Toxicidade aguda de selenito e selenato de sódio para alevinos de tilápia, Oreochromis niloticus

Autores

  • Maria José T. RANZANI-PAIVA Scientific Researchers. Fisheries Institute
  • Julio Vicente LOMBARDI Scientific Researchers. Fisheries Institute
  • Adriano GONÇALVES CAUNESP-FCV/UNESP - Campus Jaboticabal

Palavras-chave:

selênio, toxicologia aquática, peixe, aquicultura

Resumo

O selênio é um nutriente essencial para muitos organismos. Este sal pode ser liberado na água por processos naturais, pela dissociação de rochas e minerais, ou por restos de processos industriais e de atividades agrí­­colas, aumentando desta maneira sua concentração no ambiente, levando a efeitos tóxicos para a biota aquática. Concentrações Letais Medianas (CL50-96h) de duas formas de selênio foram estimadas para alevinos de tilápia-do-nilo, Oreochromis niloticus, com o intuito de estimar indicadores para futuras avaliações de risco ecotoxicológico em recursos hí­­dricos contaminados com estes elementos, especialmente para avaliar as fontes de qualidade de água apropriadas para a tilapicultura. Os resultados obtidos foram: CL50-96h de selenito de sódio (Na2SeO3) = 4,42 mg Se4+ L-1, e CL50-96h de selenato de sódio (Na2SeO4) = 14,67 mg Se6+ L-1. A partir desses valores foi possí­­vel classificar o selenito de sódio como altamente tóxico e o selenato de sódio como moderadamente tóxico para alevinos de tilápia.

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2018-07-12

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Nota cientí­­fica (Short Communication)

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