The Gray-Crown Rosy-Finch (GCRF) sub species dawsoni is an omnivorous native to the Sierra Nevada Mountains and breeds at the highest elevations in the alpine ecosystem. During the breeding season the juveniles of the GCRF have increased protein requirements and are primarily fed insects because they are high in proteins. In late spring when mayflies begin their reproductive life stage, emerge from alpine lakes, and take flight, the GCRF utilize this resource to drastically increase the rate at which they can feed their juveniles, which will often accompany the adults to these lakes. Trout, which were introduced to these naturally fishless lakes to provide recreational fishing, are voracious eaters of the native macroinvertebrate populations and may be taking away a vital insect resource from the GCRF. In this study I analyzed 27 different sites in the Sierra Nevada and White mountains looking at the number of trout caught per lake at each site, and the total number of GCRF observations over the last 5 years to determine if the presence of trout had any impact on the abundance of the GCRF. My results were not significant due to study limitations and the nature of the existing data that I was analyzing. I propose that the near-shore habitat type determines successful mayfly emergence in lakes containing trout, and mayflies as a food resource may be more or less significant based on the abundance of insects trapped on snowpack near nesting sites.