Abstract
THE nature of the changes of hydrostatic pressure produced in the buccal and opercular cavities by the breathing movements of teleost fishes has been discussed by several workers1–3. Pressure measurements were made by Woskoboinikoff and Balabai4, but their results give no indication of the time-course of these changes. Using a capacitance manometer, we have been able to measure pressure changes in both buccal and opercular cavities throughout the complete respiratory cycle in three species of freshwater fish. Ciné films taken simultaneously made it possible to plot the movements of the mouth and operculum without loading these structures in any way. The action of the mouth and opercular valves was also studied from the films.
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References
van Dam, L., “On the Utilization of Oxygen and Regulation of Breathing in some Aquatic Animals” (Gröningen 1938).
Henschel, J., J. Cons. Int. Explor. Mer., 14, 249 (1939).
Woskoboinikoff, M. M., Zool. Jahrb., Abt. Anat., 55, 315 (1932).
Woskoboinikoff, M. M., and Balabai, P. P., Acad. Sci. RSS. d'Ukraine, Trav. Inst. Zool. et Biol., 16, 77 (1937).
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HUGHES, G., SHELTON, G. Pressure Changes during the Respiratory Movements of Teleostean Fishes. Nature 179, 255 (1957). https://doi.org/10.1038/179255a0
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DOI: https://doi.org/10.1038/179255a0
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