I had a beautiful pond full of goldfish at the front door the kids tipped a container of perfumed talcum powder in there, they died a slow death but they smelt nice
we fixed up a half wine barrel as apond this summer with 4 big comets. rather nice spot to enjoy brekkie or an evening beer. not bad nvestment $16 for fish,barrel from tip, plants from a swamp.$10 for a years supply of food