Sampling of deep benthic perch fry: insight into the diel vertical migrations.

0465330 - BC 2017 RIV NL eng J - Článek v odborném periodiku
Čech, Martin - Frouzová, Jaroslava - Peterka, Jiří - Jůza, Tomáš - Draštík, Vladislav - Vašek, Mojmír - Kubečka, Jan
Sampling of deep benthic perch fry: insight into the diel vertical migrations.
Hydrobiologia. Roč. 784, č. 1 (2017), s. 1-8. ISSN 0018-8158. E-ISSN 1573-5117
Grant CEP: GA ČR GA206/06/1371; GA ČR GP206/09/P266; GA MŠMT(CZ) EE2.3.20.0204; GA MŠMT(CZ) 7F14316
Institucionální podpora: RVO:60077344
Klíčová slova: bathypelagic perch fry * Breder trap * Fulton's condition factor * Perca fluviatilis * Římov Reservoir * SCUBA diving
Obor OECD: Zoology
Impakt faktor: 2.165, rok: 2017

At depths smaller than those of the daytime bathypelagic layers, the vertically migrating perch Perca fluviatilis fry form a benthic community. Modified Breder traps were used for sampling these deep benthic perch fry during their daylight stay in the benthic habitat of Řimov Reservoir, Czech Republic, in spring 2007 and 2009. The size and condition of perch caught in the traps (the catch was removed in late afternoon) was compared to that of fish caught by trawl in the bathypelagic habitat at midday and by electrofishing in the littoral habitat at midday. Perch from the traps were in significantly worse condition compared to those from the trawl and electrofishing. All fish left in the traps overnight were dead. It is likely that the evening migration to the epilimnion is essential for perch fry performing diel vertical migrations in stratified canyon-shaped reservoirs. The sampling efficiency of traps is strongly affected by the abundance of targeted fish and their swimming activity in a cold and dark benthic habitat.
Trvalý link: http://hdl.handle.net/11104/0267854