28 November 2003
Vol 302, Issue 5650

About The Cover

Cover image expansion

COVER Rainbow trout use only their anterior muscles when swimming between vortices in water flow (revealed here with bubbles), as described on page 1566. The assist that the fish get from the vortices supports a hydrodynamic explanation for fish distributions in schools and in current-swept habitats. [Image: J. C. Liao]