caa a22 4500 397551118 CHVBK 20180308164750.0 cr unu---uuuuu 161202e199610 xx s 000 0 eng 10.1006/jmsc.1996.0106 doi (NATIONALLICENCE)oxford-10.1006/jmsc.1996.0106 Consequence of swimbladder model choice and fish orientation to target strength of three New Zealand fish species [Elektronische Daten] [Sam McClatchie, Jon Alsop, Zhen Ye, Roger F. Coombs] Information on fish orientation has lagged behind the development of models to estimate target strength from fish swimbladders, despite fish tilt angle being an important variable influencing target strength. Few studies compare models, because authors generally compare their own model results with experimental data. We contrast three models for estimating target strength from fish swimbladders, and compare the magnitude of the differences between models to the effects of fish tilt angle on target strength. The swimbladder models compared were the mapping method, a deformed cylinder model, and the equicylinder model. The deformed cylinder model should give average target strengths with accuracy between the "exact” mapping method solution and the "approximate” equicylinder solution. The effect on average target strength of having a 5° or a 15° standard deviation of tilt angles is far more significant than the choice of model used to estimate target strength. We estimate the first averaged target strengths for three New Zealand commercial fish species: southern blue whiting (Micromesistius australis Norman, 1937), red cod (Pseudophycis bachus Bloch and Schneider, 1801), and barracouta (Thyrsites atun Eupharasen, 1791). We suggest that the greatest gains in target strength accuracy may be made from acquiring better information on fish orientation, rather than from the development of more elaborate modelling methods. © 1996 International council for the Exploration of the Sea Articles nationallicence acoustics nationallicence target strength nationallicence swimbladder nationallicence model nationallicence McClatchie Sam National Institute of Water and Atmosphere (NIWA) PO Box 14-901, Kilbirnie, Wellington, New Zealand aut Alsop Jon Department of Mathematics and Statistics, University of Otago PO Box 56, Dunedin, New Zealand aut Ye Zhen Ocean Acoustics, Institute of Ocean Sciences Sidney, British Columbia, Canada, V8L 4B2 aut Coombs Roger F. National Institute of Water and Atmosphere (NIWA) PO Box 14-901, Kilbirnie, Wellington, New Zealand aut ICES Journal of Marine Science Oxford University Press 53/5(1996-10), 847-862 1054-3139 53:5<847 1996 53 icesjms https://doi.org/10.1006/jmsc.1996.0106 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1006/jmsc.1996.0106 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- McClatchie Sam National Institute of Water and Atmosphere (NIWA) PO Box 14-901, Kilbirnie, Wellington, New Zealand aut NATIONALLICENCE 700 1- Alsop Jon Department of Mathematics and Statistics, University of Otago PO Box 56, Dunedin, New Zealand aut NATIONALLICENCE 700 1- Ye Zhen Ocean Acoustics, Institute of Ocean Sciences Sidney, British Columbia, Canada, V8L 4B2 aut NATIONALLICENCE 700 1- Coombs Roger F. National Institute of Water and Atmosphere (NIWA) PO Box 14-901, Kilbirnie, Wellington, New Zealand aut NATIONALLICENCE 773 0- ICES Journal of Marine Science Oxford University Press 53/5(1996-10), 847-862 1054-3139 53:5<847 1996 53 icesjms Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford