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Freshwater Update 35, July 2010
https://niwa.co.nz/freshwater/freshwater-update/freshwater-update-35-july-2010
Freshwater Update 54, July 2012
https://niwa.co.nz/freshwater-and-estuaries/freshwater-and-estuaries-update/freshwater/update/54
Freshwater Update 80, March 2019
https://niwa.co.nz/freshwater/freshwater-update/freshwater-update-80-march-2019