Effects of sudden changes in salinity on endogenous rhythms of the spotted sea bass Lateolabrax sp. |
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Authors: | W S Kim J M Kim M S Kim C W Park H T Huh |
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Institution: | (1) Marine Biotechnology Laboratory, Korea Ocean Research and Development Institute, Ansan, P.O. Box 29, Seoul 425-600, Korea, KR |
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Abstract: | The endogenous rhythm of oxygen consumption in juvenile spotted sea bass (Lateolabrax sp.) was measured to test the effects of sudden changes in salinity on the metabolic activity. Mean oxygen consumption rates
of this euryhaline fish decreased by 13.5 to 16.0% and 25.3 to 36.4% when they were transferred from 31.5 to 15‰ seawater
and to fresh water (0‰), respectively. The maximum rate of oxygen consumption was observed between 18:00 and 19:00 hrs local
time, 1 to 2 h before sunset, even though they were kept in constant darkness. The peaks of oxygen consumption occurred in
23.2- and 23.3-h intervals, which correspond with a circadian rhythm, as revealed by maximum entropy spectral analysis. A
markedly weakened rhythm in oxygen consumption occurred from 8 to 10 d after onset of the experiments. This study indicates
that spotted sea bass can withstand sudden drops in salinity from 31.5‰ to fresh water, and yet maintain a regular though
somewhat dampened endogenous rhythm of oxygen consumption.
Received: 16 June 1997 / Accepted: 3 February 1998 |
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