This study was conducted under two separate environmental and experimental conditions. Theenvironmental component was carried out at several creeks in the Persian Gulf whilst the experimental phasewas at conducted in recirculating seawater tanks. Mercury concentrations were determined. Results of thepresent investigation indicated that the sub- acute and chronic mercury concentrations tested may causeseveral changes in the biochemical and hormone parameters of the studied fish and we can use these changesas biomarkers of mercury contamination. The range of mercury concentrations found in the creeks andparticularly in sediments along the Mahshahr coast was higher than other marine environments. It is suggestedthat the hormonal indices testosterone, T3 and T3/T4 and metabolite indices total protein can be consideredas suitable and effective biomarkers of mercury pollution in yellowfin seabream.
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