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Research article2023Peer reviewedOpen access

Insights from the early generations of the Swedish rainbow trout (Oncorhynchus mykiss) breeding program

Kurta, Khrystyna; Jeuthe, Henrik; de Koning, Dirk-Jan; Palaiokostas, Christos


This study aimed to gain insights about the status of the Swedish breeding program through studying key phenotypic traits. In total, 133 and 73 full-sib families were formed during the reproductive seasons of 2016 and 2019, respectively. Growth-related recordings were available from two occasions: & SIM; 9 and 24-27 months post-hatch. A preliminary descriptive analysis of the fecundity and early embryo survival identified substantial differences in favor of G0 (year class 2016) which was partly explained by the fact that first-time 3-year-old spawners were used in G1 (year class 2019). Moderate to high heritability values (0.23-0.49) were obtained for body length and weight across both time points and generations. Furthermore, the prediction accuracy of the estimated breeding values was & SIM;0.65, while the expected genetic gain was 36 g per year. Overall, our results demonstrate the positive performance of the Swedish rainbow trout breeding program.


Rainbow trout; selective breeding; BLUP; genetic parameter estimation;

Published in

Acta Agriculturae Scandinavica, Section A - Animal Science
2023, Volume: 72, number: 3-4, pages: 88-99