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Table 2.

Mean (± s.e.m.) state 4 membrane potentials, state 4 respiration rates, state 3 respiration rates and respiratory control ratios (RCRs) of shark red muscle and liver mitochondria at 20°C

Tissue and speciesState 4 membrane potential (mV)State 4 respiration rate (nmol O min−1 mg−1protein)State 3 respiration rate (nmol O min−1 mg−1protein)RCR
Red myotomal muscle     
Isurus oxyrinchus (shortfin mako shark) 183.0±2.0a 28.4±4.38a 87.8±19.9a 2.89±0.31 
Prionace glauca (blue shark) 163.4±3.9b 6.83±0.70b 27.9±4.53b 3.97±0.30 
Triakis semifasciata (leopard shark) 167.0±4.7b 6.41±1.14b 22.9±2.85b 2.91±0.28 
Liver     
Isurus oxyrinchus (shortfin mako shark) 188.7±7.8a 12.2±2.90a 59.4±13.4a 5.00±0.43 
Prionace glauca (blue shark) 194.5±10.1a 7.07±1.03a,b 32.1±4.95a,b 4.47±0.36 
Triakis semifasciata (leopard shark) 157.2±3.8b 3.57±0.31b 9.6±1.46b 2.80±0.38 
Tissue and speciesState 4 membrane potential (mV)State 4 respiration rate (nmol O min−1 mg−1protein)State 3 respiration rate (nmol O min−1 mg−1protein)RCR
Red myotomal muscle     
Isurus oxyrinchus (shortfin mako shark) 183.0±2.0a 28.4±4.38a 87.8±19.9a 2.89±0.31 
Prionace glauca (blue shark) 163.4±3.9b 6.83±0.70b 27.9±4.53b 3.97±0.30 
Triakis semifasciata (leopard shark) 167.0±4.7b 6.41±1.14b 22.9±2.85b 2.91±0.28 
Liver     
Isurus oxyrinchus (shortfin mako shark) 188.7±7.8a 12.2±2.90a 59.4±13.4a 5.00±0.43 
Prionace glauca (blue shark) 194.5±10.1a 7.07±1.03a,b 32.1±4.95a,b 4.47±0.36 
Triakis semifasciata (leopard shark) 157.2±3.8b 3.57±0.31b 9.6±1.46b 2.80±0.38 

Similar superscript letters denote tissue means that are statistically similar for each variable.

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