This undated handout photo taken by Rick Stuart- Smith and released by the University of Technology Sydney on June 6, 2018 shows a diver taking notes underwater off the coast of Lord Howe Island in the Pacific ocean. .Conservation experts warned on June 6 of alarming falls in Australian fish populations and called for more marine reserves and better management to halt the declines. (Photo by Rick Stuart-Smith/AFP Photo/University of Technology Sydney)
