SkyTruth Fishing Watch. https://www.skytruth.org/mapping-global-fishing/

gCaptain reports,

Government ministers and delegates attended a conference by the Blue Justice Initiative, backed by 60 coastal states as of Thursday, including Brazil, South Africa, Norway and Indonesia, to jointly eradicate transnational crime in global fisheries.

The report gives a good overview of the size and difficulties of this problem that the Coast Guard is attempting to address not just in the US but globally.