The herring swimbladder as a gas reservoir for the acousticolateralis system

Abstract
The herring, Clupea harengus, in common with other clupeoids, has ducts between the swimbladder and the exterior and has no apparent gas secretion organs. Experiments under pressure show that the central regions of the swimbladder wall are very compliant and collapse as the fish moves deeper in the sea, leaving the end sections patent. Gas is thus always held where it is available to maintain the gas-filled bulla system.