Čech, Martin (HBU-Z) Kratochvíl, Michal (HBU-Z) Kubečka, Jan (HBU-Z) Draštík, Vladislav (HBU-Z) Matěna, Josef (HBU-Z)
Source Title
Journal of Fish Biology. - : Wiley
- ISSN 0022-1112
Roč. 66, č. 3 (2005), s. 685-702
Number of pages
18 s.
Language
eng - English
Country
GB - United Kingdom
Keywords
Slapy Reservoir ; fry distribution ; echosounder
Subject RIV
GL - Fishing
R&D Projects
IAA6017201 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
CEZ
AV0Z60170517 - HBU-Z, BC-A (2005-2011)
Annotation
The behaviour of young-of-the-year perch as a dominating species of the pelagic fry assemblage of the Slapy Reservoir (Czech Republic) was studied during late May and mid June 2002 using acoustic and complementing net catches. During the day the perch fry was present simultaneously in littoral, epipelagic and bathypelagic habitats. Bathypelagic perch fry forming a scattering layer performed extensive diel vertical migrations between the epilimnion and hypolimnion. At the dusk migrating bathypelagic perch fry mixed in epilimnion with non-migrating epipelagic perch fry and spent the night close to the thermocline. In June, shoaling behaviour of a certain part of bathypelagic perch fry was also observed. Shoaling perch fry remained shallower in the water column than non-shoaling bathypelagic perch fry. Both depth of scattering layer and depth of shoals were strongly controlled by the light intensity.
Workplace
Institute of Hydrobiology (until 2005)
Contact
Václava Lavičková, lavickova@hbu.cas.cz, Tel.: 387 775 889
Year of Publishing
2005
Number of the records: 1
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