The spiny dogfish Squalus acanthias L. maintains osmolyte balance during long-term starvation

M. Kajimura, P. J. Walsh, C. M. Wood

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Over 56 days of starvation, spiny dogfish Squalus acanthias lost c. 0.3% body mass per day and condition factor and hepato-somatic index declined, but plasma osmolality levels remained higher than seawater levels for the entire period; major osmolytes in the plasma, such as urea, trimethylamine oxide and inorganic ions did not change appreciably. Urea was always the dominant nitrogen waste and was excreted at a constant rate over the 56 day starvation period, suggesting that a minimum rate of urea loss to the environment is unavoidable. Significant amounts of unknown-nitrogen compounds were also excreted at rates higher than that of ammonia. The dogfish can maintain its osmolytes constant despite losing large amounts of nitrogen-rich urea, and therefore maintains plasma hyperosmotic regulation over long-term starvation.

Original languageEnglish
Pages (from-to)656-670
Number of pages15
JournalJournal of Fish Biology
Volume72
Issue number3
DOIs
StatePublished - Feb 1 2008

Fingerprint

Squalus acanthias
starvation
urea
plasma
inorganic ions
trimethylamine
hepatosomatic index
nitrogen compound
nitrogen
nitrogen compounds
condition factor
osmolality
body mass
oxides
ammonia
seawater
oxide
ion
rate

Keywords

  • Elasmobranch
  • Nitrogen excretion
  • Osmotic balance
  • Starvation
  • Urea

ASJC Scopus subject areas

  • Aquatic Science

Cite this

The spiny dogfish Squalus acanthias L. maintains osmolyte balance during long-term starvation. / Kajimura, M.; Walsh, P. J.; Wood, C. M.

In: Journal of Fish Biology, Vol. 72, No. 3, 01.02.2008, p. 656-670.

Research output: Contribution to journalArticle

Kajimura, M. ; Walsh, P. J. ; Wood, C. M. / The spiny dogfish Squalus acanthias L. maintains osmolyte balance during long-term starvation. In: Journal of Fish Biology. 2008 ; Vol. 72, No. 3. pp. 656-670.
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