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<p>River defragmentation is essential to restore longitudinal connectivity and allow fish populations to access the full range of functional habitats they require. Yet, little is known about how individuals move and use habitats after a passage in a fishway. Over three consecutive years, we used manual radiotelemetry to track 31 individuals (21 barbel <i>Barbus barbus</i>, 10 chub <i>Squalius cephalus</i>) released upstream of two major barriers on the Amblève River (Belgium). Post-passage behaviour showed marked inter-individual variability, falling into three main profiles: long-term upstream residency, rapid downstream return, and upstream exploration before moving downstream an obstacle. Barbel exhibited larger home ranges (min = 0.5, max = 25.8, mean = 6.0&#xa0;km) than chub (min = 0.5, max = 4.3, mean = 1.7&#xa0;km), and were more likely to move downstream an obstacle (67% vs. 20%). Moving downstream of an obstacle increased significatively during the spawning period (estimate = 4.13, 95% CI 1.99–6.87) and with higher factor condition (estimate = 1.25, 95% CI 0.21–2.35), but significatively decreased with higher flow. High inter-individual variability suggests that movements are partly driven by intrinsic behavioural traits. These findings help understand river defragmentation advantages as a whole, by revealing what fish do once they have passed an obstacle.</p>

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What happens beyond the obstacle? Long-term fishway post-passage behaviour of potamodromous fish

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Justine Gelder,
  • Jean-Philippe Benitez,
  • Michaël Ovidio

摘要

River defragmentation is essential to restore longitudinal connectivity and allow fish populations to access the full range of functional habitats they require. Yet, little is known about how individuals move and use habitats after a passage in a fishway. Over three consecutive years, we used manual radiotelemetry to track 31 individuals (21 barbel Barbus barbus, 10 chub Squalius cephalus) released upstream of two major barriers on the Amblève River (Belgium). Post-passage behaviour showed marked inter-individual variability, falling into three main profiles: long-term upstream residency, rapid downstream return, and upstream exploration before moving downstream an obstacle. Barbel exhibited larger home ranges (min = 0.5, max = 25.8, mean = 6.0 km) than chub (min = 0.5, max = 4.3, mean = 1.7 km), and were more likely to move downstream an obstacle (67% vs. 20%). Moving downstream of an obstacle increased significatively during the spawning period (estimate = 4.13, 95% CI 1.99–6.87) and with higher factor condition (estimate = 1.25, 95% CI 0.21–2.35), but significatively decreased with higher flow. High inter-individual variability suggests that movements are partly driven by intrinsic behavioural traits. These findings help understand river defragmentation advantages as a whole, by revealing what fish do once they have passed an obstacle.