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The Effect of Temperature on the Burst Swimming Performance of Fish Larvae
1 Dunstaffnage Marine Laboratory, PO Box 3, Oban, Argyll, PA34 4AD, Scotland
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.
Key words: fish larvae, locomotion, escape behaviour, C-starts, temperature, herring, Clupea harengus, plaice, Pleuronectes platessa
Accepted on May 27, 1992
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