Fish scale the surface, interacting only with the riblet tips, not causing any high-veloctiy flow in the valleys. Since this high velocity flow now only interacts with the riblet-tip, which is a very small surface area, the momentum transfer which causes drag is now much lower than before, thereby effectively reducing drag. Also, this reduces the cross-stream velocity fluctuations, which aids in momentum transfer too. The rough, sandpaper-like texture of shark and ray skin, coupled with its toughness, has led it to be valued as a source of rawhide leather, called shagreen. One of the many historical applications of shark shagreen was
Creatures from the Abyss "The Being". Creatures from the Abyss Creatures from the Abyss (original title Plankton) is a 1994 Italian b-movie directed by Al Passeri and written by Richard Bauman. The film starred Clay Rogers, Michael Bon, Sharon Twomey, Laura di Palma, Ann Wolf and infamous low budget movie director and actor Deran Sarafian. A group of five teenagers, three girls and two boys get lost in the ocean with a Dinghy and a big storm begins. Suddenly they spot a yacht sitting in the middle of the ocean and they go to investigate and to find shelter. But in fact the yacht