Fish activity as determined by gillnet catch: A comparison of two reservoirs of different turbidity

0339159 - BC 2011 RIV NL eng J - Článek v odborném periodiku
Prchalová, Marie - Mrkvička, T. - Kubečka, Jan - Peterka, Jiří - Čech, Martin - Muška, Milan - Kratochvíl, Michal - Vašek, Mojmír
Fish activity as determined by gillnet catch: A comparison of two reservoirs of different turbidity.
Fisheries Research. Roč. 102, č. 3 (2010), s. 291-296. ISSN 0165-7836. E-ISSN 1872-6763
Grant ostatní: NFM(CZ) CZ0091
Výzkumný záměr: CEZ:AV0Z60170517
Klíčová slova: diel pattern * soak time * CPUE
Kód oboru RIV: EH - Ekologie - společenstva
Impakt faktor: 1.656, rok: 2010

Fish activity was monitored analyzing the catches of gillnets exposed for short time intervals at night. The aims of the study were to describe and model a pattern of fish activity in general and on species and age group levels, and in turbid and clear water. Fish activity showed two distinct peaks around sunset and sunrise and was low during night. This pattern was the same in clear and turbid reservoirs, as well as for all species and age groups tested. This study established some justifications and standards for gillnet sampling: (i) it is possible to compare overnight gillnet catches between different lowland European species and waterbodies, as the pattern of fish activity is general; (ii) gillnets should be set 2–3 h before sunset and lifted 2–3 h after sunrise to cover activity peaks, thus getting reliable and comparable results; (iii) depicting gillnet catches per average hour of exposition produces biased and incomparable results.
Trvalý link: http://hdl.handle.net/11104/0182745