Catadromous-Diadromous and Anadromous Fishes - Research Article from Macmillan Science Library: Animal Sciences

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The Rigors of Making Freshwater-Saltwater Transitions

Diadromous fishes are of particular interest to physiologists because of the great challenges posed by freshwater-saltwater transitions. In particular, freshwater and saltwater environments make strikingly different demands on water-balance systems, so these fishes must make the necessary physiological adjustments whenever they pass from one type of aquatic habitat to the other. Every diadromous species migrates at least twice, once from freshwater to saltwater, and once in the other direction. Because of their ability to tolerate a variety of salinity regimes, diadromous species are also described as euryhaline, meaning "broadly salty."

Freshwater fish are in an environment in which they are hyperosmotic. That is, the concentration of salts and ions in their bodies is greater than that in the external aquatic environment. As a result, they have a tendency to lose important ions through diffusion across the skin and...

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This section contains 1,236 words
(approx. 5 pages at 300 words per page)
Buy the Catadromous-Diadromous and Anadromous Fishes Encyclopedia Article
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Macmillan Science Library: Animal Sciences
Catadromous-Diadromous and Anadromous Fishes from Macmillan Science Library: Animal Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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