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. Author manuscript; available in PMC: 2016 May 1.
Published in final edited form as: Anim Behav. 2015 Feb 24;103:259–265. doi: 10.1016/j.anbehav.2015.01.019

Figure 2.

Figure 2

Front view of the aquarium (45 litres) divided in half with a watertight, clear divider (grey midline) and a removable opaque barrier (black midline). There is a small male fish (left compartment) and a large male fish (~4× larger; right compartment). The half terra-cotta pot was cut so that both fish ‘shared’ the same shelter, although they were not aware of each other’s presence. This ‘shared’ shelter was hemi-sected by both centre dividers. A layer of gravel covered the bottom of the tank.