Reduction of Gas Solubility in the Fish Swimbladder
The gas filled swimbladder serves many fish as a hydrostatic organ to achieve neutral buoyancy. The gas enters the bladder by diffusion from the swimbladder vessels. The high gas partial pressures necessary for establishing a diffusion gradient from the vessels to the swimbladder is achieved by reducing the solubility of gases in the swimbladder blood. This ‘single concentrating effect’ (Kuhn et al., 1963), the increase in gas partial pressure induced by a change in solubility, is then multiplied by countercurrent multiplication in the rete mirabile (Steen, 1970; Fänge, 1983).
KeywordsHC03 Concentration Root Effect Countercurrent Multiplication Physical Solubility Blood Metabolite Concentration
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