To study the effects of mercuric chloride on kidney and intestine tissue of Persian Sturgeon. Acipenser persicus fry. fish exposed freshwater contain 15 ppb of mercuric chloride and control group were kept in non polluted freshwater for 48 hours. Histological studies of the processed tissues showed marked histological alterations than the control group that exposed only to freshwater. https://cosmeticssquadets.shop/product-category/lamps/