In terms of plastic pollution in the Pacific, CA Choy has published on plastic particles in the stomachs of pelagic fish (http://www.int-res.com/abstracts/meps/v485/p155-163), and we published on microbial diversity and metabolism on plastic pieces in the Pacific Plastic Patch (http://scope.soest.hawaii.edu/pubs/2016Bryant_mSystems.pdf).
There is also a review from 2002 on plastic debris http://derraik.org/resources/Publications/003.Derraik_2002-Mar_Poll_Bull.pdf
Take a look on our paper https://www.researchgate.net/profile/Joao_Frias/publication/257107890_Resin_pellets_from_beaches_of_the_Portuguese_coast_and_adsorbed_persistent_organic_pollutants/links/5469d8720cf20dedafd11d06/Resin-pellets-from-beaches-of-the-Portuguese-coast-and-adsorbed-persistent-organic-pollutants.pdf and references associated :)
Check this : Marine Pollution Bulletin (2018). Low prevalence of microplastic contamination in planktivorous fish species from the southeast Pacific Ocean.