The Pacific Ocean currents passing Japan go to California before they get to the vicinity of Viet Nam.
I haven’t heard of any massive fish kills washing-up on the shores of California.
https://www.youtube.com/watch?v=s2tIAx8kUIA&feature=youtu.be&t=3465
https://www.youtube.com/watch?v=s2tIAx8kUIA&feature=youtu.be&t=885
http://www.kptv.com/story/26142551/millions-of-dead-anchovies-wash-ashore-in-oregon-coast-town
http://www.cbs8.com/story/21840275/seaworld-rescues-9-more-sea-lions-this-weekend
http://articles.latimes.com/2013/apr/01/local/la-me-stranded-sea-lions-20130402
http://www.cbsnews.com/news/toxic-algae-bloom-in-pacific-ocean-could-be-largest-ever/
They can attribute die-offs to algal blooms but can’t explain the algal blooms. Lots of whale strandings - emaciated whales.