Plastic Piranhas

I really don't know why people are surprised to find plastic contaminants in the bodies of fresh-water, Amazonian fish (https://www.theguardian.com/environment/2018/nov/16/sad-surprise-amazon-fish-contaminated-by-plastic-particles). Given the duration and ubiquitousness of plastic use, I would be astounded if they weren't found in all living things in every location on the planet.