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The Head Kidney of Teleostean Fishes

Published online by Cambridge University Press:  11 May 2009

Extract

Until the year 1881, when Balfour wrote on the subject, the pronephros was generally believed to be a functional kidney, not only in the larval condition, but also in those adult forms described as possessing the organ.

Balfour, in his more detailed paper, published later, states that in the fishes examined—pike, eel, smelt, and angler—although the pronephros had all the appearance, externally, of a true functional kidney, no uriniferous tubules were present, and that a minute examination only disclosed a degenerate trabecular tissue which he describes as lymphatic.

The angler (Lophius), it may be observed, is generally considered to possess only a head kidney. This organ Balfour found to be in a perfectly functional condition, but he declines to believe that it is a persistent head kidney, and argues from the highly modified structure of the fish that the organ in question is in reality the mesonephros. shifted forward from its normal position. He also maintains that in adult Ganoids the head kidney has no longer a renal function. His general conclusion, therefore, is, that since the pronephros was only supposed to persist in Ganoids and Teloosteans, it must be now considered as non-existent except in the embryonic or larval conditions.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1891

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References

page 43 note * The Pronephros of Teleosteans and Ganoids, Brit. Assoc. Reports, 1881, p. 721.

page 43 note † Quart. Journ. Micros. Science, January, 1882.

page 43 note † On the Kidneys of Teleosteans, Brit. Assoc. Report, 1882, p. 577.

page 44 note * On the Swimming Bladder and Flying Powers of Dactylopterus volitans, Proc. Roy. Soc. Edin., vol. xvii, 1890.Google Scholar