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Man-made, physical barriers have disrupted longitudinal connectivity for migratory fish in many river systems throughout the world for centuries. These barriers are considered to be a key reason for the decline of many fish species in river systems. To date, most research to ease movement of anadromous salmonids past such barriers to help dwindling populations has focused on the use of technical fishways...
Complementary data on survival and movement are often missing for early life stages that are logistically challenging to track.
Previous studies observed significant declines in the density of age‐0 brown trout between summer and autumn in tributaries of Lake Geneva, but the cause of these declines was unknown. We hypothesised that mortality, dispersal within tributaries, early emigration to the lake...
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