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11-08-2010, 02:52 PM #1
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Recent changes in Atlantic Salmon (Salmo salar runs in the light of environmental cha
By C.Leslie Dominy
Biological Conservation, Volume 5, Issue 2, April 1973, Pages 105-113, ISSN 0006-3207, DOI: 10.1016/0006-3207(73)90087-6.
Deterioration of water quality as a result of the disposal of untreated organic and toxic wastes into the Saint John River Basin began when the River was first settled in 1604, and the amount of waste entering the River has increased substantially over the past two decades. Hydroelectric power developments constructed on the main stem of the River during this recent period have added to the problem by reducing the biological assimilative capacity of the River. The significance of these cultural influences for Atlantic Salmon (Salmo salar) in the River has been to reduce the quality of its migration route to and from the sea, to eliminate some of its freshwater spawning and rearing areas, and to cause direct mortality of adult and juvenile Salmon. As a consequence, the total Salmon stock in the Saint John River has declined by approximately 40 per cent over the past two decades. The future prospects for conserving this valuable natural resource in the Saint John River are moderately bright in view of current activities in water pollution abatement, effective regulation of the Salmon fisheries, and large-scale artificial propagation.