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Updated: Feb 8, 2026

Coral Reef Arks: An In Situ Mesocosm and Toolkit for Assembling Reef Communities
Published on: January 6, 2023
Exposure to elevated carbon dioxide does not impair short-term swimming behaviour or shelter-seeking in a predatory
Graham D Raby1,2, Josefin Sundin3, Fredrik Jutfelt4
1Great Lakes Institute for Environmental Research, University of Windsor, Windsor, Canada.
Abstract:
Adult bluespotted rockcod Cephalopholis cyanostigma, a coral-reef grouper, were acclimated to either ambient (mean ± s.d. 406 ± 21 μatm; 1 atmos = 101325 Pa) or high pCO2 (945 ± 116 μatm) conditions in a laboratory for 8-9 days, then released at the water surface directly above a reef (depth c. 5 m) and followed on video camera (for 191 ± 21 s) by scuba divers until they sought cover in the reef. No differences were detected between groups in any of the six measured variables, which included the time fish spent immobile after release, tail beat frequency during swimming and the time required to locate and enter the protective shelter of the reef.
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