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. 2021 Sep 28;47(6):1879–1891. doi: 10.1007/s10695-021-01016-6

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Adjusted means for otolith measurements and shape indexes from Atlantic cod exposed to 1091 (high pCO₂) and 422µatm (low pCO₂) for a period of 30 weeks. Values are expressed as adjusted mean ± SE for 422 (low pCO₂; N = 81) (green) and 1091µatm (high pCO₂; N = 98) (red) groups. Asterisks indicate significant differences between treatments (*P < 0.05). Otolith length (OL) (A), otolith width (OR) (B), otolith area (OA) (C), otolith perimeter (OP) (D), otolith weight (OW) (E), otolith density (OD) (F), circularity (Cicl) (G), rectangularity (Rect) (H), roundness (Rd) (I) and ellipticity (Ellip) (J)