Determination of LC50 of Copper in Cirrhinus mrigala (Hamilton, 1822) and Ctenopharyngodon idella (Steindachner, 1866)
Determination of LC50 of Copper in Cirrhinus mrigala (Hamilton, 1822) and Ctenopharyngodon idella (Steindachner, 1866)
Date
2017
Authors
Mamatha, C
Rao, L.M
Chakravarty, M.S
Journal Title
Journal ISSN
Volume Title
Publisher
Society of Fisheries Technologists (India),COCHIN
Abstract
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
Description
Keywords
Cirrhinus mrigala, Ctenopharyngodon idella, copper, acute toxicity
Citation
Fishery Tech.54 (4) :237-243