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  Services » Publications » Technical reports - by year » tr200528

Trigger points for Wilson's bay marine farming zone

Report: TR05/28
Authors: Stephanie Turner, Malene Felsing

Abstract

This report provides a summary of the process followed by Environment Waikato to identify trigger points for the Firth of Thames and Wilson's Bay Marine Farming Zone in the eastern Firth of Thames. The report recommends the trigger points and the associated management responses that will be adopted by Environment Waikato to assist with the management of shellfish farming in the Wilson's Bay Marine Farming Zone.

The objectives of developing a trigger point framework was to identify the levels of key environmental variables, which may indicate that significant adverse effects are occurring as a result of marine farming, to aid the management of the Wilson's Bay Marine Farming Zone.

Environment Waikato believes that it is important that trigger points should be developed and implemented through a proactive and collaborative process involving resource managers, marine farmers and scientists. Environment Waikato also considers it essential that the trigger points and the associated management responses identified in this report should be further improved and refined over time as more information becomes available, and therefore intend implementing a 3-yearly review of the trigger points and the management framework, to ensure the process remains relevant and collaborative.

It is important to note that the trigger points described in this report are specific to the Wilson's Bay Marine Farming Zone, and that they cannot therefore be applied directly to other marine farming areas, or necessarily to results arising from utilising different sampling methodologies.

Trigger Points for Wilson's Bay Marine Farming Zone
(277 kb, 39 seconds to download, 56k modem)

Table of Contents

Executive summary iii
1 Purpose of report 1
2 Policy background 3
2.1 The Proposed Waikato Regional Coastal Plan 3
2.2 Trigger points 4
2.3 International context 5
3 Process for establishing and implementing trigger points 7
3.1 Process employed by Environment Waikato 7
3.2 The Limits of Acceptable Change planning framework 8
4 Proposed trigger points 9
4.1 Preliminary trigger points put forward for discussion in the NIWA 2002 report 9
4.1.1 Water column 9
4.1.2 Benthic community and the seafloor 9
4.2 Further development of preliminary trigger points put forward for discussion in the NIWA 2003 Report 11
4.2.1 Water column 11
4.2.2 Benthic community and the seafloor 11
4.2.3 Currents and wave action 13
4.3 Workshop discussions 13
4.3.1 Water column 13
4.3.2 Benthic community and the seafloor 15
4.3.3 Other potential trigger points 16
4.4 Trigger points - some important considerations 16
5 Trigger points - management responses 16
6 Recommendations 17
6.1 Trigger points 17
6.1.1 Water column 17
6.1.2 Benthic community and the seafloor 18
6.2 Management responses 18
6.2.1 Water column 18
6.2.2 Benthic community and the seafloor 22
6.2.3 How Environment Waikato proposes to implement management responses 25
6.3 Additional comments 25
6.3.1 Environmental monitoring 25
6.3.2 Future refinement of trigger points 25
6.3.3 Allocation of costs 26
6.3.4 Status of the trigger points 26
6.3.5 Trigger points specific to the Firth of Thames and Wilson's Bay Marine Farming Zone 27
References 29
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