January 5, 1908–March 23, 2001

BY GENE E.LIKENS

ARTHUR DAVIS HASLER did pioneering limnological research across a broad spectrum of ecological subdisciplines from ecophysiology and behavior of fish to experimental manipulation of entire lake ecosystems. His work on the mechanisms whereby salmon find their way back from ocean feeding areas to home streams for spawning, for which he was best known, was not only brilliant and innovative but also provided a framework for management of these important fisheries throughout the world.

Hasler was born in Lehi, Utah, the second of four sons of Mormon parents, Walter Thalmann Hasler, a physician, and Ada Broomhead Hasler. His Mormon background played a significant and important role throughout his life, particularly regarding his active role in public service. He was among those who strongly advocated for acceptance of African-American membership in the Mormon Church.

He married Hanna Prusse in 1932, and they had six children: Sylvia, A.Frederick, Bruce, Galen, Mark, and Karl. Hanna was a trained vocalist (soprano) and music was a large part of the family’s activities. Hasler’s passions went far beyond science. His love of music and poetry was legend among his students and colleagues. He recited the works of Mörike, Heine, or Goethe at every opportunity and played