• Determination of acute toxicity levels of mercury to the fishTilapia mossambica (Peters)

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      https://www.ias.ac.in/article/fulltext/anml/092/05/0375-0380

    • Keywords

       

      Toxicity; mercury; safe concentrations; Tilapia rnossambica

    • Abstract

       

      Toxicity of inorganic mercury to the freshwater fishTilapia mossambica was demonstrated by static bioassays. Statistical analysis was used for calculating 48 hr median tolerance limit, 95% confidence limits and the slope function (S). No mortality was observed within 48 hr in mercuric chloride concentration of 0.7 mgl−1 although the swimming activity of the fish decreased and the rate of opercular movement increased significantly. Concentrations of 0.9 mgl−1 and higher proved lethal. Symptoms of mercury poisoning and safe concentrations of mercury have been discussed.

    • Author Affiliations

       

      Maria R Menezes1 S Z Qasim2

      1. National Institute of Oceanography, Dona Paula, Goa - 403 004, India
      2. Department of Ocean Development, South Block, New Delhi - 110 001, India
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