Number of the records: 1

Regressions for conversion between target strength and fish length in horizontal acoustic surveys

SYSNO ASEP	0330234
Document Type	C - Proceedings Paper (int. conf.)
R&D Document Type	Conference Paper
Title	Regressions for conversion between target strength and fish length in horizontal acoustic surveys
Author(s)	Kubečka, Jan (BC-A)_{RID, ORCID} Frouzová, Jaroslava (BC-A)_{RID, ORCID} Balk, H. (NO) Čech, Martin (BC-A)_{RID, ORCID} Draštík, Vladislav (BC-A)_{RID, ORCID} Prchalová, Marie (BC-A)_{RID, ORCID}
Source Title	Underwater acoustic measurements, Technologies & Results. - Heraklion : Foundation for Research & Technology, 2009 / Papadakis J. S. ; Bjorno L. - ISBN 978-960-98883-2-5
Pages	s. 1039-1044
Number of pages	6 s.
Action	Underwater acoustic measurements, Technologies & Results
Event date	21.06.2009-27.06.2009
VEvent location	Nafplion
Country	GR - Greece
Event type	WRD
Language	eng - English
Country	GR - Greece
Keywords	acoustic fish assessment ; target strength ; water framework directive
Subject RIV	EH - Ecology, Behaviour
R&D Projects	GA206/07/1392 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z60170517 - HBU-Z, BC-A (2005-2011)
Annotation	Both ways conversions between fish target strength (TS) and length are extremely important for the accuracy of acoustic fisheries surveys. At present, no universal method is available for aspect corrections during mobile horizontal surveys. For random aspect situations, the deconvolution of fish aspect in the beam can be used converting all TS to side aspect whose relationship to length is well known. For converting catch data to TS, the regression of TS of average horizontal backscattering strength on length can be applied successfully. The average regressions for common European species are being suggested for routine acoustic surveys in combination with direct pelagic fishing for the assessment of ecological status of lakes and reservoirs for EU Water framework directive. This approach reduces the resolution towards local fish size variations but simplifies the processing and provides much better definition of fish abundance.
Workplace	Biology Centre (since 2006)
Contact	Dana Hypšová, eje@eje.cz, Tel.: 387 775 214
Year of Publishing	2010

Number of the records: 1