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Unformatted text preview: swim by undulating movements of their body Mouth - takes in food and allows a stream of water over the gills. Nostril - a blindly ending sac with organs of smell. Dorsal and ventral fins - reduce rolling motion during swimming and help in turning movements Tail fin - imparts final thrust in swimming movements Operculum - covers and protects gills and lets water escape from them Lateral line - a tube running the length of the body just below the skin. It is filled with a jelly like liquid and has sensory nerve endings. It is a sense organ which responds to changes in pressure, e.g. movements in the water nerve jelly-filled tube sensory nerve endings openings to surface body wall D.G. Mackean pectoral fin pectoral and pelvic fins - help to steer and stabilise fish Lateral line...
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- Fall '11