Gill netting is a common method of fishing, designed to allow only the fishes head to go through the net. When the fish tries to escape, their gill cover gets caught, entangling them in the net. There are two methods of gill net fishing, one is a set net that will be anchored into the water to the desired depth to stop any movement of the net. The other is a drift net which is kept afloat in the sea with buoys, tied to the boat and left to drift with the waters current.
