Na + /H + and Cl -/HCO 3 -exchanges in the branchial epithelium are thought to be primarily responsible for acid-base transfers in fish. Several different cellular mechanisms have been proposed to drive these exchanges in fresh water and marine species. We measured the acidbase balance and net H + t
Mechanisms of Ammonia Excretion Across Fish Gills
β Scribed by Michael P. Wilkie
- Book ID
- 114215912
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 563 KB
- Volume
- 118
- Category
- Article
- ISSN
- 0300-9629
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## Abstract In fresh water fishes, ammonia is excreted across the branchial epithelium via passive NH~3~ diffusion. This NH~3~ is subsequently trapped as NH in an acidic unstirred boundary layer lying next to the gill, which maintains the bloodβtoβgill water NH~3~ partial pressure gradient. Whole a
Varying the concentration of un-ionized ammonia (NH,) in the medium perfusing the gills of the isolated fish head while holding the total ammonia (NH,' + NH,) concentration constant had no significant effect on gill ammonia excretion. In contrast, alteration in the medium NH,+ concentration at a fix