This study was designed to determine the effects of five different salinity levels (25, 30, 35, 40 and 45 ppt) on survival rate Farfantepenaeus aztecus larvae from Nauplius5 post-larvae1 (N5-PL1). For this purpose, 50 that reached N5 stage were stocked in 2-L round bottom glass flasks replications grown up PL1 at 27.6±0.4°C. At end study, as highest (44.00±23.15) protozoal stages obtained 35 pp...