Skip Navigation


ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on April 22, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(6):1162-1168; doi:10.1093/icesjms/fsp101
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow All Versions of this Article:
66/6/1162    most recent
fsp101v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Horne, J. K.
Right arrow Articles by Sadayasu, K.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Horne, J. K.
Right arrow Articles by Sadayasu, K.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

This article appears in the following ICES Journal of Marine Science issue: The Ecosystem Approach with Fisheries Acoustics and Complementary Technologies [View the issue table of contents]

Swimbladders under pressure: anatomical and acoustic responses by walleye pollock

John K. Horne1, Kouichi Sawada2, Koki Abe2, Richard B. Kreisberg1, David H. Barbee1 and Kazuhiro Sadayasu2

1 School of Aquatic and Fishery Sciences, University of Washington, Seattle, WA 98195-5020, USA
2 National Research Institute of Fisheries Engineering, 7620-7, Hasaki, Kamisu, Ibaraki 314-0408, Japan

Correspondence to J. K. Horne: tel: +1 206 221 6890; fax: +1 206 221 6939; e-mail: jhorne{at}u.washington.edu.

Horne, J. K., Sawada, K., Abe, K., Kreisberg, R. B., Barbee, D. H., and Sadayasu, K. 2009. Swimbladders under pressure: anatomical and acoustic responses by walleye pollock. – ICES Journal of Marine Science, 66: 1162–1168.

Pressure influences echo intensities from fish through changes in swimbladder volumes and surface areas. Volume reduction is expected to correspond to Boyle’s law (volume {alpha} pressure–1), but the effects of deforming the dorsal-aspect surface area of the swimbladder on the target strength (TS) of a physoclist have not been quantified at geometric scattering frequencies. Dorsal and lateral radiographs of three juvenile walleye pollock (Theragra chalcogramma) in a pressure chamber were used to image swimbladders from ambient to a maximum of 4.9 x 105 Pa (i.e. 5 atm). Radiographs from an additional 16 0-group, 21 juvenile, and 28 adult fish were used to compare swimbladder sizes and shapes across life-history stages. The directional elliptical eccentricity, which describes the relative compression in dorsal and lateral planes, was formulated to define swimbladder shapes and their variation. As pressure increased, dorsal-aspect surface areas of the swimbladder decreased at a constant rate. Swimbladder-volume reductions were similar among individuals, but less than those predicted by Boyle’s law. Compression was greatest in the dorsal–ventral plane and asymmetric anterior to posterior. The Kirchhoff-ray mode backscatter model predicted that TS at 38 and 120 kHz decreased by ~4 dB as pressure increased from ambient to 4.9 x 105 Pa.

Keywords: pressure, swimbladder compression, target strength, walleye pollock

Received 1 August 2008; accepted 23 December 2008; advance access publication 22 April 2009.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.