Responses of the Fish Blennius pholis to Fluctuating Salinities

Blennius pholis (L.) were exposed to fluctuating salinity regimes of near tidal periodicity and their blood osmolality, oxygen consumption, heart rate and opercular beat monitored. Despite salinity fluctuations from 34-0-34 '/m S, the blood osmolality remained constant. Significant increases in oxygen consumption were observed at low salin~ty levels, but these may simply reflect changes in physical activity and the greater availability of oxygen at low salinities. Salinity effects upon heart rate/ opercular beat were weak or negligible.

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