In order to bridge the gap between field and laboratory observations concerning the effect of nutrient enrichment under high seawater temperature, further laboratory experiments under controlled conditions are required. The purpose of the present study was to investigate whether the loss rate of coral symbiotic algae due to high seawater temperature is directly affected by nutrient enrichment. Corals were first cultured at a normal temperature (27 °C) in either nutrient-depleted or nutrient-enriched seawater from the perspective of in situ nutrient gradients, e.g., from inshore to offshore (Chauvin et al., 2011, Sawall et al., 2011 and Tanaka et al., 2011).