Many sounds produced by fishes remain to be described. Understanding sound production for vocal species would permit the development of passive acoustic monitoring of fish diversity. The present study investigated sound production in the glassy sweeper Pempheris schomburgkii in Guadeloupe reefs, French West Indies. Two recording approaches were used: passive acoustic monitoring in the wild and active recordings with hand-held individuals in captivity. Calls consisted of series of harmonic pop sounds with a dominant frequency of 360 Hz. On coral reefs, they were produced in chorus, starting after sunset and lasting up to 3 h. Sounds recorded in situ were longer with more pulses than sounds recorded from captive specimens. These differences in temporal features suggest two types of sounds: acoustic signals that act as distress calls and those that might be involved in group-level activities such as group cohesion and reproduction. A morphological study was also performed to describe the anatomy of the sound production apparatus which consisted of a pair of large sonic muscles which inserted dorsally on a contractible anterior part of the swim bladder. Contractions of these muscles extend rostrally this part of the swim bladder while an inner sheet of elastic connective tissue acts as a recoiling system to help the swim bladder recover its initial position during relaxation of the sonic muscles. The present results, therefore, contribute to the description of sound production by fishes found in an underexplored region and further illustrate how passive acoustics may be used to monitor fish populations in the future.

鱼产生的许多声音仍有待描述。了解声音物种的声音产生将允许对鱼类多样性进行被动声学监测。本研究调查了玻璃状清扫车Pempheris schomburgkii中的声音产生在法属西印度群岛瓜德罗普岛的珊瑚礁中。使用了两种记录方法：在野外进行被动声监测和在被囚禁的手持人员的情况下进行主动记录。通话由一系列主频为360 Hz的谐波流行声组成。在珊瑚礁上，它们以合唱形式产生，从日落之后开始，持续长达3小时。原地录制的声音比自留标本录制的声音更长，脉冲更长。时间特征的这些差异提示了两种类型的声音：充当遇险呼叫的声音信号以及可能参与诸如团体凝聚力和再现之类的团体活动的声音信号。还进行了形态学研究，以描述发声装置的解剖结构，该发声装置由一对大的声肌组成，该声肌背侧插入在游泳膀胱的可收缩前部。这些肌肉的收缩在游泳膀胱的此部分向后延伸，而弹性结缔组织的内层则充当回缩系统，以帮助游泳膀胱在声波肌肉放松期间恢复其初始位置。因此，目前的结果有助于描述在勘探不足地区发现的鱼类产生的声音，并进一步说明了将来如何使用无源声学来监测鱼类种群。这些肌肉的收缩在游泳膀胱的此部分向后延伸，而弹性结缔组织的内层则充当回缩系统，以帮助游泳膀胱在声波肌肉放松期间恢复其初始位置。因此，目前的结果有助于描述在勘探不足地区发现的鱼类产生的声音，并进一步说明了将来如何使用无源声学来监测鱼类种群。这些肌肉的收缩在游泳膀胱的此部分向后延伸，而弹性结缔组织的内层则充当回缩系统，以帮助游泳膀胱在声波肌肉放松期间恢复其初始位置。因此，目前的结果有助于描述在勘探不足地区发现的鱼类产生的声音，并进一步说明了将来如何使用无源声学来监测鱼类种群。