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. 2020 Apr 3;10:5913. doi: 10.1038/s41598-020-62699-0

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© The Author(s) 2020

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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Changes in swimming behavior in black-white preference test. (A) Apparatus used in the black-white preference test. (B) Tracking of zebrafish swimming behaviour. (C,D) swimming velocities in the white area (C) and the black area (D). (E) Total time spent stationary (frozen). Black and grey colour indicate time of freezing in the black and white area, respectively. (F) Details of swimming behaviour in the tested period. Grey, white, and black colour indicate freezing, swimming in the white area, and the black area, respectively. (G) Total distance travelled. (H) Total number of entries into the white area. (I) Number of entries into the white area/swimming distance (m). N = 15. n.s., not significant. Columns having the same letter were not statistically different, vice versa.