Effect of Gamma Radiation on the Growth and Survival of Eggs and Hematological Parameters of Rainbow trout (Oncorhynchus mykiss) Larva

The aim of this trial was to evaluate the effect of gamma radiation on growth and hematological parameters of rainbow trout (Oncorhynchus mykiss) larvae. In this research, Rainbow trout of eggs were irradiated by low (1, 2.5, 5Gy) and high doses (10, 20, 40 Gy) of gamma radiation. After 90 days, the growth and survival eggs and blood parameters of larvae was investigated. The result showed the negative effects of a gamma ray, as the increase in levels of radiation caused a significant decrease in the growth and survival of all treatments. Eggs exposed dose 40 Gy of gamma radiation, destroyed. The highest rates of growth and survival obtained in the control treatment and increased radiation levels, brought about significantly decreased on mentioned parameters. A decreasing trend in blood parameters was observed when the radiation levels increased. In all treatments, levels of RBC (red blood cells), Hct (hematocrit) and Hb (hemoglobin) declined significantly (P<0.05) as the irradiation levels increased, where as the amount of MCV (Mean corpuscular Volume) and MCH (Mean corpuscular hemoglobin) not changed. Also the levels of white blood cells (WBC), lymphocytes and monocytes, decreased, that this reduction was not significant (P<0.05). The results suggest that gamma rays can be a potential candidate for damage cells, resulting in decreased of growth and survival of eggs and larvae of hematology of rainbow trout.