Figure 2
From: Artificial Light at Night Affects Emergence from a Refuge and Space Use in Guppies
Image of the experimental arena (88 × 88 cm) used for testing the effects of ALAN on guppy personality traits and memory ability. A guppy entered the T-shaped arena via the start box. The start box contained a piece of foam, which was removed at the start of a trial allowing fish access to the neutral zone. We placed landmarks (stones) in the corners of the neutral zone to help fish orient and distinguish between the left and right side. These landmarks were always positioned in the same way. From the neutral zone, fish could enter two choice arms, each of which contained a glass cubicle. One of the glass cubicles contained a shoal of four companion fish whereas the other one was empty.
