1. Ecofish Research Limited, Suite 1220−1175 Douglas Street, Victoria, British Columbia Canada
2. Environmental Research Institute, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand
3. Waikato Regional Council, Hamilton, New Zealand
4. Australian Rivers Institute, Griffith University, 170 Kessels Road, Nathan, Queensland 4111, Australia
5. AgResearch, Lincoln Science Centre, Private Bag 4749, Christchurch 8140, New Zealand
6. Soil and Physical Sciences, Faculty of Agriculture and Life Sciences, PO Box 84, Lincoln University, Lincoln 7647, Christchurch New Zealand