Abstract

IANNACONE, José  and  ALVARINO, Lorena. Aquatic ecotoxicity of two dyes and three antiparasitics of Importance in aquaculture on employing daphnia magna. Ecol. apl. [online]. 2007, vol.6, n.1-2, pp.101-110. ISSN 1726-2216.

Ecotoxicological assessment of pharmaceutical products in aquatic environments is an area of emerging research at global level. The aims of the current research were to evaluate aquatic toxicological effects of two aquaculture important dyes: methylene blue and malachite green, of three anthelminthic antiparasitic products, of two natural products Parasin® and leche de ojé®, and of the synthetic chemical albendazole-praziquantel on Daphnia magna Strauss 1820 (Crustacea: Daphniidae). On D. magna (LC₅₀ at 96 h exposure), the highest effects were found with methylene blue (LC₅₀= 0.38 mg·L^-1) in comparison to malachite green (LC₅₀= 2.97 mg·L^-1). In relation to antiparasitic products on D. magna (LC₅₀ at 48 h), the highest effects were found with leche de ojé (LC₅₀= 0.07 %) in comparison to Parasin (LC₅₀= 0.99 %). Praziquantel (LC₅₀= 30.07 mg·L^-1) and albendazole (LC₅₀= 180.4 mg·L^-1) were observe to produce effects on D. magna at 48 h of exposure. Both dyes produced high effects in terms of LC₅₀ on D. magna in relation to concentrations required for their use in aquaculture. Both antiparasitic natural products produced risks in aquatic environments at concentrations less than 1%. The quotient risk technique indicated that praziquantel and albendazole did not produce risks on an aquatic environment.

Keywords : albendazole; methylene blue; ecotoxicology; praziquantel; water flea; malaquite green.

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