Morpho-cytological patterns of juvenile Acipenser persicus on basis of structure, size and distribution of kidney nephrons were studied. Sampling of head, body and caudal parts of the kidney in the fish aged 1 and 2 years were carried out (3 specimens of each age). Area, length and small diameter of nephron cells were measured by light microscope and Biocome Visolab software. We observed the kidney of A. persicus consisting of: Glomeruls, Bowman's capsule, Proximal, Distal and Collecting tubule. The statistical analyzes showed no significant difference in the area, length and small diameter between the two ages. Furthermore, the results showed that the average area in 1 and 2 year old fish were 4004.28±2486.63 and 4614.64±1261.69 mm in proximal cells, 2529.75±1015.51 and 4747.33±1676.03 mm in distal cells, 2220.98±1668.87 and 3253.48±1747.25 mm in collecting tubules, 4692.37±1739.79 and 9355.37±2073.92 mm in Glomeruls, 6768.23±1640.54 and 129210.07±1775.76 mm in Bowman's capsule, respectively. The average length and small diameter in 1 and 2 years old fish were 84.75±24.99, 53.52±14.03 and 82.76±7.46, 66.00±7.37 mm in proximal cells, 72.98±16.28, 51.10±15.00 and 77.95±9.43, 64.57±8.34 mm in distal cells, 60.52±13.69, 49.02±12.60 and 66.40±12.21, 57.40±14.20 mm in collecting tubules, 94.70±16.97, 72.78±12.75 and 129.04±23.59, 96.60±18.88 mm in Glomerules, 120.99±14.86, 80.77±9.78 and 144.76±21.12, 107.56±21.53 mm in Bowman's capsule, respectively. In all cases, no significant differences were found between measured cell of the 1 and 2 year old fish (P>0.05). Also, the modeling showed the kidney of A. persicus was Y shaped in which the distribution of different cells is not homogenous in all sections of the kidney.