Synopsis
The toxicity of zinc to rainbow trout was determined and the 72 h median lethal concentration was found to be 2.00 mg l−1 in freshwater, hardness 7.50 mg l−1 as calcium. An insignificant increase in zinc concentration of internal tissues occurred in fish exposed to 1.52 mg l−1 in freshwater for 72 h. However, there was a significant uptake of zinc by gills and the body surface. Fish exposed to 10 mg l−1 zinc for 72 h in two-thirds sea water showed significant zinc uptake by liver, rectum and muscle, when compared to control fish. Drinking rate decreased from 1.43 to 0.26 ml kg−1 h−1 when zinc sulphate was added to freshwater. Trout adapted to two-thirds sea water showed no decrease in drinking, about 7 ml kg−1 h−1 when zinc was added to the water.
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Lovegrove, S.M., Eddy, B. Uptake and accumulation of zinc in juvenile rainbow trout, Salmo gairdneri . Environ Biol Fish 7, 285–289 (1982). https://doi.org/10.1007/BF00002503
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DOI: https://doi.org/10.1007/BF00002503