Human impacts have led to increased levels of anthropogenic carbon within the atmosphere and the world’s oceans. The Biological Carbon Pump (BCP) plays a key role in reducing the amount of carbon in the atmosphere by aiding in the export and sequestration of carbon via carbon exchange between the atmosphere and the upper ocean followed by transfer into the deep sea. Mesopelagic fishes aid in this process of carbon transfer, and their influence can be analyzed through carbon flux models. Hatchetfishes are one of the most abundant fishes in the world with some species exhibiting diel vertical migration, but their role in the BCP has not been specifically studied. This study used individual-based carbon flux models based on the deep-sea hatchetfish Argyropelecus aculeatus to analyze the daily activities of individuals and estimate the carbon flux of these fishes. Individuals were categorized as either a migrator or non-migrator based on standard length. Previous diet studies have shown migratory prey present in the diet of non-migrating A. aculeatus which allows these individuals to contribute to the removal of anthropogenic carbon without migrating themselves. Utilizing these individual models, we were able to examine their potential contributions to the BCP within the Gulf. The results show that carbon flux estimates ranged between 2.18 ¹ mg C d^-1 for non-migrants and 5.64 – 6.41 ¹ mg C d^-1 for migrants, which is similar to lanternfish estimates using similar models. The two pathways contributing most to a total 24-hr carbon flux were the respiration and growth, and mortality pathways for both migrating and non-migrating A. aculeatus, both of which are quite poorly constrained for mesopelagic species.