Changes in plasma thyroid hormone levels in Epinephelus stoliczkae under the influence of different amounts of chromium

Blood parameters are sensitive to environmental stressors and are considered as a non-destructive method in assessing fish health and ecosystem status. The aim of this study was to investigate the effect of different concentrations of chromium metal on the levels of thyroid hormones in the Epinephelus stoliczkae of Oman Sea in laboratory conditions. The Epaulet grouper were exposed to three concentrations of ۳.۶, ۷.۳۱ and ۱۴.۶ mg per liter of chromium for ۲۱ days, and blood samples were taken from the fish at ۰.۵, ۱, ۷, ۱۴ and ۲۱ days from test start. The levels of triiodothyronine (T۳) and thyroxine (T۴) in plasma were measured by radioimmunoassay. The results of thyroid hormone levels in different concentrations of chromium metal compared to the control group showed a significant decrease (P <۰.۵). This indicates a disturbance in the balance of thyroid hormones as a result of the negative effects of chromium metal on the Epaulet grouper.

کلیدواژه ها:

Marker ، Heavy Metals ، Chabahar Bay ، Oman Sea