Evaluating Translocation of the Apache Trout (Oncorhynchus apache) to Nonhistorical Renovated Streams

Abstract

Abstract Creeks in the Pinaleno Mountains of Arizona were renovated in the 1960s to remove nonnative salmonids, and were stocked with native Apache trout (Oncorhynchus apache). Cursory observations of distribution of fish following attempts to transplant have been reported, but following the Clarks Peak Fire of 1996 more thorough investigations of the aquatic communities were needed. In 1997, we sampled communities of fish with a backpack electrofisher and we collected aquatic invertebrates with a dip-net. Lengths of fish were recorded and scales were removed for assessment of age. We collected 398 putative Apache trout 60–257 mm in length and 0–3 years of age from four creeks, while four others contained no fish. Densities of invertebrates were variable and did not appear to be correlated with presence of fish or drainage. Translocation of Apache trout to Grant and Ash creeks has resulted in reproducing populations of trout with adequate densities and rates of growth to serve as potential future sources of fish for stocking. Marijilda Canyon and Big creeks also supported reproducing populations, but at a much lower density and may not be suitable as sources of fish for stocking. However, genetic information from these populations is needed to determine their suitability for service as replicate stocks.