Abstract
1. 1. A new method is described for obtaining cardiograms of aquatic organisms, giving information about the energetics of the osmoregulating process. 2. 2. A positive correlation was found between the difference in osmotic concentration between blood and medium and the heart rate in two osmoregulating and one osmoconforming shrimp species. 3. 3. Rapid temperature changes result in adaptive changes in the heart rate of the osmoregulator Palaemon serratus, which were absent in the osmoconformer Lysmata seticaudata. 4. 4. Instability of temperature and salinity in the habitat is—in the species studied—accompanied by the presence of mechanisms to stabilize blood concentration and heart rate.
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