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Selection experiments with salmon part 2 proportion of atlantic salmon smoltifying at 1 year of age


Selection experiments with salmon part 2 proportion of atlantic salmon smoltifying at 1 year of age



Aquaculture 10(3): 231-242



ISSN/ISBN: 0044-8486

DOI: 10.1016/0044-8486(77)90004-7

Salmon (Salmo salar) brood stock were taken from 37 localities in Norway for 4 consecutive years. Each year, after fertilization, the offspring in each family from each strain were reared in separate egg trays and fingerling tanks. The percentage of fish in each tank which smoltified at 1 yr old was recorded, and environmental and genetic factors influencing the percentage smoltification were studied. Percentage smoltification was significantly affected by the number of fish held in a tank, or fish density (correlation coefficient 0.03-0.27). Variation between locality of origin of brood stock and per cent smoltification was highly significant for each year class, and there was a high correlation (0.89-0.95) between smolt percentage and average weight of fish in a family. Heritabilities in per cent smoltification estimated by sire component from total data had a weighted average of 0.06 (range 0.16 to -0.01). From the dam component heritabilities ranged from 0.20-0.40 when tank effect was ignored, and 0.08-0.25 with tank effect taken into account. Variance components for locality were 2-3 times as high as those for sires within localities, indicating that genetic variation is greater between than within localities. Highly significant interaction sire .times. dam was found, suggesting a considerable nonadditive genetic variance influencing the percentage of fish smoltifying at 1 yr of age.

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Accession: 006380371

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