Contents

02 March 1988
Vol 239, Issue 4845

About The Cover

Sockeye salmon, among the most economically important fish species in the world, migrating from their ocean feeding grounds to spawn and die in freshwater (Adams River, British Columbia). Relative aquatic productivity of oceans and freshwaters has probably played an important role in the evolution of such spectacular movements by fishes. See page 1291. [Photograph by Marj Trim, courtesy of the Department of Fisheries Canada and Douglas & McIntyre Ltd.]