Fish in Hatchery Pond

Salmon swim in the University of Washington fish hatchery pond. The concrete bottom goes out 7 m followed by a rocky bottom. The dark areas are the acoustic shadows of the fish.

Salmon swim in the University of Washington fish hatchery pond. The concrete bottom goes out 7 m followed by a rocky bottom. The dark areas are the acoustic shadows of the fish.
THIS IMAGE WAS CAPTURED BY OR FEATURES A DIDSON