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Aspects of blood physiology and ammonia excretion in Nephrops norvegicus under hypoxia
Hagerman, L.; Søndergaard, T.; Weile, K.; Hosie, D.; Uglow, R.F. (1990). Aspects of blood physiology and ammonia excretion in Nephrops norvegicus under hypoxia. Comp. Biochem. Physiol., Part A Physiol. 97(1): 51-55
In: Comparative Biochemistry and Physiology. Part A. Physiology. Pergamon: Oxford, U.K.. ISSN 1096-4940, more
Peer reviewed article  

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Keywords
    Ammonia; Blood; Environmental effects; Excretion; Hypoxia; Nephrops norvegicus (Linnaeus, 1758) [WoRMS]; Marine

Authors  Top 
  • Hagerman, L., more
  • Søndergaard, T.
  • Weile, K.
  • Hosie, D.
  • Uglow, R.F.

Abstract
    Circulating haemocyanin, glucose, lactate, and ammonia concentrations and ammonia excretion rates of Nephrops norvegicus were studied in normoxia and in various hypoxia levels for periods up to 3 weeks. Increases in circulating glucose and lactate took place in oxygen tensions PwO2 = < 30 Torr only, indicating aerobic metabolism down to this oxygen tension. In moderate hypoxia, N. norvegicus synthesised haemocyanin; in more severe hypoxia some haemocyanin catabolism occurred. Mean normoxic blood ammonia concentration was 130 mu M NH4+/l with large individual variation. Blood ammonia levels decreased with time in both normoxia and hypoxia showing a lowered metabolic rate over the experimental period. Mean ammonia excretion rate was 0.16 mu M NH4+ g/wet wt/hr under normoxia.

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