Skins of fish reduce drag by being covered by a slime layer of complex proteins, polysaccharides, and bacteria.
"Specific organisms can be targeted for specialized purposes. Slick 'no drag' hulls have been sought for centuries. The slickest surface is not a waxed or polished or Teflon surface, contrary to common belief. Using biomimicry, most fish have a clearly articulated slime layer of complex proteins, polysaccharides and bacteria. They are very fast and achieve this speed from the physical/chemical interface of water molecules with the surfaces of the bacteria and components which harbor either thinly affixed water molecules or compounds which have the appropriate hydrophilicity/hydrophobicity balance." (Guritza 2002:1)
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