Oxygen-hemoglobin dissociation in Protopterus aethiopicus

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Abstract
An expedition was made in April and May of 1964 into the upper valleys of the White Nile to search for estivating P. aethiopicus. Because of floods, none was found. Temperatures of the waters and typical estivating areas were taken. The temperature of the river and lakes varied between 28 and 30 C, the wet med, 22 and 26. 5 C, and the dried mud 36. 5 and 40 C. Subsequently, 2 nonestivating fish shipped from Uganda were bled, the oxyhemo-globin dissociation curve established on both, and the Bohr effect of changing pCO2 on one. The dissociation curve favors release at high 02, tensions, and the Bohr effect is minimal. The curve suggests that in estivation in this fish, metabolism does not require support at low 02 tensions. Temperature tables, dissociation curves, and a Bohr effect graph are presented.

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