A study of the occurrence and potential risks of microplastics in fish and shellfish of Hong Kong

Microplastic pollution has been recognized as a significant problem in Hong Kong. Microplastics contained in the marine environment and aquatic products can accumulate in the human body through the food chain and cause adverse effects. However, the risks associated with the consumption of aquatic products have not yet been fully elucidated. This study assessed the microplastic contamination in 9 different commercial fish and shellfish from Hong Kong. Microplastic particles were found in both organ and flesh samples, where higher concentrations were found in the organs. Among all the species we tested, mussel exhibited the highest microplastic content in the flesh. The dominant types of microplastics detected were polystyrene (PS) and polyethylene (PE), which were commonly used in disposable food packaging. Cell models were used to evaluated the potential toxicity of the MPs. It was found that the integrity of intestinal barrier remained unaffected, while MPs in geoduck and mussel showed higher cytotoxicity with increased necrotic rate of intestinal cell. Besides, MPs from mussel exhibited the highest hemolytic activity, posing a potential risk to red blood cells. These findings highlighted the presence of MP contamination in fish and shellfish of Hong Kong and its potential risks to human health.