Winter activity of common bream (Abramis brama L.) in a European reservoir

0489656 - ÚBO 2019 RIV US eng J - Journal Article
Jurajda, Pavel - Roche, Kevin Francis - Halačka, Karel - Mrkvová, Markéta - Zukal, Jan
Winter activity of common bream (Abramis brama L.) in a European reservoir.
Fisheries Management and Ecology. Roč. 25, č. 3 (2018), s. 163-171. ISSN 0969-997X. E-ISSN 1365-2400
R&D Projects: GA ČR(CZ) GBP505/12/G112
Institutional support: RVO:68081766
Keywords : cyprinid behaviour * fish metabolism * predation risk * reservoir fisheries * telemetry * thermocline
OECD category: Fishery
Impact factor: 1.667, year: 2018

As temperatures drop and fish metabolism slows, cyprinids are generally assumed to form dense, static shoals or migrate to suitable sites up tributaries to reduce predation risk. Using telemetry, common bream Abramis brama (L.) were observed to remain active and (presumably) foraged throughout winter in an area in the middle of an 8‐m‐deep valley reservoir coinciding with a 3–5 m zone of warmer, oxygenated water below an inverse thermocline. Tagged bream appeared to avoid cold, shallow zones (<1.5 m) at the inlet and banks and the deepest zone (5–8 m) near the dam/outlet, possibly due to poor food availability. Under certain conditions, bream populations showed higher levels of winter activity (and feeding) than previously assumed, with implications for both reservoir fisheries management and future studies assessing cyprinid behaviour, energy budgets and diet in lakes and reservoirs.
Permanent Link: http://hdl.handle.net/11104/0284028