Cho noted that there had been similar scientific efforts aimed at identifying the link between fish intake and melanoma risk, but their results were mostly inconsistent. On the other hand, their findings showed promise, but further investigation is still needed. 

“We speculate that our findings could possibly be attributed to contaminants in fish, such as polychlorinated biphenyls, dioxins, arsenic, and mercury,” Cho said. “However, we note that our study did not investigate the concentrations of these contaminants in participants' bodies, and so further research is needed to confirm this relationship.”

It is also worth noting that the fish intake of the participants was only calculated at the beginning of the research. Their consumption might have drastically changed in the course of the study, considering that the scope was 15 years. 

Another limitation was found in the lack of data on the risk factors for melanoma among the participants. Mole count, history of sunburn, sunlight exposure, and other behaviors might have given the findings more credibility. 

Despite the shortcomings, the study was still lauded for taking the first step in understanding the link between skin cancer and fish intake. Further research could help establish the association between the two.