Houston Turner,
No, the diving ducks are different...they don't do enough harm to worry about IMHO...in fact, I just leave them alone. I don't even mind the herons we get. I kind of like them around.
The Cormorant, aka water turkey is an entirely different matter. Count yourself fortunate, indeed, if you don't have these pests. The water turkey is a fish eating machine, perfected by Nature and sometimes protected by Humans.
