Muscle AMPK activity (A), AMPK protein (B) and representative AMPK western blot (C) in goldfish exposed to normoxia (N; ∼9.5 mg O2l–1; open squares) and 12 h of hypoxia (∼0.3 mg O2l–1; closed squares). Muscle AMPK activity (A), AMPK protein (B) and representative AMPK western blot (C) in goldfish exposed to normoxia (N; ∼9.5 mg O2l–1; open squares) and 12 h of hypoxia (∼0.3 mg O2l–1; closed squares). Data are means ± s.e.m. (N=6 to 12). See Fig. 3 caption for more detail. *Significant difference from normoxia, P<0.05. Lindsay A. Jibb, and Jeffrey G. Richards J Exp Biol 2008;211:3111-3122 © The Company of Biologists Limited 2008