Are we heading towards a global decrease in coregonine catches?
Journal
International Journal of Limnology
Journal Volume
61
Start Page
Article number 6
ISSN
2823-1465
Date Issued
2025-05-07
Author(s)
Orlane Anneville
Benjamin Alric
Jan Baer
Fabien Bourinet
Alexander Brinker
David B. Bunnell
Chloé Goulon
Kerstin Holmgren
Yamin Janjua
Yu-Chun Kao
Külli Kangur
Alfred Sandström
Eugene A. Silow
Xinhua Zhu
Abstract
Coregonines have specific ecological needs, making them potentially very vulnerable to changes in lake conditions. A contemporary concern is that many lakes worldwide are experiencing environmental changes due to anthropogenic pressure and climate warming. Here, we compiled long-term data of coregonine catches from 27 lakes from three continents in the northern hemisphere. Declines in catch were observed in 67% of the lakes during the first two decades of the 21st century, with a significant trend (p-value<0.05) in 44% of the cases. An analysis to determine whether trends are globally linked to environmental conditions and specific lake attributes was carried out on 26 lakes for the period 2000-2019. Several local declines in catches had already been documented in the literature and are likely to be due to local forcing such as nutrients, species invasions and changes in fishing practices. Nevertheless, on a global scale, our results indicate that lakes, which exhibited a significant decrease in catch were larger and more nutrient-poor than other lakes. The rate of change in catches appeared to be related to the trophic state of the lake. The specific effect of warming is difficult to determine during the studied period. When warming occurred outside the period of egg incubation, decreasing trends were more frequently observed in nutrient-poor than in mesotrophic lakes. In conclusion, our findings suggest that achieving oligo- or ultraoligotrophic conditions, as required in developed countries to control phytoplankton blooms and enhance water quality, could pose significant challenges for future management of coregonine fisheries.
Subjects
Fisheries
Global warming
Long-term catch data
Re-oligotrophication
Water quality
Publisher
EDP Sciences
Type
journal article