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. 2019 Jan 14;9:1889. doi: 10.3389/fphys.2018.01889

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Copyright © 2019 Palstra, Mendez, Dirks and Schaaf.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Experiment II: Exercise effects on size in wild-type and Gr mutant zebrafish. (A) Standard length (SL) and (B) body weight (BW) in wild-type zebrafish (green), and (C) SL and (D) BW of Gr mutant zebrafish (orange), at the start of the experiment (start), after 4 weeks without (non-ex) and with subjection to the daily exercise protocol swimming at the suboptimal (<Uopt), optimal, and super optimal (>Uopt) swimming speeds of 0.3, 0.4, and 0.5 m s^-1, respectively. Differences in letters mark significant differences (P < 0.05).