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We investigated the ability of embryonic clownfishes Amphiprion ephippium and A. rubrocinctus to detect sound during incubation in benthic nests. The heart rates of embryos within eggs were monitored as the young fish were exposed to sounds in the range of 100 to 1200 Hz at levels of 80 to 150 dB (re 1 μPa at 1 m) on each day of incubation. We found that, from 3 d after fertilisation, the heart rates of the embryos significantly increased when exposed to sound. As the embryos developed, a response in heart rate was found over a broader spectrum of sound (from 400 to 700 Hz at 3 d to a maximum of 100 to 1200 kHz at 9 d after fertilisation) and sensitivity also increased, with response threshold minima at 700 Hz dropping from 139.1 dB at 3 d to 88.3 dB at 9 d after fertilisation. We discuss these findings with respect to recent work that demonstrates the importance of sound as a settlement cue in coral reef fishes. © Inter-Research 2005.Natural Environment Research Council postgraduate fellowshipBritish AssociationInstitute of Museum and Library Service of the US Department of EducationNational Institute of Mental HealthNational Organization for Hearing ResearchKentucky Water Resources Research InstituteUniversity of Kentucky Research Committee grantAustralian Institute of Marine Science gran

Response of embryonic coral reef fishes (Pomacentridae: Amphiprion spp.) to noise