dc.contributor.author | Axelsen, Bjørn Erik | |
dc.date.accessioned | 2012-10-12T19:23:19Z | |
dc.date.available | 2012-10-12T19:23:19Z | |
dc.date.issued | 1999 | |
dc.identifier.citation | This report is not to be cited without prior reference to the author | no_NO |
dc.identifier.uri | http://hdl.handle.net/11250/105933 | |
dc.description.abstract | The acoustical target strength (TS) of Cape horse mackerel (Trachurus capensis) was
measured in situ at 38 kHz using a submersible split beam transducer in combination with a
SIMRAD EK 500 echosounder. The transducer head was lowered to scattered aggregations of
horse mackerel close to the bottom in order to resolve single echo targets at short range (5-30
m), Echograms were printed for a range intervai of 5-50 meters from the transducer head,
Time of reception, compensated and uncompensated TS, range and alongship and
athwardship offset angle were recorded from the EK 500 serial port and stored in ASCII- files
at an IBM- compatible computer. Single fish targets were tracked using especially developed
software and selected for analysis. The measurements suggest a lower TS than presently
applied, but the literature is inconclusive on the matter, and the results should therefore be
interpreted with caution. | no_NO |
dc.language.iso | eng | no_NO |
dc.publisher | ICES | no_NO |
dc.relation.ispartofseries | ICES CM Documents;1999/J:4 | |
dc.subject | acoustics | no_NO |
dc.subject | akustikk | no_NO |
dc.subject | horse mackerel | no_NO |
dc.subject | taggmakrell | no_NO |
dc.subject | gear experiments | no_NO |
dc.subject | redskapsforsøk | no_NO |
dc.title | In situ of Cape horse mackerel (Trachurus capensis) | no_NO |
dc.type | Working paper | no_NO |
dc.subject.nsi | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 | no_NO |
dc.subject.nsi | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 | no_NO |
dc.source.pagenumber | 16 s. | no_NO |