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Journal of Experimental Biology 60,547-556 (1974)
Published by Company of Biologists 1974

Drinking Rate and Oxygen Consumption in the Euryhaline Teleost Aphanius Dispar in Waters of High Salinity

E. SKADHAUGE 1 and R. LOTAN 2

1 Institute of Medical Physiology A, University of Copenhagen
2 Department of Zoology, Hebrew University Jerusalem

1. The drinking rate and the oxygen consumption were measured in Aphanius in sea water (SW) at 17, 20 and 24.5 °C and at 20 °C in 2-fold and 31/2-fold SW. Both untrained (shocked) and trained fish were used. In this species shock was observed to reduce the drinking rate.

2. In trained fish the drinking rate was 11.0±1.0 µl/g.h (mean±S.E.) in SW at 20 °C. The oxygen comsumption was 346±16 µl O2/g. h. These parameters were not significantly changed in 2 SW and 31/2 SW.

3. At 17 °C both drinking rate and oxygen consumption were reduced, and at 24.5 °C were increased.

4. The results suggest that adaptation to waters of high salinity primarily involves a reduced effective osmotic permeability of the integument (the gills) and an increase in the transport rate of NaCl by the intestine, roughly proportional to the salinity.

Submitted on September 17, 1973




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© The Company of Biologists Ltd 1974