Over 460 million years ago the first jawless fish
swam in shallow seas of what was to become the Appalachian basin of North America.
ROSEBURG - A dam on the North Umpqua River has been modified to make the spawning migration easier for lamprey - a jawless fish
that is often mistaken for an eel.
For their experiments, Lau and Morgan used as a model organism the sea lamprey, which is a jawless fish
The sea lamprey, river lamprey and brook lamprey ( all kinds of jawless fish
( also find the weir impossible to negotiate as they migrate up stream to spawn.