. Cottage country : an environmental manual for cottagers. Cottages; Vacation homes; Environmental protection; Pollution. The central nervous system is most atfectcd by methylmereiiry. Some signs ot poisoning include lack of co-ordination, the feeling of "pins and needles," numbness of the lips and mouth, constricted visual field, niglit blindness, tremors, deaf- ness and diminished taste and smell. At the extreme, mercury poisoning may result in death. It should be pointed out that many symptoms listed above are common to other ailments not associated with mercury. Extensive medical
. Cottage country : an environmental manual for cottagers. Cottages; Vacation homes; Environmental protection; Pollution. The central nervous system is most atfectcd by methylmereiiry. Some signs ot poisoning include lack of co-ordination, the feeling of "pins and needles," numbness of the lips and mouth, constricted visual field, niglit blindness, tremors, deaf- ness and diminished taste and smell. At the extreme, mercury poisoning may result in death. It should be pointed out that many symptoms listed above are common to other ailments not associated with mercury. Extensive medical testing is required to confirm mercury poisoning. The consumption guidelines de- veloped for use by Ontario's anglers are based on federal guidelines supplemented by recommendations prepared by the World Health Organization. Consumers following the guidelines can be assured that mer- cury levels in their bodies will remain far below levels where poisoning symptoms begin to appear. The guidelines were developed for adults and, since the mercury level within the body is directly related to body weiglit, extra caution must be taken to protect a child or a fetus. It is therefore recommended that children under IS and women of child-bearing age should consume only fish with a mercury content of less than parts per million (ppni), the federal guideline for commercially marketed fish. Polychlorinated Biphenyls (PCBs) PCBs are a group of chlorinated or- ganic compounds developed in the 1920s. These chemicals are not formed in the natural environment so their presence in fish can always be at- tributed to human activities. PCBs are very stable; they do not easily break down chemically or natur- ally, and burn only at extremely high temperatures. These properties led to widespread use of PCBs in transformer fluids, hy- draulic fluids, oils, greases, fire retar- dants, and plasticizers in such prod- ucts as paints, inks and adhesives. PCBs are of human health concern because of two t
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