Continent of origin of Atlantic salmon (Salmo salar L.) at West Greenland
Scale samples collected from home waters in Europe and North America in 1982 and 1983 were used to determine if the 1980 database of Reddin (1986) could be used as a reliable basis for classifying fish caught in other years. These samples, when classified and compared with their known origin, indica...
| Published in: | ICES Journal of Marine Science |
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| Main Authors: | , , |
| Format: | Text |
| Language: | English |
| Published: |
Oxford University Press
1988
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| Subjects: | |
| Online Access: | http://icesjms.oxfordjournals.org/cgi/content/short/44/2/180 https://doi.org/10.1093/icesjms/44.2.180 |
| Summary: | Scale samples collected from home waters in Europe and North America in 1982 and 1983 were used to determine if the 1980 database of Reddin (1986) could be used as a reliable basis for classifying fish caught in other years. These samples, when classified and compared with their known origin, indicated misclassifications of only 6·6% and 4·6%, respectively. Small biases of 0·4% and 0·9%, respectively, were noted in favour of European salmon. This database of circuli counts of summer and winter areas of the first sea year, read in the anterior direction at 45° from the longitudinal axis of the scale, was used with discriminant analysis to classify salmon of unknown origin caught at West Greenland in 1982and 1983. The results indicated that the proportion of salmon of North American origin in samples from commercial catches at West Greenland in 1982 was 65 % (95 % C.L. = 69, 61), in research-vessel catches in 1982 it was 48 % (95 % C.L. = 54, 41), and in samples from commercial catches in 1983 it was 39% (95 % C.L. = 43, 35). Comparisons made to test for spatial and temporal trends showed no temporal trend, but differences were observed in the North American proportion between NAFO Divisions and between inshore and offshore areas. Des échantillons d'écailles recueillis en 1982 et 1983 dans les eaux d'origine d'Europe ct d'Amérique du Nord ont été utilisés pour vérifier la base de données discriminantes établie en 1980 par Reddin (1986). Les échantillons, classifiés et comparés en fonction de leur origine connue, ont montré une erreur de classification s'élevant seulemcnt à 6·6% et à 4·6% respectivement. De faibles déviations, respectivement de 0·4 % et de 0·9 %, en faveur des saumons européens, ont été notées. La présente base de données, composée du nombre de circuli dans les zones estivale et hivernale déposés pendant la première année en mer et dénombrés à 45° de I'axe longitudinal dans le secteur antérieur, a été utilisée pour classifier les saumons d'origine inconnue capturés au Groenlandde l'ouest en 1982 et ... |
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