Application 124771 - Ministry of Fisheries

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CAWTHRON INSTITUTE | REPORT NO. 2134 MAY 2012 Table 2. Relative abundance of the most common epibiota observed from video transects at six control and eight reference farm sites in Coromandel (Abundance = A (> 20 per transect), Common = C (8-20 per transect), Occasional = O (3-7 per transect), Rare = R (1-2 per transect), Not observed = Blank). Con Con Con Con 1 Con 2 Con 3 4 5 6 Taxa EPIFAUNA Common Name Nth Nth Nth Sth Sth Sth Farm1 Farm2 Farm3 Farm4 Farm5 Farm6 Farm7 Farm8 Perna canaliculus Greenlipped mussel A A A O-A A A A A Coscinasterias muricata 11 arm seastars O O O O O O C-A Patiriella regularis Cushion star O O-C R O-C C R O O-A O-C O-C O O-C Stichopus mollis Sea cucumber O O O O O O R Styela clava Solitary ascidian O R C-A C O-C O R R Hydroida Small feather hydroid O O A A A A A A A A Pecten novaezealandiae Scallop R R R Atrina zealandica Horse mussel A C R O O O R Callyspongia sp. Finger sponge R Actinothoe albocincta White striped anemone R R R R EPIFLORA Benthic Diatom Mat Brown benthic film C C C C C C C C C C-A A C R C Codium sp. Green alga R Rhodophyta spp. Red algae O O O Carpophyllum sp. Brown alga R 19
MAY 2012 REPORT NO. 2134 | CAWTHRON INSTITUTE 20 5.5. Water column properties A snap-shot of water column properties at the reference farm and control sites using replicate CTD casts showed that the water column was well mixed at some reference farm and control sites, but that a weak thermo- and halo- cline (stratification of temperature or salinity) was present between 5-10 m at several sites (Figure 10). The greatest range in salinity and temperatures was observed in the top 5-10 m of the water column. The range in chl-a, measured as fluorescence, was similar between control and farm sites throughout much of the water column (Figures 11 and 12). Chl-a concentrations were centred on 0.1 µg/L throughout much of the water column, but were significantly higher at reference farm sites than control sites between 4-11 m depth (Figure 12). Water column turbidity (as Formazin Turbidity Units, FTU) was similar between farm and control sites in the top 3 m of the water column (Figure 11), but between 3-5 m farm sites were less turbid; and below 12 m, farm sites were more turbid. This could be attributed to filtration of the upper water column by mussels, and release of pseudo faeces toward the lower water column. In general, the top 10 m of the water column had the greatest variability in salinity and temperature, but no consistent patterns or differences were observed in chl-a. Wider-scale and longer-term monitoring and validated models will be necessary to provide a greater understanding of the contribution of aquaculture to water column properties in the Coromandel region.
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7. Relevant Planning Provisions 14
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16 the applicant is a member of the
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7.18 Policy 6.1.3 - (Integrated Man
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Appendix 1: Survey plan showing loc
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REPORT NO. 2167 COROMANDEL MUSSEL F
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CAWTHRON INSTITUTE | REPORT NO. 216
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Application 124771 - Ministry of Fisheries

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