Average percentage of extended polyps during the 2012 and 2013 visual impact studies. A) Average percentage of extended polyps in the 2012 visual impact study. After 96 hours the colonies were transferred to artificial seawater for recovery; 136 hours marks the end of the recovery period (shaded panel). B) Average percentage of extended polyps in the 2013 visual impact study; there was no recovery period. Black = red corals, grey = white corals, error bars = standard deviation. DOI: https://doi.org/10.1525/elementa.261.f4