Cressi Speed Needle
The Cressi Speed Needle is used to thread your fish onto your floatline. It is one of the fastest and easiest ways for stringing fish.
Every speargun should have a float line attached to their handle which should be attached to a float. The aim of the speed needle is to minimise the effort after catching a fish. This is where the Cressi Speed Needle comes in to play.
Once you have the fish in your hands, instead of swimming back to the float to place your catch there, you instead unclip the speed needle from your spear gun, thread it through the fish mouth and out through its gill. Then clip the speed needle back on and off you go to catch another.
When you swim off to start looking for your next target, the fish you have just placed on to your float line will be taken by the current up the line to the float. Its extremely simple yet saves a lot of time when spearfishing.