That was a very beautiful pond and a nice garden too!
Too bad you lost the fish just the day after you missed stringing the fishing wire. I know how sad it is especially when you miss your loved ones.
I hope you are thinking positive. Be happy for being able to live with your fish during the past 2 years - even without any protection from the Herons as well! And I hope you consider this as a lesson and proceed with adding good protection for pond. Make your beautiful pond a home to a new lucky bunch of fish.
All the Best,
McoreD