Hatch Variables

During heavy hatches the fish may hold just below the surface; consequently, this restricts their vision window. When hatches are sparse fish can hold deeper so that they can view a wider area looking for insects. Moreover, deeper holding fish can see you better. Also, during heavy hatches, fish become less cautious because they are preoccupied feeding. The longer a hatch persists the less wary the fish becomes. It can be easier to closely approach fish late in a heavy hatch than earlier in the same hatch.