Abstract
1. The effect of pressure change on Physostomatous fish Synodontis schall was studied. This fish was not affected by either compression or decompression (quick or slow). Adjustment to the new pressure takes place either by swallowing or releasing of gas bubbles into or from the swimbladder, which suggests that Synodontis schall lives near the air water interface in order to replace gas lost from the swimbladder. 2. In many experiments the fish died when the water was supersaturated with gas after decompression. 3. The average ratio of the swimbladder of Synodontis schall was on the average 0.82. A figure which appears to be near to that recorded for other Nile fishes. 4. The average carbohydrate, fat and lipid contents of the swimbladder of Synodontis schall was 31.2; 67.0 and 1.70 mg respectively.
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