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dc.contributor.authorFassler, S. M. M.
dc.contributor.authorO'Donnell, C.
dc.contributor.authorJech, J. M.
dc.date.accessioned2018-09-20T16:07:44Z
dc.date.available2018-09-20T16:07:44Z
dc.date.issued2013-08-06
dc.identifier.citationFassler, S. M. M. O'Donnell, C.; Jech, J. M. (2013). Boarfish (capros aper) target strength modelled from magnetic resonance imaging (mri) scans of its swimbladder. ICES Journal of Marine Science 70 (7), 1451-1459
dc.identifier.issn1054-3139,1095-9289
dc.identifier.urihttp://hdl.handle.net/10379/11423
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 log(10)(L) - 66.2. The intercept is similar to 1 dB higher than in the general physoclist relationship, potentially reflecting the bulky nature of the boarfish swimbladder with its relatively large circumference.
dc.publisherOxford University Press (OUP)
dc.relation.ispartofICES Journal of Marine Science
dc.subjectacoustic survey
dc.subjectboarfish
dc.subjectkirchhoff-ray mode (krm)
dc.subjectstock assessment
dc.subjecttarget strength
dc.subjectrelative frequency-response
dc.subjectpout trisopterus-esmarkii
dc.subjectherring clupea-harengus
dc.subjectcod gadus-morhua
dc.subjectspecies identification
dc.subjectatlantic mackerel
dc.subjectin-situ
dc.subjectkirchhoff-approximation
dc.subjectfisheries acoustics
dc.subjectwalleye pollock
dc.titleBoarfish (capros aper) target strength modelled from magnetic resonance imaging (mri) scans of its swimbladder
dc.typeArticle
dc.identifier.doi10.1093/icesjms/fst095
dc.local.publishedsourcehttps://academic.oup.com/icesjms/article-pdf/70/7/1451/1667345/fst095.pdf
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