Number of the records: 1
Distribution patterns, annual density changes, growth and mortality of pikeperch [iSander lucioperca/i (L. 1758)] fry following oligotrophication of a reservoir
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SYSNO ASEP 0583728 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Distribution patterns, annual density changes, growth and mortality of pikeperch [iSander lucioperca/i (L. 1758)] fry following oligotrophication of a reservoir Author(s) Jůza, Tomáš (BC-A) RID, ORCID
Blabolil, Petr (BC-A) RID, ORCID
Čech, Martin (BC-A) RID, ORCID
Draštík, Vladislav (BC-A) RID, ORCID
Hejzlar, Josef (BC-A) RID, ORCID
Kočvara, Luboš (BC-A) RID, ORCID
Muška, Milan (BC-A) RID, ORCID
Peterka, Jiří (BC-A) RID, ORCID
Sajdlová, Zuzana (BC-A) RID, ORCID
Tušer, Michal (BC-A) RID, ORCID
Vašek, Mojmír (BC-A) RID, ORCID
Kubečka, Jan (BC-A) RID, ORCIDNumber of authors 12 Source Title Ecology of Freshwater Fish. - : Wiley - ISSN 0906-6691
Roč. 32, č. 4 (2023), s. 724-734Number of pages 11 s. Language eng - English Country US - United States Keywords diel vertical migrations ; stizostedion-lucioperca ; winter mortality ; perca-fluviatilis ; ichthyoplankton ; oligotrophication ; overfishing Subject RIV EH - Ecology, Behaviour OECD category Ecology R&D Projects EF16_025/0007417 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) QK22020134 GA MZe - Ministry of Agriculture (MZe) Method of publishing Open access Institutional support BC-A - RVO:60077344 UT WOS 000956739700001 EID SCOPUS 85150952177 DOI 10.1111/eff.12718 Annotation Until 2006, the Lipno Reservoir had the largest catches of pikeperch in the Czech Republic, but since 2007 it has partially collapsed. This collapse was preceded by oligotrophication, when phosphorus concentrations declined by 25%. Conservation measures from 2009 to 2015 partially improved the population from 2015, but pikeperch biomass did not reach previous levels. Unsuccessful spawning and low survival of pikeperch fry were suspected as possible reasons. Pelagic trawling for pikeperch younger juveniles in June and older juveniles in August indicated that extreme mortality in the first year of life, rather than limited spawning, was the reason for low pikeperch recruitment. Large interannual differences in pikeperch density were observed in both spring and summer, and the growth was generally low. Pikeperch fry density changed over a trophic gradient with the highest densities in the eutrophic upper reservoir parts, while differences between depths were much less pronounced due to the lack of temperature and oxygen depth stratification in summer. Oligotrophication of the reservoir in recent years is probably partly responsible for the high mortality and slow growth of pikeperch fry that are still zooplanktivorous, resulting in a lower probability of surviving their first winter. Given the changing conditions in the reservoir, measures should be taken to strictly conserve populations to maintain self-sustaining pikeperch populations in the Lipno Reservoir. Workplace Biology Centre (since 2006) Contact Dana Hypšová, eje@eje.cz, Tel.: 387 775 214 Year of Publishing 2024 Electronic address https://doi.org/10.1111/eff.12718
Number of the records: 1