Depth-dependent swimbladder compression in herring Clupea harengus observed using magnetic resonance imaging

S. M. M. Faessler, P. G. Fernandes, S. I. K. Semple, A. S. Brierley

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Abstract

Changes in swimbladder morphology in an Atlantic herring Clupea harengus with pressure were examined by magnetic resonance imaging of a dead fish in a purpose-built pressure chamber. Swimbladder volume changed with pressure according to Boyle's Law, but compression in the lateral aspect was greater than in the dorsal aspect. This uneven compression has a reduced effect on acoustic backscattering than symmetrical compression and would elicit less pronounced effects of depth on acoustic biomass estimates of C. harengus.

Original languageEnglish
Pages (from-to)296-303
Number of pages8
JournalJournal of Fish Biology
Volume74
Issue number1
DOIs
Publication statusPublished - Jan 2009

Keywords

  • acoustic surveys
  • Boyle's Law
  • MRI
  • physostome
  • target strength
  • water pressure
  • target-strength
  • fish abundance

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