I enquired about fencing my pond and was told by two different council people that it didn't matter as the law was for swimming pools (for humans), and the subject of fish ponds was a grey area but they said I did not have to fence mine.
Besides, if we can have 2 rivers running, unfenced, through the middle of our town, plus a gorgeous one through a popular park (with a children's play area right beside it) again unfenced, then I don't see why I should have to fence something on my own private property! :evil: