Summary
Capture by angling was used to induce burst exercise in northern pike. By 3 h after exercise blood lactate had risen to levels of 15.2 mmol l−1 (Fig. 2), which greatly exceeded the maximum post-exercise levels (4.0 mmol l−1) previously reported for muskellunge, a close relative of pike. White muscle lactate level was high, 41.8 mmol kg−1, immediately after capture but declined to 23.2 mmol kg−1 by 6 h (Fig. 2). Blood glucose level more than doubled after exercise and remained elevated even after 96 h of recovery (Fig. 2).
During the first 6 h after angling, pike disposed of 9.57 mmol (861 mg) of lactate per kg body weight. A whole body metabolic rate of 153 mg O2 kg−1 h−1 is sufficient to account for this rate of lactate removal through oxidation (Table 3). However, the metabolic rate of the highly oxidative organs and tissues (red muscle, gills, liver, kidney, heart, and spleen) must be very high (>1,000 mg O2 kg−1 h−1) to oxidize even 60% of the lactate that disappeared from pike after exercise (Fig. 5).
Mortality of pike from angling stress was less than 3%.
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Abbreviations
- MW :
-
molecular weight
- KOH :
-
potassium hydroxide
- CI's :
-
confidence intervals
- MR :
-
metabolic rate
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Schwalme, K., Mackay, W.C. The influence of angling-induced exercise on the carbohydrate metabolism of northern pike (Esox lucius L.). J Comp Physiol B 156, 67–75 (1985). https://doi.org/10.1007/BF00692927
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DOI: https://doi.org/10.1007/BF00692927