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Submitted on: 06 October 2004.
Revised on: 01 November 2004.
Accepted on: 15 November 2004.
NEW ZEALAND JOURNAL OF MARINE AND FRESHWATER RESEARCH
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Submitted on: 29 October 2009.
Revised on: 20 November 2009.
Accepted on: 08 December 2009.
NEW ZEALAND JOURNAL OF MARINE AND FRESHWATER RESEARCH
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