Researchers break new ground on oestrogenic effects in fish

The first British study of long-term concentrations of oestrogenic compounds in sewage effluent has found that they vary markedly over time - and suggests that efforts to optimise sewage treatment processes so as to reduce levels of natural oestrogens may lead to increased discharges of synthetic oestrogenic chemicals such as nonyl phenols. The research has also shown that the threshold at which oestrogenic effects occur in fish exposed to sewage effluent falls with time - casting doubt on the value of short-term tests in predicting acceptable levels of oestrogenic compounds in rivers. 1

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