Abstract
Histological investigation was carried out to clarify the distribution of renal juxtaglomerular (JG) cells in the shortnosed sea horse Hippocampus brevirostris known as one of the aglomerular teleosts. The fish were obtained at the Zoological Station of Naples. The kidney tissues from 10 specimens were fixed in Helly's fluid and Bowie's method was applied to tissue stain-ing for light microscopy. In all aglomerular teleosts examined hitherto, the location of JG cells is limited to the inside of the renal parenchyma, though the pattern of distribution shows variation according to species. On the contrary, JG cells in the sea horse were not detected within the renal parenchyma. But they are present as clusters of Bowie-positive cells in the extrarenal connective tissue between the parenchymal portions. This is the first document on the unique distribution of JG cells in the extrarenal region.
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