Voices and lots of them. Until now the driving forces behind new shark fishing regulations that would require vessels to come back to port with shark carcass, as well as fins, have been NGO's.
It is time for regular folks to step up to the plate. Once in a long while do issues like these come up for debate, discussion and action.
Make your voice heard. It is estimated that forcing near worthless shark carcass to return with shark fishing vessels in EU waters will curtail upwards of 30% of this out of control fishery. That's an excellent start.
Read Oceana Shark Report 2007
Kudos to Chumslick for the image.