I have heard El Niño is causing fish to migrate but was really surprised to hear that corals have bleached that much in Hawaii.
http://dlnr.hawaii.gov/blog/2015/09/11/nr15-135/
http://www.theguardian.com/us-news/2015/sep/13/hawaii-coral-bleaching-scientists-predict-worst-ever
http://www.latimes.com/opinion/op-ed/la-oe-helvarg-coral-reef-bleaching-20151101-story.html
http://dlnr.hawaii.gov/blog/2015/09/11/nr15-135/
http://www.theguardian.com/us-news/2015/sep/13/hawaii-coral-bleaching-scientists-predict-worst-ever
http://www.latimes.com/opinion/op-ed/la-oe-helvarg-coral-reef-bleaching-20151101-story.html