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New Zealand Journal of Marine and Freshwater Research abstractsCopper in the livers of trout caught below a sewage discharge (Note)I. L. VlDALWorks Department Laboratory, Wellington City Corporation, P.O. Box 2199, Wellington, New ZealandAbstract The range of copper concentrations in the livers of 21 brown trout Salmo trutta L. caught in a pool in the Wainuiomata River, Wellington, was 93-809 f-g.g1 by weight of wet tissue. This pool was 150 m below a sewage-treatment plant discharging into the river. The mean copper concentration in the livers of 11 of these trout caught in November-December 1976 was 505 Mg.g 1, and for the other 10 trout, caught in the same months in 1977, 312 Mg-g"1. Bottom fauna in the pool was dominated by the snails Physastra variabilis and Potamopyrgus antipodum, which were ingested by the trout. Copper concentrations for these snails in the pool and in upstream clean waters, the sewage and sewage solids, the silt and organic sediments of the pool, upstream clean water and the water of the pool, and mayflies and caddises which drift into the pool, are reported. Copper concentrations in the stomachs and intestines of 10 fish examined indicate that not all of the copper ingested is assimilated by the fish.
N.Z. Journal of Marine and Freshwater Research 12 (2): 217-19.
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