. Cottage country : an environmental manual for cottagers. Cottages; Vacation homes; Environmental protection; Pollution. DDT DDT was developed during the Sec- ond World War to control a wide vari- ety' of insects. Afterwards, it gained widespread use as an insecticide for agricultural and public health use. DDT is also not easih broken down in the natural environment Tlie ac- cumulation of DDT in fish caused mar- kedly reduced reproductive capability in a number of species and led to re- strictions on its use in the mid-1960s. In 1969. the Ontario Pesticides Act li- mited its use to very spec
. Cottage country : an environmental manual for cottagers. Cottages; Vacation homes; Environmental protection; Pollution. DDT DDT was developed during the Sec- ond World War to control a wide vari- ety' of insects. Afterwards, it gained widespread use as an insecticide for agricultural and public health use. DDT is also not easih broken down in the natural environment Tlie ac- cumulation of DDT in fish caused mar- kedly reduced reproductive capability in a number of species and led to re- strictions on its use in the mid-1960s. In 1969. the Ontario Pesticides Act li- mited its use to very specific purposes by special permit only. No permits have been issued this year. As a result of these actions, there have been substantial reductions of DDT levels in fish. Therefore, there are now no restrictions on the consump- tion of Ontario sport fish due to DDT Dioxin Dioxins are a group of "5 chemicals of the chlorodibenzodioxin family. One compound, 2, ;. 8-TCDD (tet- rachlorodibenzodioxin), is extremely toxic. At low doses 2, 3, ^. 8-TCDD has been shown to be carcinogenic and to affect reproduction in laboratory ani- mals; it is therefore considered to have the potential to cause similar effects in humans. Dioxins are not useful manufac- tured chemical compounds, 2, 3,". 8- TCDD, for example, is a trace by-prod- uct of the manufacture of 2, -i, 5- trichlorophenol and may therefore be found in very small amounts in that chemical, its manufacturing wastes and in chemicals manufactured from it, such as the herbicide 2,4, 5-T. Dioxin can be emitted from com- bustion sources. Ontario's Fish Contaminant Monitoring Program Since the mid- I96()s. when DDT was first measured in fish, Ontario has completed an extensi\e monitoring program. During 1969 and the early I9"0s, intensi\e sampling for mercury in fish was undertaken in the Hnglish- Wabigoon system of northwestern On- tario and the St. Vhir River-Lake St. Clair system (of the dreat Lakes) in southwestern
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Keywords: ., bookcentury1900, booksubjectcottages, booksubjectenvironmentalpr
