Abstract
1. 1. Protein concentration in extravascular fluid is almost equal to plasma protein concentration in cod ( Gadus morhua) and flounder ( Pleuronectes platessa). 2. 2. The high extravascular protein concentration in fishes suggests a high capillary permeability to proteins, and thus, the effective colloid osmotic pressure across the capillary membrane is much less than that predicted by plasma protein concentration alone. 3. 3. Since protein permeability is high through their capillary membrane, polar fishes can tolerate substantial changes in plasma protein concentration without corresponding adjustments in blood hydrostatic pressure. 4. 4. Plasma protein retention in blood correlates directly with blood hydrostatic pressure on a comparative ascending scale in vertebrates: fishes, amphibians, reptiles, mammals and birds.
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