Application 124771 - Ministry of Fisheries

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CAWTHRON INSTITUTE | REPORT NO. 2134 MAY 2012 Unless they are used to calibrate ongoing wider-scale monitoring efforts (Inglis et al. 2000), it is generally considered that, due to significant temporal and spatial variability in water column properties, one-off synoptic samples are of little benefit to understanding the effects of aquaculture on the environment. In future, the synoptic data collected as part of this study may be used to validate wider scale water column modelling efforts. For example, an unvalidated model (courtesy of MetOcean Solutions Limited), shows depth averaged velocities across the study area and potential processes affecting mixing and water characteristics during incoming and outgoing tides (Figure 12). Peak velocities are estimated at in the main channel areas and inshore of small island groups to the north of Coromandel Harbour (red arrows Figure 12). In conjunction with the data collected here, future, long term and widerscale monitoring could be used to validate such models and assist in detecting widerscale and longer term trends in water column properties. 27
MAY 2012 REPORT NO. 2134 | CAWTHRON INSTITUTE 28 Incoming Tide High Tide Outgoing Tide Low Tide Figure 14. Depth averaged water velocities (colour scale in m s -1 ) from an unvalidated model of the study area on the Coromandel Peninsula at various tidal states in February 2000 (Courtesy of MetOcean Solutions Ltd.). Red arrows show peak flow areas behind islands to the North of Coromandel Harbour. 6.3. General conclusions In general, the effects of mussel farms on the benthic marine environment, in terms of enrichment and modification, have been found to be minor (Keeley et al. 2011), particularly when placed over primarily muddy substrata. Here we found that the effects to the benthic environment from Coromandel inshore mussel farms are similar, if not less, than in other areas of New Zealand. Therefore, providing the proposed additional 1 ha extensions (over and above the existing consented farm areas) are
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REPORT NO. 2167 COROMANDEL MUSSEL F
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Application 124771 - Ministry of Fisheries

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