Figure 3
From: Size discrimination in adult zebrafish (Danio rerio): Normative data and individual variation

Housing and experimental tank of Experiment 2. A male and a female were housed in the two identical compartments (a and b) of the housing tank (A). The experimental tank (B) was a scaled-down version of the tank of Experiment 1 with an immature conspecific in each lateral compartment (c).