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Handling-induced changes in haemolymph ammonia concentration and ammonia excretion rate of Crangon crangon (L.)
Hunter, D.A.; Uglow, R.F. (1993). Handling-induced changes in haemolymph ammonia concentration and ammonia excretion rate of Crangon crangon (L.). Ophelia 38(2): 137-147. dx.doi.org/10.1080/00785326.1993.10429895
In: Ophelia: International Journal of Marine Biology. Ophelia Publications: Helsingør. ISSN 0078-5326
Peer reviewed article  
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  • Hunter, D.A.
  • Uglow, R.F.
Abstract
    Physical manipulation (capture and handling) was found to have a significant effect on the haemolymph ammonia concentration and ammonia excretion rate of freshly-caught and laboratory-held Grangon crangon (L.) (Crustacea, Decapoda). In a Danish population of C. crangon a rapid increase of 40% (P < 0.05) in circulating ammonia during the first 7.5 min after handling was followed by a sustained (ca. 6 h) decrease. The haemolymph ammonia concentration 6.3 h after handling was 56% (P < 0.005) below the in situ value estimated for this population. Twenty-five hours after handling the circulating ammonia concentration had returned (P = N.S.) to the in situ value. In a British population of G. crangon a more rapid (ca. 6 h) return of circulating ammonia concentration to the estimated in situ value was a function of the maintenance ofinternalJexternal NH3 and NH4 + gradients during exposure to a gradually increasing seawater ammonia concentration. A 60% (P < 0.001) drop in the ammonia excretion rate of freshly-caught Danish C. crangon over the first 5.5 h after handling is attributed to a decrease in the release of ammonia from the tissues. These observations indicate that physical manipulation can affect crustacean nitrogen metabolism.
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