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...  By in | Earth | Human World on Nov 27, 2012  Man-made
nanoparticles in water slow fish down  Scientists think the
nanoparticles damage the fish’s gills, causing oxygen
deprivation in the internal organs including the brain.
Exposure to man-made titanium dioxide nanoparticles means trout
spend less time swimming at top speed, scientists have shown.
They think the particles damage the fish’s gills, causing oxygen
deprivation in the internal organs including the brain and
forcing them to save energy by cutting out rapid bursts of
movement.  Photo credit: Gabriel Pollard  The changes won’t have
much impact on the animals’ activity most of the time, but
affected trout may struggle to put on the sudden bursts of speed
that might be needed to flee a predator, fight a rival for the
chance to mate or catch elusive prey.  Other research by the
same group has shown that metals like copper can also stop the
trout reliably maintaining their proper daily