Otolith asymmetry as a proxy of thermal stress in cold water fish: do observations on natural populations of Cottus gobio meet experimental results?

Novak M., Abdoli A., Pont D., Sagnes P.

Published date: October 2013
Volume: 37
Number: 4
Pagination: 281–284
Publisher: Société Française d'Ichtyologie
doi: https://doi.org/10.26028/cybium/2013-374-007

An increase of water temperature due to global warming is expected to be stressful for many aquatic species such as cold-water fishes. Otolith asymmetry is known to be a proxy of fish stress. However, Cottus gobio Linnaeus, 1758 inhabiting potentially stressing (i.e. warm) thermal conditions did not present a higher level of asymmetry in their otoliths than other ones. Local adaptations to thermal stress of the different populations studied or a weak a priori definition of the thermal tolerance of this species are discussed.

Keywords: Cottidae - Cottus gobio - Fish stress - Fluctuating asymmetry - Global warming - Temperature
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