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Post-prandial blood flow to the gastrointestinal tract is not compromised during hypoxia in the sea bass Dicentrarchus labrax

Michael Axelsson^1,*, Jordi Altimiras¹ and Guy Claireaux²

¹ Department of Zoology, University of Göteborg, Box 463, S-405 30 Göteborg, Sweden
² CREMA-L'Houmeau, (CNRS-IFREMER), France

View larger version (62K): [in a new window]   Fig. 1. Ventral view of a vascular cast showing the origin of the celiaco-mesenteric artery in a 360 g sea bass. REBA, right efferent branchial arteries (I and II, III, IV); LEBA, left efferent branchial arteries (I and II, III, IV); DA, dorsal aorta; CMA, coeliacomesenteric artery.

View larger version (19K): [in a new window]   Fig. 2. Effects of a stepwise decrease in water oxygen partial pressure (PO2) on cardiac output (), heart rate (fH) and stroke volume (VS) before (open columns) and after feeding (filled columns). Values are means ± S.E.M. (N=7). Asterisks indicate a significant difference between control (unfed) and fed group, daggers indicate significant differences from previous hypoxia level.

View larger version (21K): [in a new window]   Fig. 3. Effects of a stepwise decrease in water oxygen partial pressure (PO2) on absolute (GI) and relative (GI/) gastrointestinal blood flow before (open columns) and after feeding (filled columns). Values are means ± S.E.M. (N=7). Asterisks indicate a significant difference between control (unfed) and fed group, daggers indicate significant differences from previous hypoxia level.