User blog comment:D2r/Unanswered Questions of Redwall/@comment-174.70.39.218-20110425192803/@comment-74.235.12.154-20110426045636

My Grandparents own a man-made lake that is fed only by rainwater and was stocked with little fish and fish eggs when it was dug. This was nearly 90 years ago when this occured (360 seasons, in Redwall Time) and there are still plenty of fish in the lake, and it has never been stagnant due to rainwater replenishing it every now and again. Taking this as just one of many examples of how non-natural lakes' fish supply works, I would say that the answer that the Abbey Pond was stocked upon being built is almost certainly the correct one.