Pilot study to investigate the effect of long-term exposure to high pCO₂ on adult cod (Gadus morhua) otolith morphology and calcium carbonate deposition.

ABSTRACT: To date the study of ocean acidification on fish otolith formation has been mainly focused on larval and juvenile stages. In the present pilot study, wild-captured adult Atlantic cod (Gadus morhua) were exposed to two different levels of pCO_2, 422µatm (ambient, low pCO₂) or 1091µatm (high pCO₂), for a period of 30 weeks (from mid-October to early April 2014-2015) in order to study the effects on otolith size, shape and CaCO₃ crystallization amongst other biological parameters. We found that otoliths from cod exposed to high pCO₂ were slightly smaller (- 3.4% in length; - 3.3% in perimeter), rounder (- 2.9% circularity and + 4% roundness) but heavier (+ 5%) than the low pCO₂ group. Interestingly, there were different effects

SUBMITTER: Coll-Llado C 

PROVIDER: S-EPMC8636414 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature