Occasional Papers of the Museum of Zoology
OCCASIONAL PAPERS OF THE MUSEUM OF ZOOLOGY UNIVERSITY OF MICHIGAN NOTES ON THE CUTTHROAT AND RAINBOW TROUTS WITH THE DESCRIPTION OF A NEW SPECIES FROM THE GILA RIVER, NEW MEXICO THE trouts of western North America have long provided rec- reation to the outdoorsman and perplexing problems to the systematic ichthyologist. The notorious variability of these fishes, in coloration as well as in body form and meristic char- acters, has led to the recognition of no less than 33 nominal species, many of them based on only 1 or a few specimens (Jordan, Evermann, and Clark, 1930: 56-59; Snyder, 1933, 1934, 1940). It is probable that the status of a number of these forms may never be securely clarified. The endless transplantation of stoclcs, with much interbreeding in hatcher- ies and in nature, has made it extremely difficult, often im- possible, for the specialist to identjfy specimens with assur- ance. Many stocks have been either extirpated or greatly modified through alterations of the environment and through the widespread stocking of exotic forms, which often eliminate the native trout or hybridize with them. A few species seem to have been exterminated. The emerald trout of Pyramid Lake, Nevada (Map I), Salmo smaragdus Snyder, rare even 35 years ago, is almost surely extinct. The royal silver trout, Salmo regalis Snyder, a species confined to the deep waters 2 Robert Rush Miller Occ. Papers of Lalre Tahoe, California and Nevada (Map l), has not been taken for many years and is presumed to be extinct. Angling enthusiast Richard S. Croker, of the California Division of Fish and Game, has assured me that Salmo everma~zniJordan and Snyder, which once abounded above the falls of Santa Ana River in southern California (Map I), disappeared about 1935, when he caught what may have been the last pure sample of this interesting species.
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