Day trials commenced at 18:00 with five prawns being placed in the centre of each tank.
Lights were turned off at 19:00, and back on at 06:00, mimicking the natural light regime in April/May when the experiment was conducted.
Predators were added to the appropriate trials at 08:00, and the trial terminated at 18:00 (after 12 h of light) by placing a divider between habitats in each tank, removing any predators, and then thoroughly searching for and counting the number of prawns in each half of the tank.
Night trials followed a similar procedure, except they commenced at 08:00, lights went off at 21:00, predators were added at 22:00, and the trial terminated at 08:00 the following morning (after 11 h of darkness) before the lights were turned back on.
Prawns were held in spare tanks in the experimental rooms for at least 24 h prior to a they could adapt to a trial, so they could adapt to minor changes from the natural light regime.
Day trials commenced at 18:00 with five prawns being placed in the centre of each tank.Lights were turned off at 19:00, and back on at 06:00, mimicking the natural light regime in April/May when the experiment was conducted.Predators were added to the appropriate trials at 08:00, and the trial terminated at 18:00 (after 12 h of light) by placing a divider between habitats in each tank, removing any predators, and then thoroughly searching for and counting the number of prawns in each half of the tank.Night trials followed a similar procedure, except they commenced at 08:00, lights went off at 21:00, predators were added at 22:00, and the trial terminated at 08:00 the following morning (after 11 h of darkness) before the lights were turned back on.Prawns were held in spare tanks in the experimental rooms for at least 24 h prior to a they could adapt to a trial, so they could adapt to minor changes from the natural light regime.
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