. Cottage country : an environmental manual for cottagers. Cottages; Vacation homes; Environmental protection; Pollution. CHAPTER VI Which Sport Fish to Eat? Fish in many parts i)t the world have been affected by industrial or natural contaminants. In Ontario, the metal mercur) has been tlie principal trace contaminant aftecting fish. The gov- ernment's continuous testing program has also detected such compounds as polychlorinated biphenyls (PCBs), mirex and DDT in some fish from some water bodies. We're all con- cerned about tliis because prolonged consumption of contaminated fish could lead
. Cottage country : an environmental manual for cottagers. Cottages; Vacation homes; Environmental protection; Pollution. CHAPTER VI Which Sport Fish to Eat? Fish in many parts i)t the world have been affected by industrial or natural contaminants. In Ontario, the metal mercur) has been tlie principal trace contaminant aftecting fish. The gov- ernment's continuous testing program has also detected such compounds as polychlorinated biphenyls (PCBs), mirex and DDT in some fish from some water bodies. We're all con- cerned about tliis because prolonged consumption of contaminated fish could lead to health problems. These contaminants, however, have never been detected in water in suffi- cient quantities to make any Ontario lakes or rivers unfit for swimming or as a source of treated drinking water Thousands of Ontario's lakes and rivers have fish that are free from sig- nificant contamination. Others con- tain fish that are contaminated to some degree and may be consumed occasionally Fish from some lakes contain enough contaminants to make them unsuitable tor consumption. Usually these are the larger, more ma- ture fish that have accumulated the contaminant over manv vears. The Contaminants of Concern The contaminants detected in Ontario sport fish that can cause health prob- lems arc mercur\. PCBs. dioxin, mirex and DDT Other substances, such as lead, arsenic and cadmium, are also being monitored, but concentrations found to date indicate that these do not pose a hazard. Fish containing mercury, PCBs dioxin, mirex or DDT show no out- ward effects, and only modern labora- tory techniques can determine levels of Mercury Mercury is a naturally occurring metallic element familiar to people through its widespread use in ther- mometers. It is found in low concen- trations in most rocks and soils and is particularly abundant in some areas of the Precambrian Shield. Natural deposits are thought to re- sult in elevated levels of mercury in fish in areas far rem
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