There is no shortage of scientific studies documenting the degradation of the world's oceans, the decline of marine ecosystems and the collapse of important fish species.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/oceans-risk-many-studies-little-action
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/international-herald-tribune-bangkok
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/marine-ecosystems
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/marine-life
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/oceans-and-seas
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fish
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fisheries
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/research