Application 124771 - Ministry of Fisheries

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CAWTHRON INSTITUTE | REPORT NO. 2134 MAY 2012 5. RESULTS 5.1. Sediment physical and chemical properties Sediments sampled from within the eight reference farms and six control sites contained varying amounts of silt and clay (< 63 µm), sand (< 2 mm and > 63 µm) and gravel-sized (> 2 mm) components (Figure 4, see Appendix 2 for raw data). No clear patterns in sediment particle grain-size components relating to area (north or south of Coromandel Harbour) or site type (‘control’ versus ‘farm’) were evident. The majority of sites within the region had only small gravel components, and only four sites had an average gravel component of 20% or more (Control sites 1 and 4 and Farm sites 1 and 6). A different suite of sites had sand components greater than 30% of their total dry weight (Control sites 2 and 4 and Farm sites 2, 6 and 7), and it was these same sites that had silt components that were less than 50% of their total dry weight. At all other sites, the majority of the sediments (> 50%) were comprised of fine muddy silts (< 63 um). Observations made from video footage (see Section 5.4), were consistent with these results, where fine silt/mud was the most common substratum, even at control sites. Sand/shell dominated substrata were only observed at a small number of control and farm sites. Sediment cores at the majority of reference farm and control sites were characterised by a fairly uniform light grey/brown colour and appeared well oxygenated, with poorly defined aRPD layers that ranged between 40 and 60 mm below the seafloor (see Appendix 2 for images). No sulphide odours were detected. Total nitrogen (TN) was significantly higher in sediments collected from under farms than at control sites (site type, F1, 38 = 7.98, p
MAY 2012 REPORT NO. 2134 | CAWTHRON INSTITUTE Figure 4. Average sediment grain-size (percentage of dry weight), total nitrogen (TN, mg kg -1 dry weight) and total organic carbon (TOC, percentage of dry weight) for control and farm sites to the north and south of Coromandel Harbour. 10
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Contents 2 Contents ...............
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4 marine farm (which expires on 1 J
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6 2011) identified that the aquacul
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8 Goodwin E, 2012. Assessment of Be
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10 4.5.8 The capacity of the wharf
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12 in Appendix 1 and designed in ac
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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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