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Biol Bull 160: 376-382. (June 1981)
© 1981 Marine Biological Laboratory
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FISH MUCUS: IN SITU MEASUREMENTS OF POLYMER DRAG REDUCTION

THOMAS L. DANIEL 1

1 Department of Zoology, University of Wisconsin, Madison, Wisconsin 53706

The external layer of mucus on fish was investigated as a drag reducing polymer. Comparing velocity profiles for water flow over rainbow trout (Salmo gairdneri) and wax models of trout with and without hydrodynamically smooth surfaces revealed that the integumental mucous secretion can significantly reduce the rate of momentum transfer through the boundary layer. The difference in momentum transfer is expressed as a reduction in friction drag and discussed in view of the overall drag experienced by fish.

Submitted on January 19, 1981
Accepted on March 2, 1981






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Copyright © 1981 by the Marine Biological Laboratory.