Much of this debate revolves around the nature of the water. If it's a water with only big and even bigger fish, ie, 20lb to 40lb plus, then there isn't much you can do to select the bigger ones. However, if we're refering to a water that has a very wide range of fish sizes, ie, single figure to 30lb-plus, then there are a number of things we can do, including not baiting a wide area to attract lots of fish, but presenting a very large hookbait amongst a small patch of feed.
in an area where the bigger fish frequent based on what past experience has taught us.