	Shonnard's 99-year lease began an era in which Walker's Cay was a well-known sport fishing location. One of Walker's Cay's seasonal residents was American businessman Robert Abplanalp, the inventor of the modern-day aerosol valve for spray cans. Abplanalp bought the lease on the island in 1968 and continued to develop it as a sport fishing destination, not neglecting to pay attention to the conservation of marine life; he began encouraging tag-and-release fishing in the early 1970s. Walker's Cay was particularly known as a location for billfishing, with huge Atlantic blue marlin caught in the area; angling for bonefish was also popular there.