A barrier, such as a shark barrier, comprising a plurality of pylons spaced apart with respect to each other, and a mesh extending between the pylons wherein the mesh comprises a plurality of modules adapted to be attached to each other. In an arrangement the mesh is adapted to adjust to account for tidal changes and movement of water. The modules of the mesh may be pivotally attached to each other and the mesh may be adapted to selectively be displaced between an extended condition and a contracted condition.
