Why? Because poor Tanzanian fishermen are using explosives, illegally, to kill hundreds of fish in seconds.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/tanzania-horrific-fishing-tactic-destroys-all-sea-life
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/national-geographic-news
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biodiversity
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fisheries-0
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/marine-life
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/marine-ecosystems
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tanzania
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment-crime
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/corals
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa