Due to their charisma and popularity, bottlenose dolphins are often kept in captivity for research, conservation and education. Due to the dynamic social structure, aggressive interactions between dolphins can occur in the form of rough play or sexual occasions that cause rake marks on their body which are indicators of aggressive behavior. Environmental enrichment serves as a stimulation and encouragement of activities that improve the welfare of animals in captivity. In a dolphinarium in Mexico, a large number of rake marks on one dolphin in the group were noticed and plastic rings were introduced with the aim of reducing rake marks and thus reducing aggression. For research, the method of rake mark quantification determined the total number of rake marks in the absence and presence of rings, but also in each divided region separately for deeper analysis and purpose of rake marks. The results generally show a significant reduction in rake marks in the presence of rings, especially in ventral peduncle and belly area, as well as on the posterior side of the body in said dolphin. Therefore, rings can serve as a tool to reduce aggressive interactions and reduce sexual aggression. Furthermore, the results can be used to investigate dolphin aggression in a natural habitat, which gives importance to research in controlled environment and collaboration between researchers in controlled and natural environment. Although the results show that more research is needed due to the small sample of animals to further confirm the conclusions.