Ultraviolet Light and Catalyst Help Improve Land-Raised Salmon

Erik Stokstad in Science magazine describes attempts in Wisconsin to raise salmon in land-based fish farms including the use of UV light and a titanium catalyst to improve water quality and ultimately salmon taste. Excerpt: NORTHFIELD, WISCONSIN—When drivers on Highway 94 pass this tiny town, some are struck by a mysterious nocturnal glow. Pink light emanates from the world’s largest aquaponic greenhouse, which can produce up to 2 million kilograms of salad greens each year. Less obvious, but also unique at this scale, is the source of the nutrients used to fertilize the crops: wastewater flowing from huge nearby…