Abstract
— High resolution microcinematography demonstrates that larval walleye, Stizostedion vitreum penetrate the air-water interface. This observation supports the assumption that some physoclistous fish gulp air for first filling the gas bladder. Furthermore, a air bubbles were observed in the gut. Muscular contractions were observed that positioned and pressed a microbubble against the ventral edge of the gas bladder where it disappeared within a few minutes. This observation supports the assumption that gulped air is transmitted through the pneumatic duct to the gas bladder. These observations provide the first direct evidence of gas bladder inflation in a larval perciform fish. * Current address: Mead & Hunt, Inc., 6501 Watts Road, Suite 101, Madison, WI 537191361
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