National Geographic : 1968 Mar
Spotlight on salmon secrets TRAVERSING TRACKLESS OCEAN, leaping waterfalls and dams, navigating by sensi tive smell and possibly sun and star, salmon race homeward to spawn. Guided by unerr ing instinct, each amazingly seeks out the stream of its birth. Here a courting pair of sockeye salmon guard a nest, or redd, of rocks in the Adams River, British Colum bia. Silver and blue in the sea, sockeyes turn crimson after entering fresh water. Last fall the U. S. Bureau of Commercial Fisheries set the stage for a new look at spawning behavior by adapting a special observation tank at Lovers Cove, Alaska. Biologist William R. Heard, right, glues stones together to create an artificial redd. Beneath it, veteran NATIONAL GEOGRAPHIC cameraman Robert F. Sisson appears at a glass panel through which he later made dramatic photographs of fish in the act of spawning. Watch for his remarkable pic tures in a comprehensive article on salmon by noted ichthyologist Dr. Clarence P. Idyll in a future issue of the GEOGRAPHIC. Your window on nature's world opens wide as NATIONAL GEOGRAPHIC photogra phers provide an ever closer view of life in the wild kingdom. Unfold new vistas for your friends by nominating them for mem bership on the form below.