On the North Thompson River of British Columbia, Canada, sperm banks are being employed to preserve salmon species. Proposed water diversion on the Nechako River, in British Columbia, may threaten the internationally important Fraser River fishery.
Little emphasis is placed on the effects of pollution of water by toxic substances such as fluoride.
The aluminum industry is the chief beneficiary of power dams on the Columbia River System, and it is the fluoride wastes from smelters that first come to mind as sources of fluoride pollution. However, there is another potential source of contamination - the artificial fluoridation of community water supplies for the avowed purpose of improving dental health. This study examines the possibility that artificial fluoridation of drinking water in communities along the course of salmon rivers is a factor to be included. There are studies showing the effect of temperature and hardness. The average daily discharge of fluoride in 1982 was 384 kg.