Abstract: Behavior and aggregation of satiated，fasted and refed sea urchin Strongylocentrotus nudus were investigated in reefs prepared by two types of PVC under simulated water current and illumination at seafloor.The results showed that 90％of sea urchin evenly distributed was found to move near to the reef zone at light intensity of 560 lx，and flow velocity of 20 cm/s（9：00），while theymoved outoff the reefs at the declining light intensity and water velocity.The sea urchin hadmovement speed of0.052 cm/s，0.039 cm/s and 0.041 cm/swhen theywere satiated，fasted and refed，respectively，with the movement frequency ratio of along water to againstwater in the three states was described as：fasted（1.63）＞satiation（1.18）＞refed after fasted（0.73），indicating that refeeding after fasted led to higher activity than at satiation and fast.Also，the reefmaterial influenced the aggregation behavior of sea urchin.An average aggregation rate of25％，17％and 24％to the cement reefswas observed in the sea urchin which was satiated，fasted and refed，respectively，and there was average aggregation rate of 16％，7％and 12％ to the PVC reefs in the sea urchin which was satiated，fasted and refed，respectively，showing the descendantorder of aggregation rate as satiation＞feeding after fast＞fast.The findings indicate that better aggregation rate was found in the satiated and refed sea urchin，and that there was better aggregation rate in the cement reefs than that in the PVC reefs.
杨军, 刘永虎, 田涛, 张国胜, 陈勇, 尹增强, 王月, 陈辰. 模拟海底水流和光照条件下光棘球海胆行为特征及其聚礁效果的初步研究[J]. 大连海洋大学学报, 2016, 31(2): 219-224.
YANG Jun, LIU Yong-hu, TIAN Tao, ZHANG Guo-sheng, CHEN Yong, YIN Zeng-qiang, WANG Yue, CHEN Chen. Behavior and aggregation of sea urchin Strongylocentrotus nudus to reefs under the simulated water current and illum ination at seafloor. Journal of Dalian Ocean University, 2016, 31(2): 219-224.
2016, Vol. 31 
