This is footage of a fishing boat longlining for swordfish in the Med. Their hooks and technique are resulting in the slaughter of really small, immature swordfish.
It’s painful to watch, and worth remembering next time you are considering ordering or eating swordfish. The demand you create, even if your swordfish comes from a mature fish, is creating the demand that leads to this. So maybe it’s time to stop eating swordfish, or charging a price that reflects the destruction of the species that is ongoing.
No matter what sorts of regulations and sustainable principles are applied to fisheries, the Iron Law Of Fishing (and humanity) is: if it makes money it will be done.
The Earthist Chronicles 
There’s a TV program about Long line fishing (Swords) but we only see the big ones they pull in.