Doohan,
Hey I would be willing to bet that if you have a Cormorant, that he won't stay very long. Most of the time they are passing by. Don't get me wrong a well stocked pond is a great source of food for them. I typically see them in larger lakes and retention ponds on a regular basis. Like everyone has said, there isn't a really good way to get rid of them that is legal. They say, "Dogs are mans best friend!" Good luck!