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

Kenneth Olson, P. D. Fromm

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

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
Volume40
Issue number4
DOIs
StatePublished - Dec 1 1971
Externally publishedYes

Fingerprint

Ammonia
Urea
Trout
Goldfish
Nitrogen
Acclimatization
Oncorhynchus mykiss
Fish
Fishes
Proteins

Keywords

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

ASJC Scopus subject areas

  • Physiology
  • Molecular Biology
  • Biochemistry

Cite this

Excretion of urea by two teleosts exposed to different concentrations of ambient ammonia. / Olson, Kenneth; Fromm, P. D.

In: Comparative Biochemistry and Physiology -- Part A: Physiology, Vol. 40, No. 4, 01.12.1971, p. 999-1007.

Research output: Contribution to journalArticle

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