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Fig. 1. Diagrammatic representation of the observation tank. Fine sewing thread was
placed on the outside of each tank to indicate the tank midline (dotted line).
A fish scored one midline crossing each time its head (from snout to end of
operculum) passed the midline. Tanks also contained a shelter and air stone
and a point of introduction for food and alarm substance. Diagram not to
scale.
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