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11-08-2010, 01:03 PM #1
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A history of identification to continent of origin of Atlantic salmon (Salmo salar L.
By David G. Reddin, Kevin D. Friedland
Fisheries Research, Volume 43, Issues 1-3, October 1999, Pages 221-235, ISSN 0165-7836, DOI: 10.1016/S0165-7836(99)00074-0.
Atlantic salmon caught in the commercial fishery at west Greenland have routinely been identified to continent of origin, viz., North American or European, since 1969, using scale pattern recognition techniques. Although specific details have varied over the 29-year period, the technique generally has remained the same. Discriminant analysis of scale samples collected in the commercial fishery (mixed samples) and a known origin database (training samples) collected in homewaters are used to identify the continental origin of individual fish. The proportions of North American salmon in the catch samples have ranged from a low of 34% in 1971 to a high of 75% in 1990. Comparisons of the North American proportions showed no consistent spatial trends, however, differences were noted in proportions with latitude along the west Greenland coast. The proportions of continent of origin, although varying annually, have generally shown an increasing proportion of North American salmon in recent years. Biological characteristics of individual salmon identified to continent of origin have been used in models to provide catch advice to managers for the west Greenland salmon fishery and to define the impacts of the fishery on salmon stocks.
Keywords: Salmon; West Greenland; Commercial fishery; Discriminant analysis