Competition for resources is a fundamental structuring process for most populations. Crowding within a population increases competition. The crowding experience by an individual can be increased by both density, which is the total number of individuals in an area, and aggregation, which is a metric of how close individuals are in space. Occasionally, individuals that experience strong aggregation do not grow as large as a result of competition. I studied the effect of intraspecific competition on the growth rates of the barnacle, Chthalamus fissus, found locally at Coal Oil Pointe Reserve. C. fissus are gregarious settlers, which means that their populations are typically heavily aggregated. Here, 1,366 barnacles were collected on plexiglass plates with seventy-five settling pits and placed into the laboratory where growth, in length, was measured on a monthly basis. Growth rates of barnacles that occurred in the same pit, thus experiencing strong aggregation and subsequent competition, were compared with those that settled individually. We initially anticipated that aggregation would negatively impact the growth rates of C.fissus, however, preliminary results show that there is no significant difference between the aggregated and individual barnacles.