Number of the records: 1

Fish orientation along the longitudinal profile of the Římov reservoir during daytime: Consequences for horizontal acoustic surveys

SYSNO ASEP	0320644
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Fish orientation along the longitudinal profile of the Římov reservoir during daytime: Consequences for horizontal acoustic surveys
Title	Orientace ryb v podélném profilu nádrže Římov během dne: Následky pro horizontální akustické průzkumy
Author(s)	Tušer, Michal (BC-A)_{RID, ORCID} Kubečka, Jan (BC-A)_{RID, ORCID} Frouzová, Jaroslava (BC-A)_{RID, ORCID} Jarolím, Oldřich (BC-A)
Source Title	Fisheries Research. - : Elsevier - ISSN 0165-7836 Roč. 96, č. 1 (2009), s. 23-29
Number of pages	7 s.
Action	Fish Stock Assessment Methods for Lakes and Reservoirs: Towards the true picture of fish stock
Event date	11.09.2007-15.09.2007
VEvent location	České Budějovice
Country	CZ - Czech Republic
Event type	WRD
Language	eng - English
Country	NL - Netherlands
Keywords	acoustics ; fish orientation ; fish aspect ; freshwater ; canyon-shaped reservoir ; daytime
Subject RIV	EH - Ecology, Behaviour
R&D Projects	GA206/07/1392 GA ČR - Czech Science Foundation (CSF)
	IAA600170502 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
CEZ	AV0Z60170517 - HBU-Z, BC-A (2005-2011)
UT WOS	000263396600005
DOI	10.1016/j.fishres.2008.09.022
Annotation	The orientation of fish has important consequences for estimating their true size from horizontal acoustic records. The aim of this work was to verify the assumption of randomly orientated fish in the lacustrine zone of the canyon-shaped Římov reservoir during daytime and to compare distributions of fish orientation between the lacustrine and tributary (riverine) zones. We used a SIMRAD EK 60 echosounder (120 kHz) and a cross-filter detector to process acoustic data. Fish orientation was described as a horizontal aspect. The frequency distribution of fish aspect in the lacustrine zone appeared very similar when recorded by sonar beams oriented parallel to and across the longitudinal axis of the reservoir. In the tributary zone, beaming perpendicular to the axis of the reservoir revealed a significantly higher proportion of fish moving along the longitudinal axis. Therefore, the assumption of random fish orientation is not applicable in the tributary zones of such reservoirs.
Workplace	Biology Centre (since 2006)
Contact	Dana Hypšová, eje@eje.cz, Tel.: 387 775 214
Year of Publishing	2009

Number of the records: 1