I get the occasional heron or egret and scare them off still a Gold fish sticks out like a sore thumb and is like a beacon from the air. I worry more about the Catfish and the Largemouth Bass.
Annette It is 6 foot at it's deepest and slopes in. most of my lillies are planted along the 2-3 foot section with the exception of the splatterdock it is 5 feet down, and it seems to like it there..
Andy