The Ucluelet Aquarium is engaged in research on microplastics in the ocean, on the beaches, and in the sand of our beaches. They are producing information on their findings in regular reports - and below is attached one of their recent reports. It is significant in that they are studying pieces of plastic that are not readily visible in the water or on the beach, but which are increasingly showing up in the marine food chain.
Read about it below - you can click and download as per the instructions - if you have a Mac, you will have to download the file to your "downloads" folder then open it. Alternately, some computers will load the file directly by clicking on it.