counterflow system

counterflow system

the flow of water and blood in opposite directions across the gills of fish which ensures that blood meets water with the highest possible oxygen content. see COUNTERCURRENT EXCHANGE.
References in periodicals archive ?
"The zipper lane is a counterflow system. On Saturday, those going southbound enter the northbound side of C5 in Industria and go back to the southbound lane at Wilcon," he explained.
In particular, they have implemented the counterflow system in the postevisceration cleansing facility, to which so many American poultry producers have objected.