Physostome

Physostomes are fishes that have a pneumatic duct connecting the gas bladder to the alimentary canal. This allows the gas bladder to be filled or emptied via the mouth. This not only allows the fish to fill their bladder by gulping air, but also to rapidly ascend in the water without the bladder expanding to bursting point. In contrast, fish witho...
Found on http://en.wikipedia.org/wiki/Physostome

physostome

(from the article `mechanoreception`) ...to minute increases or decreases in pressure (for example, to a few millimetres of water pressure), indicating that they have a most refined sense ...
Found on http://www.britannica.com/eb/a-z/p/63

physostome

physostome, physostomi, physostomatous, physostomous Fish that have a pneumatic duct leading from the air bladder to some part of the alimentary canal (usually the esophagus); they include members of a number of suborders and the name is no longer used in systematic classification. —A Dictionary of Zoology by A. W. Leftwich (London: Constabl...
Found on http://www.wordinfo.info/words/index/info/view_unit/1662/
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