PLASMA LACTATE AND STRESS HORMONES IN COMMON CARP (CYPRINUS CARPIO) AND RAINBOW TROUT (ONCORHYNCHUS MYKISS) DURING STEPWISE DECREASING OXYGEN LEVELS by G.J. VIANEN1, G.E.E.J.M. VAN DEN THILLART1, M. VAN KAMPEN1, T.I. VAN HEEL1 and A.B. STEFFENS2 (1 Inst. of Evolutionary and Ecological Sciences, Dept. of Integrative Zoology, University of Leiden, Van der Klaauw Laboratories, Kaiserstraat 63, PO Box 9516, 2300 RA Leiden, The Netherlands, E-mail: Uianen@rulsfb.leidenuniv.nl; 2Dept. of Biology, Animal Physiology, University of Groningen, Kerklaan 10, PO Box 14, 9700 AA Haren, The Netherlands) ABSTRACT By measuring the lactate response it is possible to determine whether a teleost is able to adapt to a certain oxygen level. It is hypothesized that recovery will occur at oxygen levels above the critical oxygen level (PO2)crit reflected by a transient lactate increase. In contrast, continuous lactate accumulation occurs at oxygen levels below the (PO2)crit, which will be lethal in case of prolonged exposure. Since catecholamines as well as cortisol increase the availability of glucose, it is expected that these stress hormones are involved in the activation of the anaerobic metabolism. Common carp and rainbow trout were cannulated and exposed to stepwise decreasing oxygen levels. At each oxygen level blood samples were
Netherlands Journal of Zoology (in 2003 continued as Animal Biology) – Brill
Published: Jan 1, 2001
Keywords: rainbow trout (Oncorhynchus mykiss); common carp (Cyprinus carpio); anaerobic threshold; hypoxia; cortisol; lactate; catecholamines
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