Newly hatched herring and plaice larvae were stimulated by probes to make C-start escape responses at temperatures between 5 and 15 °C. The responses and the subsequent burst-speed swimming were recorded and analysed using high-speed video at 400 frames s−1. The muscle contraction time of the initial C-start was temperature-dependent, ranging from 22–33 ms at 5°C to 17–21 ms at 15°C. Immediately following the C-start, tail-beat frequency ranged from 18s−1 at 5°C to 35 s−1 at 15°C. Tail-beat amplitude, equivalent to 0.4-0.6 of a body length (L), and stride length, about 0.5 L, were not temperature-dependent. The escape speed ranged from 8 Ls−1 at 5°C to 15 Ls−1 at 15 °C. These results and those of other workers can be described by the equation:

f=100e−99/(t+29.5)L−0.266,

where f is tail-beat frequency, t is temperature and L is length.

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