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Radio‐telemetry shows differences in the behaviour of wild and hatchery‐reared European grayling Thymallus thymallus in response to environmental variables
Author(s) -
Horká P.,
Horký P.,
Randák T.,
Turek J.,
Rylková K.,
Slavík O.
Publication year - 2015
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.12575
Subject(s) - biology , grayling , hatchery , diel vertical migration , fishery , ecology , biological dispersal , salmonidae , juvenile , stocking , piscivore , juvenile fish , salmo , fish <actinopterygii> , predation , predator , population , demography , sociology
Juvenile wild and hatchery‐reared European grayling Thymallus thymallus were tagged with radio‐transmitters and tracked in the Blanice River, River Elbe catchment, Czech Republic, to study their behavioural response to stocking and environmental variation. Both wild and hatchery‐reared T. thymallus increased their diel movements and home range with increasing light intensity, flow, temperature and turbidity, but the characteristics of their responses differed. Environmental variables influenced the movement of wild T. thymallus up to a specific threshold, whereas no such threshold was observed in hatchery‐reared T. thymallus . Hatchery‐reared fish displayed greater total migration distance over the study period (total migration) than did wild fish, which was caused mainly by their dispersal in the downstream direction.