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Sound characteristics and the sound producing system in silver sweeper, Pempheris schwenkii (Perciformes: Pempheridae)
Takayama, M.; Onuki, A.; Yosino, T.; Yoshimoto, M.; Ito, H.; Kohbara, J.; Somiya, H. (2003). Sound characteristics and the sound producing system in silver sweeper, Pempheris schwenkii (Perciformes: Pempheridae). J. Mar. Biol. Ass. U.K. 83(6): 1317-1320
In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154, more
Peer reviewed article  

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Authors  Top 
  • Takayama, M.
  • Onuki, A.
  • Yosino, T.
  • Yoshimoto, M.
  • Ito, H.
  • Kohbara, J.
  • Somiya, H.

Abstract
    The sound characteristics and the sound producing system in silver sweeper, Pempheris schwenkii, are described. The main frequency component of the emitted sounds was 100-300 Hz, the mean duration of the sounds being 56 ms. The sounds were produced by paired extrinsic sonic muscles vibrating the swimbladder. The sonic muscles originated on the pterotic bones and extended to the anterodorsal surface of the swimbladder, and were innervated by two branches of the occipital nerves. Moreover significant sexual dimorphism of the sonic muscles was observed, those in males being three times as large as in females.

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