This short article and research shows how the food chain incorporates nanoplastics to the fish we eat and the fish we admire. This short story tells the troubling proof about the food chain bringing unwanted plastic to our food. 
 
"Researchers at the University of Eastern Finland have developed a novel, metallic fingerprint-based technique to detect and measure nanoplastics in organisms. In a recently published study, they applied the technique to a model food chain made of three trophic levels – where lettuce was the primary producer, black soldier fly larvae was the primary consumer and insectivorous fish (roach) was the secondary consumer. The researchers used commonly found plastic waste in the environment, including polystyrene (PS) and polyvinyl chloride (PVC) nanoplastics."
 
https://thefishsite.com/articles/insect-larvae-transfer-nanoplastic-part...