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. 2019 Oct 25;9:15305. doi: 10.1038/s41598-019-51753-1

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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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Schematic representation of the experimental aquarium including partitions and panels. (a) Side view showing the main partitions (transparent and white opaque), with the guillotine windows, that delimited the compartments. The transparent plastic divider that delimited the preference zones and the panels where the stimuli were presented are also indicated. P: refers to the panels that the experimenter could raise or lower to open or close the guillotine windows. (b) Top view showing the home and test compartments separated by a smaller middle compartment whose central part constituted the start box. The middle compartment is represented devoid of sand (although it had it) for greater clarity. The preference zones are also indicated (dashed line).