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dc.contributor.authorFassler, S.
dc.contributor.authorO'Donnell, C.
dc.contributor.authorJech, J.
dc.date.accessioned2014-05-16T14:49:10Z
dc.date.available2014-05-16T14:49:10Z
dc.date.issued2013
dc.identifier.citationSascha M. M. Fässler, Ciaran O'Donnell, and J. M. Jechen_GB
dc.identifier.otherDOI:10.1093/icesjms/fst095
dc.identifier.urihttp://hdl.handle.net/10793/964
dc.description.abstractBoarfish (Capros aper) abundance has increased dramatically in the Northeast Atlantic from the early 1970s after successive years of good recruitment attributed to an increase in sea surface temperature. Due to increased commercial fishing over recent years, an acoustic boarfish survey funded by the Killybegs Fishermen's Organisation was initiated by the Marine Institute to establish a baseline for the future management of this stock. In the absence of any species-specific boarfish target strength (TS), acoustic backscatter was estimated by a Kirchhoff-ray mode model using reconstructed three-dimensional swimbladder shapes which were computed from magnetic resonance imaging scans of whole fish. The model predicted TS as a function of size, fish tilt angle, and operating frequency. Standardized directivity patterns revealed the increasing importance of changes in the inclination of the dorsal swimbladder surface at higher frequencies (120 and 200 kHz) and a less directive response at lower frequencies (18 and 38 kHz). The model predicted a TS-to-total fish length relationship of TS = 20 log10(L) − 66.2. The intercept is ∼1 dB higher than in the general physoclist relationship, potentially reflecting the bulky nature of the boarfish swimbladder with its relatively large circumference.en_GB
dc.description.sponsorshipKillybegs Fishermens Organisation & The dutch KBWOT Fisheries Programmeen_GB
dc.language.isoenen_GB
dc.publisherInternational Council for the Exploration of the Sea (ICES)en_GB
dc.relation.ispartofseriesICES Journal of Marine Science 2013;Vol 7 (7)
dc.subjectacoustic surveyen_GB
dc.subjectboarfishen_GB
dc.subjectKirchhoff-ray mode (KRM)en_GB
dc.subjectstock assessmenten_GB
dc.subjecttarget strengthen_GB
dc.titleBoarfish (Capros aper) target strength modelled from magnetic resonance imaging (MRI) scans of its swimbladderen_GB
dc.typeTechnical Reporten_GB
refterms.dateFOA2018-01-12T03:13:02Z


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