DBoone -- I don't know where you are located, and how big your pond is. However, just speaking in general, I really don't like northern pike in a pond. Certainly, they will eat the larger size perch in your pond, and if pike get sufficiently abundant, they can even start to crop down your bluegills. So, I would consider removing them. They are indeed pretty aggressive, and while it may be tough to get all of them (depending on pond size), you can really get their numbers down by angling. They are very good to eat, especially in the winter. There is a special technique for getting out that extra line of y-bones in the fillets. However, once that is done, the fillets are firm and white!
