There has been an exciting development regarding international fisheries law.  It’s an Advisory Opinion delivered by the International Tribunal for the Law of the Sea in April this year on, amongst other things, IUU fishing.  For an introduction, see the following short paper by Tim Stephens:

http://www.asil.org/insights/volume/19/issue/8/itlos-advisory-opinion-coastal-and-flag-state-duties-ensure 

For more information, see the website of ITLOS at:

https://www.itlos.org/en/cases/list-of-cases/case-no-21/