Excretion of urea by two teleosts exposed to different concentrations of ambient ammonia

K. R. Olson, P. D. Fromm

Research output: Contribution to journalArticle

85 Scopus citations


1. 1. When rainbow trout were subjected to increased ambient ammonia they excreted decreased amounts of ammonia nitrogen and total waste nitrogen. 2. 2. Ammonia-N, urea-N and protein-N accounted for an average of 94 per cent of total nitrogen excreted by trout. 3. 3. Except for a slight increase in urea excretion at very low ambient ammonia levels the rate of urea and protein excretion by trout remained constant throughout the range of ammonia levels tested. 4. 4. Trout acclimated to 5 μg ammonia/ml showed no increase in urea excretion above that of fish acclimated to 0·5 μg/ml. 5. 5. Goldfish subjected to increased ambient ammonia levels showed an increase in urea excretion rates. 6. 6. The rate of urea excretion by goldfish was dependent on the 24-hr experimental ammonia levels but was not affected by the concentration of ambient ammonia during acclimation or the duration of acclimation.

Original languageEnglish (US)
Pages (from-to)999-1007
Number of pages9
JournalComparative Biochemistry and Physiology -- Part A: Physiology
Issue number4
StatePublished - Dec 1 1971
Externally publishedYes


  • Ammonia
  • Carassius auratus
  • Salmo gairdneri
  • goldfish excretion
  • teleost excretion
  • trout excretion
  • urea

ASJC Scopus subject areas

  • Physiology

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