Blood lactate loads of redthroat emperor Lethrinus miniatus associated with angling stress and exhaustive exercise

Currey, L.M.;Heupel, M.R.;Simpfendorfer, C.A.;Clark, T.D.

Abstract

Baseline, post-angling and maximum attainable blood lactate concentrations were measured for the fishery species redthroat emperor Lethrinus miniatus to gain insight into the condition of fish released following c. 30 s angling and <45 s air exposure. Mean ± s.d. baseline blood lactate was 1·5 ± 0·6 mmol l⁻¹, which increased and plateaued around 6 mmol l⁻¹ at 15–30 min post-angling. These values were significantly lower than those obtained from fish maximally exhausted with a prolonged chase and air exposure protocol following capture (10·9 ± 1·8 mmol l⁻¹), suggesting that L. miniatus is not maximally exhausted during standard angling practices.

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Journal of Fish Biology

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1095-8649

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Wiley-Blackwell

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DOI

10.1111/jfb.12216