Relationship between phosphorylated metabolic intermediates and whole blood oxygen affinity in some air-breathing and water-breathing teleosts

1 April 1978

journal article
Published by Canadian Science Publishing in Canadian Journal of Zoology

Vol. 56 (4) , 887-890
https://doi.org/10.1139/z78-123

Abstract

The relationship between whole blood oxygen affinity and erythrocyte (RBC) organic phosphate composition of three species of air-breathing teleosts (Lepidosiren paradoxa, Electrophorus electrocus, and Synbranchus marmoratus) and three pairs of closely related air-breathing and water-breathing fishes (Arapaima gigas vs. Osteoglossum bicirrhosom, Hoplerythrinus unitaeniatus vs. Hoplias malabaricos, and Pterygoplichthys sp. vs. Pseudoplatystoma sp.) have been studied.Packed cell volumes, hemoglobin concentrations, whole blood P₅₀'s, and total erythrocyte phosphates are higher in air breathers than in water breathers.GTP and ATP are the predominant organic phosphates in the erythrocytes of all of the species studied except A. gigas, which contains inositol pentaphosphate as the major organic phosphate at a level of 1.8 μmol/cm³ RBC or 39% of the total cell phosphate.

Keywords

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