Example Image from Shad Cam

The Shad Cam is trained on the viewing window in the exit channel of the fishway. Fish seen on Shad Cam have successfully ascended the fishway and are about to re-enter the James River upstream of the dam.

  • The white background is 30 inches from the wet side of the 5-inch thick viewing window.
  • The camera lens is about 36 inches from the dry side of the window.
  • Fish position between the background and the window affects size estimation (forced perspective). Using background marks will tend to overestimate actual size while using glass marks will tend to underestimate actual size. Average the measurements for a rough estimate.