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Place-preference test, 15-min trial (n = 10 per group; mean ± 1 SD). (A) Numbers of transitions to the plant- and fish-containing compartments. (B) Time spent in compartments containing an artificial plant or 3 conspecifics. *, Significant differences determined by using the Kruskal–Wallis test (P < 0.05) followed by a Bonferroni test (P < 0.05).
