2017

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Browsing 2017 by Subject "Cirrhinus mrigala, Ctenopharyngodon idella, copper, acute toxicity"

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    Determination of LC50 of Copper in Cirrhinus mrigala (Hamilton, 1822) and Ctenopharyngodon idella (Steindachner, 1866)
    (Society of Fisheries Technologists (India),COCHIN, 2017) Mamatha, C; Rao, L.M; Chakravarty, M.S
    Static bioassays were conducted on Cirrhinus mrigala (8±0.5g) and Ctenopharyngodon idella (8.5±1g) fingerlings, to determine the acute toxicity of copper. The experiments were designed as three replicates with five exposure groups arranged exponentially( 0.25, 0.75, 1.62, 3.25 and 6.62 mgl-1) for C. mrigala and five concentrations (0.5, 0.75, 1.62, 2.5 and 3.25 mgl-1) for C. idella, besides the controls. Each exposure group comprised of 10 fish each. The median lethal concentration (96-h LC50) of copper was determined as 0.74 mgl-1 Cu for C. mrigala and 3.07 mgl-1 Cu for C. idella respectively. Copper proved to be more toxic to C. mrigala than C. idella. The mortality rates increased with increasing copper concentrations, in both species