What is ram ventilation?
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ram ventilation The production of respiratory flow in some fish in which the mouth is opened during swimming, such that water flows through the mouth and across the gills.
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Definition of Term. ram ventilation. (English) The extraction of oxygen during the passage of water over the gills owing to motion through the water rather than active, muscular pumping. Used by Echeneis naucrates when hitching a ride.
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