One or both ends of the net are secured to an anchor.The net is spread closer to the surface of the sea and is used is bays,inlets,narrow waterways, or shallow points near the coast.The advantages are:it is suited for small fishing grounds,the ner form changes little while being spread,it can be moved to the course of the fish,one need not watch all night,etc.There are floating gill ners for sardine,macerel,flying-fish,salmon,trout,shark,etc.