We've enjoyed a pond for about 6 years in Berks County, Pennsylvania. I can't say I'm an avid hobbyist, but I really enjoy our pond. We have 13 fish, most in the 18" - 24" range. A blue heron found us towards the end of last summer, but so far we've been lucky and hope he doesn't return this year. I think we have a chance since he never scored a meal at our expense.
