Hydrostatic stability of fish with swim bladders: not all fish are unstable
The center of mass and the center of buoyancy were found to occur at the same relative longitudinal location along the body of the elongate-bodied European eel (Anguilla anguilla), the fusiform yellow perch (Perca flavescens), and two gibbose species, rock bass (Ambloplites rupestris) and bluegill (...
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Language: | English |
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Canadian Science Publishing
1994
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crcansciencepubl:10.1139/z94-153 2024-06-23T07:45:33+00:00 Hydrostatic stability of fish with swim bladders: not all fish are unstable Webb, Paul W. Weihs, D. 1994 http://dx.doi.org/10.1139/z94-153 http://www.nrcresearchpress.com/doi/pdf/10.1139/z94-153 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 72, issue 6, page 1149-1154 ISSN 0008-4301 1480-3283 journal-article 1994 crcansciencepubl https://doi.org/10.1139/z94-153 2024-06-13T04:10:49Z The center of mass and the center of buoyancy were found to occur at the same relative longitudinal location along the body of the elongate-bodied European eel (Anguilla anguilla), the fusiform yellow perch (Perca flavescens), and two gibbose species, rock bass (Ambloplites rupestris) and bluegill (Lepomis macrochirus). The locations of these centers were not affected by fish size. Therefore the fish were neutral in hydrostatic pitching equilibrium. The vertical location of the centers of mass and buoyancy were the same for bluegill, but the center of mass was dorsal to the center of buoyancy in yellow perch. The observations on bluegill show that neutral hydrostatic rolling equilibrium is possible. Our conclusions on similarity or separation between the locations of the centers of mass and buoyancy derive from tests of significance and differ from conclusions reported elsewhere on the basis of mean values only. In general, fish with swim bladders can be at or close to neutral hydrostatic equilibrium but any disturbance will be destabilizing. This probably explains continuous fin-beating of fish in apparently still water. Article in Journal/Newspaper Anguilla anguilla European eel Canadian Science Publishing Canadian Journal of Zoology 72 6 1149 1154 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
The center of mass and the center of buoyancy were found to occur at the same relative longitudinal location along the body of the elongate-bodied European eel (Anguilla anguilla), the fusiform yellow perch (Perca flavescens), and two gibbose species, rock bass (Ambloplites rupestris) and bluegill (Lepomis macrochirus). The locations of these centers were not affected by fish size. Therefore the fish were neutral in hydrostatic pitching equilibrium. The vertical location of the centers of mass and buoyancy were the same for bluegill, but the center of mass was dorsal to the center of buoyancy in yellow perch. The observations on bluegill show that neutral hydrostatic rolling equilibrium is possible. Our conclusions on similarity or separation between the locations of the centers of mass and buoyancy derive from tests of significance and differ from conclusions reported elsewhere on the basis of mean values only. In general, fish with swim bladders can be at or close to neutral hydrostatic equilibrium but any disturbance will be destabilizing. This probably explains continuous fin-beating of fish in apparently still water. |
format |
Article in Journal/Newspaper |
author |
Webb, Paul W. Weihs, D. |
spellingShingle |
Webb, Paul W. Weihs, D. Hydrostatic stability of fish with swim bladders: not all fish are unstable |
author_facet |
Webb, Paul W. Weihs, D. |
author_sort |
Webb, Paul W. |
title |
Hydrostatic stability of fish with swim bladders: not all fish are unstable |
title_short |
Hydrostatic stability of fish with swim bladders: not all fish are unstable |
title_full |
Hydrostatic stability of fish with swim bladders: not all fish are unstable |
title_fullStr |
Hydrostatic stability of fish with swim bladders: not all fish are unstable |
title_full_unstemmed |
Hydrostatic stability of fish with swim bladders: not all fish are unstable |
title_sort |
hydrostatic stability of fish with swim bladders: not all fish are unstable |
publisher |
Canadian Science Publishing |
publishDate |
1994 |
url |
http://dx.doi.org/10.1139/z94-153 http://www.nrcresearchpress.com/doi/pdf/10.1139/z94-153 |
genre |
Anguilla anguilla European eel |
genre_facet |
Anguilla anguilla European eel |
op_source |
Canadian Journal of Zoology volume 72, issue 6, page 1149-1154 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z94-153 |
container_title |
Canadian Journal of Zoology |
container_volume |
72 |
container_issue |
6 |
container_start_page |
1149 |
op_container_end_page |
1154 |
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1802640780697796608 |