The aglomerular kidney of the deep-sea gulper eel <Emphasis Type="Italic">Saccopharynx ampullaceus</Emphasis> (Saccopharyngiformes: Saccopharyngidae) |
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| Authors: | Chieko Ozaka Naoyuki Yamamoto Jørgen G Nielsen Hiroaki Somiya |
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| Institution: | 1.Laboratory of Fish Biology,Graduate School of Bioagricultural Sciences, Nagoya University,Nagoya,Japan;2.Zoological Museum, Natural History Museum of Denmark, University of Copenhagen,Copenhagen ?,Denmark;3.Department of Environmental Biology,Chubu University,Kasugai,Japan |
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| Abstract: | We report the presence of an aglomerular kidney in the pelagic deep-sea fish Saccopharynx
ampullaceus (Saccopharyngiformes: Saccopharyngidae). The thin kidney is unpaired and ribbon-like rostrally, while it is thicker caudally
with a rod-like shape. Light microscopic observation of serial sections revealed no glomeruli at all. The kidney is composed
of renal tubules, sinusoids and capillaries of the renal portal system and extensive interstitial lymphoid tissues. Each renal
tubule is surrounded by well-developed renal portal sinusoids, and the tubules are well separated from each other. There is
a large space dorsal to the vertebrae, similar to the situation in the closely related Eurypharynx pelecanoides. We consider that S. ampullaceus possesses an aglomerular kidney to gain neutral buoyancy. The urinary bladder of S. ampullaceus is a distinct vesicular structure, unlike that of E. pelecanoides. |
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