Figure 1.

(a) Sustained aerobic swimming performance (maximal critical swimming speed, U_crit, mean±s.e.) and (b) factorial cardiac scope (mean±s.e.) of Pagothenia borchgrevincki acclimated to natural temperatures (−1 °C; closed circles, solid lines) and to 4 °C (open circles, broken lines) for 4–5 weeks. BL, body length.