珊瑚礁需要魚群幫忙保養來維持健康。為拯救瀕死的珊瑚礁，有生物學家嘗試用水底擴音機播放健康珊瑚礁的聲音(魚群、蝦等發出的聲響)，成功吸引比一般多50%的幼魚，來幫忙清除壞掉的部分，提升珊瑚礁復原的機會。

coral reef needs fish to maintain a healthy ecosystem. To safe dying coral reef, a marine biologist used an underwater speaker to play sounds of healthy coral reefs including noises made by fish and shrimps; these noises attracted twice as many young fish to help cleaning patches of dead coral to make room for new ones to grown, hoping to increase the chance for the coral reef to recover.

http://www.natureworldnews.com/articles/42794/20191130/dying-coral-reef-revived-playing-sounds-healthy-reefs.htm