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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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Choice of angelfish as a function of the overall ratio of contour length of food items of the sets, when the numerically smaller set had a larger-sized food item and less overall contour length of the items than the larger set. Mean ± s.e.m. proportion of time (preference index) spent by test fish in the preference zone close to the smaller set containing a food item that doubled the size of the others. Values above 0.5 indicate a preference for the set with the larger-sized food item. No significant departure from the null hypothesis of no preference was found.