My ~1.66 acre pond has artificial habitats scattered within 20’ of the shore in 3-7’ of water. It is weed free. This means that there is at least 2/3rds of an acre that are more than 20’ from both shore & cover. Are those open water areas (maximum 10.5’) effectively ‘dead zones’ in terms of productivity?

For sake of argument, imagine a circular pond with a diameter of 210’ and a central depth of 10.5’ feet. Am I wasting real estate by not placing habitat in the inner 100’?