Table 1.

Myofibrillar ATPase activity (mmol of inorganic phosphate produced min⁻¹ mg protein⁻¹; means±s.e.) in pectoral muscle of cold (−1 °C) and warm (+4 °C) acclimated Pagothenia borchgrevincki

test temperature (°C)	cold-acclimated (−1 °C)	warm-acclimated (4 °C)
−1	3.17±1.03	1.83±0.57
4	4.48±1.14	4.03±0.87