Abstract :
[en] The European eel Anguilla anguilla is a critically endangered fish species as a result
of human activities and climate change in river and oceanic ecosystems. Restocking
using glass eels in continental freshwater areas is a potential conservation measure
for enhancing local eel stocks and for conserving the species in aquatic habitats,
where it may otherwise disappear. However, little is known about the fate of these
restocked individuals and the early ecological behaviour of the young eels
translocated in rivers.A portable radio‐frequency identification (RFID) telemetry system and 12‐mm tags
were used to track restocked eels for a duration of 4 years. The aim was to understand
the early movement, behavioural traits, dispersal, and habitat use of elvers
after restocking performed in 2013 with glass eels in a shallow riverine
environment.From the 241 tagged eels (total length, Q50 = 152 mm), 85% were detected in 1968
positions during a period of 4 years, beginning in 2014. Clear seasonality in eel
activity was observed, with higher mobility in summer when the water temperature
was high (above 12°C). Dispersal was slowed by numerous artificial obstacles and
the high carrying capacity of habitats. There was a negative relationship between
the body size of eels at tagging and their mobility. Five behavioural categories of
mobility patterns were identified: ascending, descending, oscillating with an
upstream trend, oscillating with a downstream trend, and stationary. The first four
categories depleted with time, in favour of stationary individuals that displayed a
highly sedentary lifestyle.This study provides new knowledge of the long‐term dispersal behaviour of
restocked eels and the influence of seasons, barriers, and habitats on their
colonization strategy changing with time. The results contribute to a better
understanding of the issue of uncommon restocking practices in upland rivers.
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