Returns of three year-classes of sea-ranched Atlantic salmon of various river strains and strain crosses |
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| Authors: | John K Bailey Richard L Saunders |
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| Institution: | Salmon Genetics Research Program, North American Salmon Research Center, St. Andrews, N.B. EOG 2X0 Canada |
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| Abstract: | Releases and returns of three year-classes of sea-ranched Atlantic salmon, Salmo salar, of several river strains and strain crosses were examined. Significant (P < 0.05) year-class and strain effects were found for fork length, day of return, and percent return among grilse and larger salmon and for the percentage of grilse among the returns. In addition, contrasts among pure strains, sire strains, and dam strains were made. Grilse of the Big Salmon River strain and crosses involving the Big Salmon River strain tended to be longest, return latest, and had the highest percent returns. Larger salmon of the Saint John River strain and strain crosses tended to be longest and had the highest percent return. The Big Salmon River and Rocky Brook strains produced higher proportions of grilse than either the Magaguadavic or Saint John River strains. There was no evidence of heterosis from crosses between strains for any of the traits examined. Sire strain means were more similar to pure strain means than were dam strain means. Pseudolinkage in the males is proposed as a possible explanation. Recommendations are made for choosing stocks which are appropriate for sea ranching. |
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