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. 2019 Nov 8;9:16307. doi: 10.1038/s41598-019-52592-w

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© The Author(s) 2019

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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WIK is less capable of swimming, and the motor trait is inherited to offspring. (a) The SL and CFL of PET, TL, AB, TU and WIK fish were measured. While PET and TL had a long fin (13~mm), AB, TU and WIK had a short fin (~9 mm). (b) The U_crit of five zebrafish strains were measured. (c) A graph showing the U_crit of five zebrafish strains and their offsprings. The U_crit of AB and TU were comparable. The U_crit of PET and TL strains were significantly lower than that of AB and TU. The U_crit of WIK strain was significantly lower than that of PET and TL. The TU/TU and TU/WIK offsprings showed normal swimming capability. The U_crit of WIK/WIK offspring was significantly lower than that of TU/TU and TU/WIK. Values are mean ± sem. The P values are calculated using Student’s t test. ^*P < 0.05; ^**P < 0.01; ^***P < 0.001; ns: not significant.