Effects of 17α-ethinylestradiol (EE2) on growth indices and hematological parameters in fresh water angelfish (Pterophyllum scalare)

Due to the high stability properties of estrogenic compounds, most of them accumulate in aquatic organisms. This feature can directly or indirectly affect the growth rate of aquatic animals. The purpose of this study was to determine the possible effects of 17-alpha-Ethinyl estradiol on growth indices and blood parameters in freshwater Angelfish. According to this, accidentally 63 specimen’s angel fish with a mean weight 4.31± 0.46 divided equally to 3 groups in three replicates. EE2 not used in the control group, while for second and third groups the amount 2.5 and 5 µgkg-1 used respectively that in which combined the ethanol evaporation method. The angelfishes feed two times a day to the fullest extent. In this experiment, significant increasing (p < 0.05) observed to the specific growth rate (SGR) (0.22 % per day) and condition factor (1.76) in second group angelfishes than other groups. Also, significant variations (p < 0.05) performed to hematological indices in angelfishes that feed to different levels of EE2. This variations was increasingly the amounts that red blood cell (RBC) count, white blood cell (WBC) count, hemoglobin (Hb), hematocrit (Ht), blood hemoglobin level, Mean corpuscular hemoglobin (MCH), Mean corpuscular hemoglobin concentration (MCHC) in second and third groups than control group, respectively. Evaluate of results in this study shows that limit using of EE2 hormone can result in growth increasing in angelfishes.