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Behaviours observed (A) in each of the five tank treatments (jar, small, medium, large, and large-barren), (B) across different times, (C) with and without a filter in the tank and (D) in the order in which fish were rotated into the tank. Each bar represents an average time spent displaying behaviours by the Siamese fighting fish (Betta splendens; n = 13) which completed the rotation between the five tank trials.
