Abstract
High‐resolution microvideograph observations supported the hypothesis that first filling of the gas bladder of larval walleye Stizostedion vitreum is accomplished by the fish penetrating the air‐water interface to gulp air, then transmitting a swallowed air bubble through the gut and the pneumatic duct to the gas bladder. The snout of the larva penetrated the water surface with extension of most of the mouth into the air for only 1.5 s. An air bubble (c. 100 μm) in the foregut was broken up into progressively smaller bubbles (10–15 μm), presumably by the combined effect of surfactant derived from the gall bladder and mechanical (peristaltic) action of the gut. These smaller bubbles seemed to be aligned in the pneumatic duct before being forced to the gas bladder by pressures generated from peristalsis.
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