Hendrickson's first samples in 1978 of the undescribed and amazingly diverse species of trout native to the Sierra Madre Occidental (SMO) of northwestern mainland Mexico (Sonora, Chihuahua, Sinaloa and Durango) immediately engaged his interest. In the 1990s he began inviting others to join him on collecting trips and the diverse group of Méxican and U.S. collaborators that now goes by the name "Truchas Mexicanas" quickly took shape. For more than 2 decades now, that group has worked toward improving knowledge of fishes, especially trout, throughout the SMO.
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