Those who are interested in small boat hydrodynamics will enjoy the
video "Underwater World of Trout: Feeding Lies" which I borrowed
yesterday from the Ottawa public library. Closeup and slow motion
underwater video of trout riding stream current with little effort
while feeding are shown and explained. The function of body shape, all
the fins, positioning, etc. are shown. Edge and bottom eddies are
shown with the use of streamers tied to a stationary rod. Apparently
there has been a lot of scholarly scientific research done on the
hydrodynamics of trout. References are given. Very interesting video.