(4).The phenomenon, that feeding activity of R. verrucosus and R. aculeatus on dead-coral is higher than on sand, match as the point that food attract some fishes to intertidal zone at high tide.

• (4).；毒吻棘鲀、尖吻棘鲀在珊瑚礁岩的觅食时间较沙泥底区域长，符合潮间带鱼类在涨潮时返回潮间带是食物因子吸引的说法。