Investigating the phenology of juvenile potamodromous brown trout (Salmo trutta L.) in two large lake catchments
Date
2022-01-05
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley
Abstract
There is growing interest in the phenology of juvenile Salmo trutta and evidence of
significant downstream migration during the autumn in some anadromous
populations. The present study used acoustic telemetry to examine the phenology of
potamodromous trout parr across a region encompassing two large lake catchments.
One hundred sixty-seven trout parr were tagged in late summer across four lake tributaries
between 2018 and 2020. In total, 75 tagged parr migrated into the lakes with
67 (89%) migrating between September and December and 8 (11%) migrating
between March and June. Autumn migration was highly prevalent across all the
tributaries, with 16%–66% of each tagged sample exhibiting autumn migration, and
0%–15% of each tagged sample exhibiting spring migration. Autumn migrants were
significantly longer and heavier than spring migrants, but condition factor was similar.
Autumn migrants were associated with higher river discharge levels and lower water
temperatures than spring migrants. The management challenges posed by extensive
autumn migration behaviour in migratory trout stocks are examined and discussed.
Description
Publication history: Accepted - 21 December 2021; Published online - 5 January 2022.
item.page.type
Article
item.page.format
Keywords
acoustic telemetry, migration,, run-timing, salmonids
Citation
Kennedy, R.J., Rosell, R. and Allen, M. (2022) ‘Investigating the phenology of juvenile potamodromous brown trout (salmo trutta l. ) in two large lake catchments’, Journal of Fish Biology. Wiley. doi:10.1111/jfb.14982.