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  Services » Publications » Technical reports - by year » tr200824

Natural Character and Visual Impact Assessment of Potential Finfish Farming Development

Report: TR 2008/24
Author: Bernard Brown Associates Ltd



Environment Waikato is considering a plan change to the Regional Coastal Plan that will enable fish farming and other new types of aquaculture in the existing Aquaculture Management Areas (AMA) located offshore from Wilson Bay, and the Coromandel Peninsula.

Bernard Brown Associates has been engaged to undertake a Natural Character and Visual Impact Assessment of the proposed fish farming aquaculture activities. As a baseline assessment, the study is required to compare full development of mussel farming aquaculture in the existing AMAs with potential fish farming activities. The study focuses on the greatest concentration of marine farms on the Peninsula’s west coast from Wilson Bay to Amodeo Bay.

Existing mussel farming activities in the Waikawau/Wilson Bay coastal environment are located in Area A of the Wilson Bay Marine Farming Zone sited 1.5 kilometre off shore. The mussel farm activities generate visual effects caused by buoys, barges and navigational lighting. The buoys (the actual farms) are generally innocuous and their presence in the CMA is signified by the barges working the farms.

Existing mussel farm activities in the Coromandel/Motukawao coastal environment are randomly located throughout the CMA often in close proximity to the mainland and islands shoreline. The Coromandel sub unit is in a delicate balance with respect to any additional mussel farming activities being developed in this area.

There are two key variables that affect the ability of the marine environment to visually absorb mussel farming activities. These include:

a) the scale of the receiving coastal environment and the degree of visual interest in the view.

b) elevation and distance viewed.

The vast scale of the Waikawau/Wilson Bay coastal environment provides high visual absorption capability, sufficient to accommodate full development of mussel farming expanding into Area B of the Wilson Bay Zone without causing adverse effects on natural character values.

In the Coromandel coastal sub unit additional mussel farms would have a significant visual impact and should not be allowed unless those effects can be remedied or mitigated. A precautionary approach is recommended for this area.

Based on a model fish farm using circular sea cages, fish farming will have increased visual effects compared to mussel farming activities. This is primarily due to their characteristic vertical structural elements. Viewing distance (for example 5km offshore) is considered a key visual mitigation measure. When considering the location of fish farming in the Wilson Bay Zone, Area B is the preferred location for large scale (50 hectares or more) fish farming activities from a visual impact perspective

Fish farming activities would assimilate best when seen in conjunction with existing mussel farming activities. Established mussel farming activities would form the foreground, provide context and mitigate the effect of additional fish farm structures.

To maintain and protect the natural character values of the coastal environment fish farming activities should avoid high visual audience areas where close views are gained.

Natural Character and Visual Impact Assessment of Potential Finfish Farming Development
(379 kb, 54 seconds to download, 56k modem)

Table of Contents

  Executive Summary iii
1 Assessment methodology 1
2 Coastal environment context and characteristics in the study area 2
2.1 Description of the Waikawau/Wilson Bay landscape unit 3
2.2 Description of the Coromandel/Motukawao landscape unit 4
3 Visual effects of existing aquaculture activities including the expansion of mussel farming into Area B of Wilson Bay 6
3.1 Existing AMAs and mussel farming locations in the Waikawau/Wilson Bay and Coromandel/ Motukawao coastal environments 6
3.2 Factors Influencing the degree of visual effects generated by existing mussel farming activities 8
3.2.1 Primary Visual Effects of Mussel Farms 8
3.2.2 Variables affecting the ability of the marine environment to visually absorb mussel farming activities 8
3.3 Summary of the visual effects of mussel farming in the study area 12
3.3.1 General 12
3.3.2 The Waikawau/Wilson Bay coastal environment 12
3.3.3 The Coromandel/Motukawao coastal environment 12
4 Potential landscape and visual effects of proposed fish farming aquaculture activities in the existing AMAs 14
4.1 Possible fish farming aquaculture structures 14
4.2 Comparison of the visual effects of fish farm activities with existing mussel farm activities in the study area 15
4.3 Summary of 5ha, 50ha and 150ha fish farming scenarios in the study area 16
5 Conclusions and key principles 17
Appendix 1 Viewpoint locations 19
Appendix 2 Definition of terms used 20
Appendix 3 Terms of Reference 21
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