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Swimming alters responses to hypoxia in the Adriatic sturgeon Acipenser naccarii

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When the Adriatic sturgeon Acipenser naccarii was exposed to progressive hypoxia under static conditions, it exhibited a linear decline in O2 uptake, behaving as an ‘oxyconformer’. When, however, it was allowed to swim at a low sustained speed, it could regulate O2 uptake down to a mean ±s.e. critical P- O 2 (Pcrit) of 4·9 ± 0·5 kPa (n= 6). At moderate levels of hypoxia, static fish exhibited significant reductions in arterial blood O2 content, and increases in plasma lactate, which were not observed in swimming animals.

Keywords: Acipenser; exercise; hypoxia; oxygen uptake; respirometry

Document Type: Research Article


Affiliations: 1: Marine Biological Laboratory, University of Copenhagen, Strandpromenaden 5, DK-3000, Helsingør, Denmark 2: College of Natural Sciences, Hawaii Pacific University, Kaneohe, HI 96744, U.S.A. 3: School of Biological Sciences, University of Wales Bangor, Gwynedd, LL57 2UW, U.K. 4: CESI Spa, Via Rubattino 54, 20134 Milano, Italy 5: School of Biosciences, University of Birmingham, Birmingham, B15 2TT, U.K.

Publication date: 2007-02-01

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