Do you see it? Along the bottom?
In case you didn't know, Salmon eggs are laid in gravel 'nests' in mountain streams. The eggs that aren't swept down stream or eaten, hatch and spend several weeks in their nest area growing bigger. They live in the mountain stream for 10 to 11 months and then head downstream to live in the ocean for 3-4 years. When they are ready to reproduce they head back to the exact stream where they were hatched. Dams and electric power plants have created obstacles for the fish - both going up and down stream. When dams are built, precautions are taken to try to shuttle most fish heading downstream away from the turbines, and fish ladders are constructed to provide a means for the fish to return from the ocean to the stream or hatchery where they began their lives.