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Biochemical and environmental perspectives on nitrogen metabolism in fishes

  • Multi-author Review
  • Ecological Implications of Metabolic Biochemistry
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Abstract

Catabolism of nitrogen-containing substances makes a major contribution to the oxidative metabolism in teleostean fishes. In this review, we focus on aspects of the formation, transport, detoxification and excretion of the two most important nitrogenous products of fishes: ammonia (NH3 plus NH +4 ) and urea. While NH +4 makes up the bulk of nitrogenous waste, it is in equilibrium with the highly toxic NH3. Ammonia is generated in the liver and excreted through branchial, surface and renal routes. Innocuous urea is derived through hepatic uricolysis or argininolysis and voided through kidney, gill, skin or faeces. Under conditions hampering the release of ammonia, such as exposure to exogenous ammonia, water limitation, or alkaline conditions, some teleosts detoxify ammonia through synthesis of urea by the ornithine-urea cycle in liver. Ammonia and possibly alanine are the prevalent vehicles of internal nitrogen transport. Glutamine is immaterial to interorgan nitrogen transport in fishes, but plays a transient role in the detoxification of ammonia by brain glutamine synthetase.

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  1. Department of Biochemistry and Microbiology, University of Victoria, P. O. Box 3055, V8W 3P6, Victoria, British Columbia, Canada

    T. P. Mommsen

  2. Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida, USA

    P. J. Walsh

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Mommsen, T.P., Walsh, P.J. Biochemical and environmental perspectives on nitrogen metabolism in fishes. Experientia 48, 583–593 (1992). https://doi.org/10.1007/BF01920243

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