Diel vertical migrations of age 0+ percids in a shallow, well-mixed reservoir

0349550 - BC 2011 RIV IT eng J - Journal Article
Kratochvíl, M. - Čech, Martin - Vašek, Mojmír - Kubečka, Jan - Hejzlar, Josef - Matěna, Josef - Peterka, Jiří - Macháček, Jiří - Seďa, Jaromír
Diel vertical migrations of age 0+ percids in a shallow, well-mixed reservoir.
Journal of Limnology. Roč. 69, č. 2 (2010), s. 305-310. ISSN 1129-5767. E-ISSN 1723-8633
R&D Projects: GA ČR(CZ) GA206/06/1371; GA ČR(CZ) GP206/09/P266; GA AV ČR(CZ) 1QS600170504
Institutional research plan: CEZ:AV0Z60170517
Keywords : Perca fluviatilis * Sander lucioperca * DVM * juvenile
Subject RIV: EH - Ecology, Behaviour
Impact factor: 1.140, year: 2010

The distribution of age 0+ perch, Perca fluviatilis and pikeperch, Sander lucioperca was investigated in a shallow reservoir during a 24-h period in late May, using acoustic and netting methods. Diel vertical migrations (DVMs) were acoustically recorded between the layers close to the bottom and the whole water column. The netting data showed a high abundance of larvae and juveniles at night, whereas negligible numbers of age 0+ percids were present in the water column during the day. A strong difference between day and night abundances along with a clear pattern discerned by acoustic methods revealed the DVM of age 0+ percids. Analyses of the fish digestive tract contents indicate that DVM was not governed by feeding behaviour, but rather a defensive strategy against predation. This is in agreement with the size distribution of age 0+ percids, since they were smaller in water column during the day as opposed to the night.
Permanent Link: http://hdl.handle.net/11104/0189755