My goldfish, Bob, Bob, Bob, Bob, Bob, Frank and Dave have all disappeared overnight. I'm assuming, tragically, that they have become somethings sushi dinner but what I can't work out is whodunnit or how... At least 80% of the water surface is covered by floating plants (primarily to protect from a local Heron). The water level hasn't dropped, there's no sign of plant disturbance. If it was the fox what dunnit, I'd have expected a scattering of plants and a lot of water displaced (it's a raised pool).If it was human fish-nappers I'd have expected them to also empty the potting shed of goodies en-route.
So I'm concluding aliens did it