Do bigger gills mean more oxygen?



  1. 0 Votes

    Yes. No. Well, sort of… Gills contain thousands of tiny capillaries (blood vessels), so as water passes over the gills, oxygen is absorbed directly into the bloodstream. Surface-area-to-volume ratio falls as animals get bigger. In other words, larger fish need larger or more intricate gills to absorb relatively equal amounts of oxygen as smaller fish with smaller gills.

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