At around the same time, South Africa introduced meshing to some of its most popular swimming beaches.When meshing began, approximately fifteen hundred sharks were caught in the first year.However, this declined in the years that followed, and since that time, the average annual catch has been only about a hundred and fifty a year.The majority of sharks are caught during the warmest months, from November to February, when sharks are most active and when both the air and the ocean are at their maximum temperature.Despite quite large catches, some people believe that shark meshing is not the best way to catch sharks.It's not that they think sharks are afraid of nets, or because they cat holes in them, because neither of these is true.But meshing does appear to be less effective than some other methods, especially when there are big seas with high rolling waves and strong currents and anything that lets the sand move - the sand that’s holding the nets down.When this moves the nets will also become less effective.