5 different salinity treatments with different salinity of 25, 30, 35, 40 and 45 with microalgae Isochrysis aff galbana culture medium with F / 2, Studied. Spats  in a Total of  adaptation were sampled and measurements of the length Ventral (DVM) and heel length (HL), thickness (Th) mm and weight (W) 20 liter container containing 15 g per liter of seawater filter data recording .All statistical and analysis were Performed using the SPSS 16 and Excel software package. 5 salinity treatments showed that the maximum length of 18.14±0.93, the heels 19.26 ± 0.65, thickness 5.52 ± 0.30 and weight of 0.96   ± 0.10  salinity of 35. Nevertheless, no significant differences were observed in the treatments in terms of total length, heel length and thickness (P> 0/05). But there was a significant difference in weight between treatments (P< 0/05) .The results showed that the best salinity for Pinctada radiate growth was 35 ppt.