High mobility and flexibility in the habitat use of early juvenile pikeperch (iSander lucioperca/i) based on a mark-recapture experiment

0583781 - BC 2024 RIV CH eng J - Journal Article
Blabolil, Petr - Jůza, Tomáš - Čech, Martin - Peterka, Jiří
High mobility and flexibility in the habitat use of early juvenile pikeperch (iSander lucioperca/i) based on a mark-recapture experiment.
Diversity. Roč. 15, č. 6 (2023), č. článku 720. E-ISSN 1424-2818
R&D Projects: GA MZe(CZ) QK23020002; GA MŠMT(CZ) EF16_025/0007417
Grant - others:AV ČR(CZ) StrategieAV21/21
Program: StrategieAV
Institutional support: RVO:60077344
Keywords : diel vertical migrations * fish populations * horizontal distribution * vertical distribution
OECD category: Marine biology, freshwater biology, limnology
Impact factor: 2.4, year: 2022
Method of publishing: Open access
https://doi.org/10.3390/d15060720

Disentangling the role of factors responsible for juvenile fish dispersal is essential to understand the ecology of individual species, setting the corresponding conservation status and evaluating the potential risk in case of invasion. Because of their small body size and high sensitivity to environmental conditions, juvenile fish movements have largely been explained by external factors such as wind-induced water currents. In this study, early hatched pikeperch (Sander lucioperca) of hatchery origin were marked with oxytetracycline hydrochloride, stocked into a bay near the dam of a deep reservoir, and then monitored at approximately 10-day intervals using fix-frame trawling for 43 and 51 days after stocking, in 2007 and 2008, respectively. In both years, marked pikeperch were captured throughout the study period in the bay and closed dam section of the reservoir. After one month, individuals were captured in the middle section of the reservoir, approximately 5 km upstream from the stocking site. Four individuals were recaptured in the tributary section of the reservoir, about 10 km upstream from the stocking site during the last sampling in 2007. The farthest distance detection followed periods of strong wind. During daytime sampling, marked pikeperch were captured in both the warm epipelagic layer above the thermocline and the cold bathypelagic layer below the thermocline. The later sampling represented a community of vertically migrating individuals originally thought to consist only of reservoir-born and reservoir-experienced fish. This study suggested the high mobility and flexibility of 0+ pikeperch, as well as their unexpected behavioral plasticity.
Permanent Link: https://hdl.handle.net/11104/0351784