Acclimation to hypoxic water in facultative air-breathing fish: Blood oxygen affinity and allosteric effectors |
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| Affiliation: | 1. Department of Obstetrics and Gynecology, Bethune International Peace Hospital of PLA, Shijiazhuang, Hebei, China;2. Department of Urology, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, China;3. Department of Biochemistry and Molecular Biology, Hebei Medical University, Shijiazhuang, Hebei, China;4. Orthopaedic Trauma Department 2, The Third Hospital of Shijiazhuang, Shijiazhuang, Hebei, China;1. Environmental and Fisheries Sciences Division, Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 2725 Montlake Blvd East, Seattle, WA 98112, USA;2. School of Aquatic and Fishery Sciences, University of Washington, 1122 NE Boat St, Seattle, WA 98105, USA;3. Center for Reproductive Biology, Washington State University, PO Box 647521, Pullman, WA 99164, USA;4. Ocean Associates Inc., Under Contract to Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 2725 Montlake Blvd East, Seattle, WA 98112, USA |
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| Abstract: | - 1. Blood oxygen affinities, erythrocytic nucleoside triphosphate concentrations (NTP) and other hematological parameters were measured in facultative air-breathing fish from the Amazon after acclimation to well-aerated (“normoxic”) and hypoxic water (PO2 = 125–135 and 20–25 mm, respectively).
- 2. In the armored catfishHypostomus sp. andPterygoplichthys sp., hypoxia induces intermittent surfacing to gulp air and results in lower NTP levels, chiefly through significant decreases in guanosine triphosphate (GTP). The subsequent increases in blood O2 affinity appear adaptive to lowered time average internal O2 tensions. No similar changes were seen in the ellSynbranchus which breathes air almost continuously when kept in hypoxic water.
- 3. The results are discussed in terms of their adaptive significance, and compared with data on temperate fish.
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