Effect of temperature and CO2 concentration on the morphogenesis of sagittal otoliths in Atlantic herring (Clupea harengus) larvae

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Mahé, Kelig | Joly, Lea | Telliez, Solene | Zambonino Infante, Jose-Luis | Meunier Cédric, Léo | Mackenzie, Kirsteen | Giraldo, Carolina

Edité par CCSD ; Elsevier -

International audience. Otoliths are very useful biomarkers especially for fish growth. Climate change with the associated global changesin warming and acidification could affect the calcification and the shape of otoliths during the crucial larvalperiod in teleost fish. To evaluate this predicted combined effect of temperature and CO2, Atlantic herring(Clupea harengus) embryos and larvae were reared from hatching to respectively 47 and 60 days post-hatching(dph), under present day conditions and a scenario predicted for the year 2100 (IPCC RCP8.5). Otolithmorphogenesis was tracked by analyzing area and normalized Elliptical Fourier coefficients. We found thatotolith area for fish of similar size increased under the predicted 2100 climate change scenario compared to thepresent day. Climate change does not, however, seem to directly affect the otolith shape. Finally, the onset ofotolith morphogenesis is hardwired, but the relationship between otolith and fish size is environment-dependent.

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