Sammendrag
European grayling (Thymallus thymallus) is a popular recreational fish that may be lifted
out of the water to facilitate hook removal or for admiration. To evaluate the effects of
air exposure and angling-induced exhaustive exercise on released grayling condition, we
assessed blood physiology and reflexes of grayling after angling and air exposure in the
subarctic River Lakselva (Norway) at midsummer temperatures (i.e., 17–18 °C). Blood
samples were drawn 30 min after angling and analyzed for lactate anions, glucose, sodium
ions, and pH. Reflex impairment was determined with orientation and tail grab reflex
action assessments immediately after landing, after air exposure, and after 30 min holding.
Blood physiology did not indicate an exacerbating effect of air exposure relative to just
angling-induced exercise, but significant and prolonged reflex impairment was associated
with the 120 s air exposure interval. Anglers must take care to minimize air exposure to
adhere to best handling practices.
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