Acute Toxicity of Mercury Associated to Selenium, to Minnows Tilápia Oreochromis niloticus
DOI:
https://doi.org/10.5132/jbse.2007.03.006Palabras clave:
mercury, Oreochromis niloticus, selenium, toxicityResumen
The aim of this study was to evaluate if the two forms of selenium (sodium selenite – Se4+ and sodium selenate – Se6+) have antagonistic effect on the acute action of mercury chloride (HgCl2) by toxicity acute tests, using minnows of tilapia, Oreochromis niloticus as test-organisms. The treatments consisted of: I) control group; II) only Hg; III) only Se4+; IV) only Se6+; V) Se4+ + Hg; and VI) Se6+ + Hg. The following concentrations were used in the test: 0.4 mg L–1 of Hg (considered as lethal median concentration – LC50) and 1.0 mg L–1 of Se (considered as non lethal effect concentration – NOEL) for two selenium forms. After 24 hours of exposition to the treatments that contained mercury, the fish presented clinical signals of poisoning, such as: hyperactivitiy, skin darkness, swimming disorder, difficulty for breathing, and death. There were no differences statistically significants (p > 0.05) in the mortality between the treatments II-V, and II-VI, indicating the absence of antagonistic effect between these elements. Results discussed in this paper suggest that the concentration of Se (NOEL) used in the present study perhaps has exceeded the molecular ratio of 2.5 : 1/(Hg : Se) supposedely considered as suitable for interacting atagonisticaly in the toxicity of mercury.
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Derechos de autor 2007 Ecotoxicology and Environmental Contamination
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