Growing plants using fish and circulating water. It's called aquaponics- a gardening system that combines hydroponics (water-based planting) and aquaculture (fish farming). It's been hailed as the future of farming: it uses less water (up to 90% less than traditional gardening). It doesn't attract soil-based bugs and produces two types of produce (both plants and fish).
US Airways Airbus A330 landing Manchester, UK on runway 05 Right.