![]() Increment_1_river - scale increment of 1st freshwater annual growth zone (accuracy ± 0.01 μm) MethodsĪge_river - number of winters spent in the freshwaterĪge_sea - number of winters spent in the sea This knowledge identifies possible threats in management actions for sea trout with an emphasis on ongoing climate change. Therefore, wild sea trout might be better suited to changing environmental conditions than hatchery-reared sea trout. Additionally, wild sea trout are characterized by stronger responses to temperature variability and higher phenotypic plasticity of growth than those of the hatchery-reared individuals. We observed stronger relationships between fish growth and temperature conditions in the marine phase than in the freshwater phase. Temperature positively affects fish growth, regardless of the origin of the fish. Furthermore, we developed indices of interannual (2003–2015) growth variation in the marine and freshwater phases of the life cycle of the fish and analyzed the relationships between trout growth and temperature. We used mixed-effects Bayesian modeling and ascribed the variances in growth to different sources. We analyzed the scale increment widths as a proxy of somatic growth and investigated the interannual variabilities and differences in growth between fish groups (wild and hatchery-reared). Scales were collected from sea trout in a selected river flowing into the southern Baltic Sea. The aim of this work was to investigate the growth responses of sea trout to changing temperature conditions and to compare the growth plasticity between wild and hatchery-reared fish. (the sea trout) juveniles are released into the natural environment in the Atlantic region. Each year, millions of hatchery-reared sea-run brown trout Salmo trutta L.
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