I bring you another gem from Mako; the speed ring.
After a successful shot, the Mako Speed Ring gets you back to hunting in a hurry. Designed to be used with a floatline, the speed ring allows you to quickly string your fish onto your floatline. Simply unclip the longline clip from the speed ring and insert the speed ring through the mouth of the fish and out the gills and then re-attach to the longline clip.
Notice this thread is not in the safety section, it's not that big a deal, but I want to tell a story that has to do with this. There may be a rare situation where I'd put a fish directly on the float line, because it's too big to put on the stringer or some other reason. In this case I run a loop into the fish's mouth and out the gills, then loop around the whole fish. But I wouldn't do it on a regular basis. The fish on the line create drag, the fish's teeth can damage the float line, or worse..
I was diving out of Homestead with a few guys and one had a Riffe speargun hat he just bought set up with a needle type stringer at the end of the float line, that would go through the breakaway hole at the back of the speargun and then stuck into a hole he drilled into the red butt. The stringer was well secured this way. As the diver would shoot fish he'd string them on the float line and let them drift back towards the float. At some point I was on the boat with the captain and we heard some yelling. Then saw this diver swimming real fast towards the boat. When he climbed aboard I could see he didn't have his gun. He said two big bulls appeared and were buzzing him so he ditched the gun to be able to swim fast back to the boat. We figured the gun was safe because we could see the float bobbing in the waves, so we took 10 minutes for him to calm down. Then I noticed that the float was much further off than where I first saw it, and we decided to go pick it up before it gets out of sight. When we got to the float and retrieved it there was no gun, the float line was cut. What happened was that the sharks went after the fish on the line and severed it. The Riffe C3 was never found. The fish were 2 or 3 ocean triggerfish.