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2.1.21. Water pumping
To move water over the gills, teleost fish use a combined pumping action of mouth and opercular covers, aided by suitable valves to control the flow. The volume of first oral cavity is enlarged by lowering the jaw. Where as, in the second opercular cavity by movements of the opercular covers. |
Last modified: Tuesday, 20 March 2012, 8:34 AM