Abstract
Changes in diuresis and renal excretion of ions were studied in the lampreyLampetra fluviatilis L. after an intramuscular injection of 20 ml of the 1 × 10− 6 M arginine vasotocin solution. The experiments were carried out underin vivo conditions maximally resembling the natural ones. In the free-swimming lampreys, the urine was collected through the catheter inserted into the ureter. The arginine vasotocin injection was shown to produce in the lamprey an increase in excretion of sodium ions by 3.6 times (p < 0.05), of potassium ions, by 2 times (p < 0.05), and in diuresis, by 1.6 times (p < 0.05), with no effect on the magnesium ion excretion. The data obtained are of interest for studies on peculiarities of the effect of vasotocin in vertebrates at the earliest stages of the evolution of osmoregulatory processes.
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