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Fish Respiration: Oxygen Delivery and Adaptations to Anoxic Conditions

Explore how fish obtain oxygen, the mechanisms they use for respiration, and how they cope with low oxygen levels. Learn about the effects of pH, temperature, and hemoglobin on oxygen affinity. Discover adaptations and the impact of high water temperatures on fish. Understand anoxia and the role of hemoglobin in revealing vertebrate bloodlines.

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Fish Respiration: Oxygen Delivery and Adaptations to Anoxic Conditions

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  1. October 8, 2008 How do fish get oxygen to their peripheral parts? What other types of mechanisms do fish use for respiration? How do fish deal with anoxic conditions?

  2. A. B.

  3. Higher pH Med. pH Lower pH Med. pH Higher pH Lower pH Sacramento blackfish rainbow trout Species differ in magnitude of Bohr & Root effects. More active species have bigger shifts & higher P50s (Hb lower affinity for O2)

  4. As temperature increases, O2 decreases.

  5. Hemoglobin shifts right with increases in temperature.

  6. Questions for review. Why do fish need hemoglobin? What is P50? Why does Hb (hemoglobin) have a saturation curve? Why doesn’t it all just bind at a certain [O2]? 2. Define the Bohr effect and the Root effect. What is their role in respiration? Why is the pH lower (and acidity higher) at the tissues? Which critical processes happen at the gills and which happen at the tissues? Draw the Hb saturation vs. PO2 curves for “loading” at the gills and “unloading” at the tissues. What pattern do we see across fishes with respect to Bohr effects & oxygen affinity (P50)? How do they help unload O2? 5. What types of adaptations do fish have to deal with low O2 in the environment? 6. Why is high water temperature so stressful for fish? Name 2 reasons. 7. What is anoxia and how do fish deal with it? 8. How does hemoglobin help reveal vertebrate bloodlines? (book question)

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