Toxic Effect Of Mercuronitrate (Hgno3) On Viscera Organs Of River Fish

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Mercury waste is one of primary polutants found in the environment, either from industrial, hospital and household wastes, agricultural acitivities, or volcano eruptions. Mercury is a metal element that occurs naturally in the environment. Experiment carried out to assess mercurous salt on the development of freshwater fish, ie Cyprinus carpio, Oreochromis niloticus, Pangasius hypophtalmus, Channa strata, and Clarias batrachus. The results of experiments showed that sensitivity grade of each fish are quite difference in accordance with the ability of fish to detoxify mercurous salt absorbed to fish body. There are many similarities in the toxic effects of the various forms of mercury, but there are also significant differences. Toxicity test result showed that Oreochromis niloticus is very sensitive to this polutant with LC50 0.99 ppm. The lowest sensitivity grade is found for Cyprinus carpio, LC50 2.03 ppm. Respectively, sensitivity grades for each species are Pangasius hypophtalmus (LC50 1.91 ppm), Clarias batrachus (LC50 1.70 ppm), and Channa strata (LC50 1.60 ppm).



Histopathological changes, organ vicera, freshwater fish, mercury (Hg)