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Journal of Experimental Biology 151,161-173 (1990)
Published by Company of Biologists 1990

Blood Respiratory Properties and the Effect of Swimming on Blood Gas Transport in the Leopard Shark Triakis Semifasciata

N. CHIN LAI ¹, IEFFREY B. GRAHAM ¹, and LOUIS BURNETT ²

¹ Physiological Research Laboratory, A-004, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093
² Department of Biology, University of San Diego Alcala Park, San Diego, CA 92110, USA

Changes in vascular pressures, blood respiratory properties and blood gas transport induced by swimming were investigated in the leopard shark Triakis semifasciata (Girard). In resting sharks, the mean ventral and dorsal aortic pressures (systolic/diastolic) were 6.8/5.6 kPa and 4.5/3.9 kPa, respectively, and only the former were increased significantly during swimming. Swimming also caused a significant decline in venous Po₂ (1.6 to 0.9kPa), O₂ content (0.9 to 0.4mmoill^-1) and percentage O₂ saturation {SO₂, 39 to 18%) but the arterial variables were not affected. A significant decline in venous pH and an increase in venous Po₂ also occurred during swimming but lactate concentration did not increase during or after swimming. An in vivo dissociation curve compiled from blood Po₂ and So₂ data for sharks in the resting, swimming and post-swimming recovery phases shows a mean P₅₀ of 2.04 kPa, as determined by Hill transformation. The pH-bicarbonate plot for this fish shows a weak blood buffer capacity of 9.3mmoll^-11pHunit^-1 and during swimming the average blood pH and bicarbonateconcentration follow the buffer line which was not compensated in recovery. Neither oxygenated nor deoxygenated blood pH values were affected by CO₂ equilibration, suggesting the absence of a Haldane effect. Thus, at the expense of respiratory acidosis, Triakis can aerobically sustain long (up to 60min) and moderately intense (0.45 Ls^-1, where L is body length) periods of swimming by increasing cardiac output and tapping its venous reserve. Introduction Most vertebrate circulatory

Key words: Triakis semifasciata, swimming, vascular pressures, blood gas, blood lactate, Haldane effect

Accepted on March 8, 1990

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