Over six days (the first weekend of each November) in 2007-2009, groups of bowfishers removed 5,709 invasive koi carp from the Waikato River and its lakes. Generally disposed of in a large mulcher, these fish weighed a total of 13,930 kilograms. Part of Wayne Barrar's exhibition "Bio Borders: Plants and Animals in a Globalised Landscape" Photographs courtesy the artist