IN THE MATTER of the Resource Management Act 1991 · deployments of Acoustic Doppler Current...

D A Nolan / J D K Gardner-Hopkins Phone 64 4 499 9555 Fax 64 4 499 9556 PO Box 10-214 DX SX11189 Wellington

IN THE MATTER of the Resource Management Act 1991

AND

IN THE MATTER of a Board of Inquiry appointed under section 149J of the Resource Management Act 1991 to consider The New Zealand King Salmon Co. Limited's private plan change requests to the Marlborough Sounds Resource Management Plan and resource consent applications for marine farming at nine sites located in the Marlborough Sounds

SUPPLEMENTARY DOCUMENT OF FIGURES AND TABLES – FOR THE EVIDENCE PROVIDED BY BENJAMIN ROBERT KNIGHT IN RELATION TO

WATER COLUMN EFFECTS FOR THE NEW ZEALAND KING SALMON CO. LIMITED

JUNE 2012

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Supplementary Document Of Figures And Tables – For The Evidence Provided In Relation To Water Column Effects Of Benjamin Robert Knight For The New Zealand King Salmon Company Limited, June 2012

Figure 1. The nine salmon farm sites proposed in the current plan change application (red dots),

existing NZ King Salmon farm sites (black triangles) and one NZ King Salmon farm site

currently under appeal (open circle; Melville Cove, Port Gore).

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Table 1. Relevant properties of each Sound used to estimate tidal residence times (= 12.43/24 x 2

x Volume of the region at low water spring (LWS)/Tidal Volume; Heath 1976) and critical

nutrient loading limits. * Tidal Range values shown are from Heath (1976) and calculated

independently for this study.

Surf.

area

Tidal range*

(m)

Tidal volume.

(106 m3)

Volume

of the

region

at LWS4

Euphotic

volume5

Tidal

residence

time (days)

Region (km2) Spring Neap Spring Neap (106 m3) (106 m3) Spring Neap

Pelorus Sound1 385 2.37 1.46 912 562 9200 5462 10.44 16.94

Inner QC Sound2 68 1.4 0.5 95 34 1747 1045 19.03 53.18

All QC Sound3 305 1.4 0.5 427 152 9100 4864 <23.27 <65.37

Port Gore6 48 2 0.5 96 24 961 772 10.36 33.32

1 Pelorus Sound is considered to be the region south of Paparoa and Culdaff Point, excluding the region east of Allen Strait. 2 Inner Queen Charlotte Sound is considered to be the region east of West Head and Dieffenbach Point, excluding the region east of Allen Strait. 3 Due to the two entrances of the outer region of Queen Charlotte (QC) Sound, the estimated tidal residence time is likely to be overestimated. 4 Volume has been calculated using charted data depth interpolated to an unstructured triangular mesh for all regions. 5 Euphotic volume is used for comparison to a critical nutrient loading rate (CNLR) and has been calculated using the lower of the depth to the seabed or a seasonally averaged euphotic depth (19 metres from Beatrix Bay, Pelorus Sound, Gibbs & Vant 19971). 6 Port Gore is considered to be the region south of a line between Cape Lambert to Cape Jackson, tidal ranges considered to be equivalent to Pelorus Sound. Tidal range data for this region are estimated based on outputs from the NIWA Tide Forecaster.

1 Gibbs MM, Vant WN 1997. Seasonal changes in factors controlling phytoplankton growth in Beatrix

Bay, New Zealand. New Zealand Journal of Marine and Freshwater Research 31 (2): 237-248.

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Table 2. Water flow conditions and approximate depth beneath proposed farm sites. Current

speeds are depth-averaged values calculated from data collected during 30 day

deployments of Acoustic Doppler Current Profilers (ADCPs). HF = High Flow, LF = Low

Flow.

Site Flow Depth averaged

current speed (cm s-1) Depth (m)

Pelorus Sound

Kaitira (KAI) HF 19.5 60

Richmond Bay (RIC) HF 12.7 32 - 40

Taipipi (TAP) HF 14.5 62

Waitata Reach (WAT) HF 19.5 63

White Horse Rock (WHR) HF 11.9 30

Queen Charlotte Sound

Ngamahau (NGA) HF 22.3 23-35

Ruaomoko (RUO) HF 29.1 50

Kaitapeha (KAP) HF 10.4 60

Port Gore

Papatua (PAP) LF 3.7 35

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Table 3. Relative magnitudes of existing nitrogen sources (finfish, riverine and oceanic) and sinks

(mussel harvests and denitrification) for the Pelorus Sound region. Note that loss of

nitrogen through burial or organic export is unknown. Q relates to the quantity or rate,

with the units expressed in the respective rows of the table.

Inputs

Quantity

or feeding

rate (Q)

kg N per Q

Total

nitrogen1

(tonnes

N/yr)

References

Waihinau Bay

(currently fallowed) 3 kt Feed/yr 56 + 168

Gowen & Bradbury

19872

Forsyth Bay 3 kt Feed/yr 56 + 168 Gowen & Bradbury

19872

Crail Bay (combined) 3 kt Feed/yr 56 + 168 Gowen & Bradbury

19872

Pelorus/Rai Rivers + 477 WRENZ 20103

Kaituna River + 83 WRENZ 20103

Manaroa + 9.0 WRENZ 20103

Tuna Bay + 6.3 WRENZ 20103

Crail Bay + 2.3 WRENZ 20103

Waitaria + 2.5 WRENZ 20103

Net oceanic exchange

(DIN) + 4200

Updated analysis of

NIWA data assuming

full tidal mixing and

exchange.

2 Gowen RJ, Bradbury NB 1987. The ecological impact of salmonid farming in coastal waters: a review.

Oceanography and Marine Biology 25: 563-575. 3 WRENZ 2010. NIWA Water Resource Explorer New Zealand, data retrieved from

http://wrenz.niwa.co.nz (November 2010).

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Table 3. continued.

Inputs

Quantity

or feeding

rate (Q)

kg N per Q

Total

nitrogen1

(tonnes

N/yr)

References

Losses/Removals

Mussel farming N

removal 45 kt/yr 5.9 - 266

Zeldis 20084; MFA

2010

Denitrification 386 km2 1205 - 465

Kaspar et al. 19855;

Christensen et al.

20036

Nitrogen burial Unknown

1 Note that oceanic exchange estimates refer to DIN rather than total N.

4 Zeldis J 2008. Exploring the carrying capacity of the Firth of Thames for finfish farming: a nitrogen

mass-balance approach NIWA Client Report: CHC2008-02. 28 p. 5 Kaspar HF, Gillespie PA, Boyer IC, MacKenzie AL 1985. Effects of mussel aquaculture on the nitrogen

cycle and benthic communities in Kenepuru Sound, Marlborough Sounds, New Zealand. Marine Biology 85 (2): 127-136

6 Christensen PB, Glud RN, Dalsgaard T, Gillespie P 2003. Impacts of longline mussel farming on oxygen and nitrogen dynamics and biological communities of coastal sediments. Aquaculture 218 (1-4): 567-588.

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Table 4. The relative magnitudes of existing nitrogen sources (finfish, riverine and oceanic) and

sinks (mussel harvests and denitrification) for the Queen Charlotte Sound region. Note

that several nitrogen inputs and exports, including major oceanic fluxes, are estimated for

this region based on a basic comparison to Pelorus Sound.

Inputs

Quantity or

feeding rate

(Q)

kg N

per

Q

Total

nitrogen

(tonnes

N/yr)

References

Te Pangu Bay1 5 kt Feed/yr 56 + 280 Gowen & Bradbury

19877

Otanerau Bay 3 kt Feed/yr 56 + 168 Gowen & Bradbury

19877

Ruakaka Bay 3 kt Feed/yr 56 + 168 Gowen & Bradbury

19877

Clay Point2 3.5 kt Feed/yr 56 + 196 Gowen & Bradbury

19877

Picton wastewater + 9 pers. estimate

Terrestrial Inputs + 16.6

pers. estimate based

on freshwater inputs

from Heath 19768

Net oceanic

exchange (DIN) + 1650

pers. estimate

assuming

comparable with

Pelorus Sound and

proportional to tidal

exchange volume3.

7 Gowen RJ, Bradbury NB 1987. The ecological impact of salmonid farming in coastal waters: a review.

Oceanography and Marine Biology 25: 563-575. 8 Heath RA 1976. Broad classification of New Zealand inlets with emphasis on residence times. New

Zealand Journal of Marine and Freshwater Research 10 (3): 429–444.

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Table 4. continued.

Inputs

Quantity or

feeding rate

(Q)

kg N

per

Q

Total

nitrogen

(tonnes

N/yr)

References

Losses/Removals

Nitrogen burial Unknown

Mussel farming N

removal

~2000 GWT

harvested 5.9 - 11.80

Zeldis 20089; MFA

201010

Denitrification 305 km2 1204 - 367

Kaspar et al. 198511;

Christensen et al.

200312

1. A consented staged increase of up to 6000 tonnes has been granted to the Te Pangu Bay Site. 2. A consented staged increase of up to 4000 tonnes has been granted to the Clay Point Site. 3. Queen Charlotte Sound is ~39% of the Pelorus Sound mean tidal exchange volume (Figure 1).

9 Zeldis J 2008. Exploring the carrying capacity of the Firth of Thames for finfish farming: a nitrogen

mass-balance approach NIWA Client Report: CHC2008-02. 28 p. 10 MFA 2010, Marine Farming Association Fact Sheet, retrieved from

http://www.nzmfa.co.nz/industryinfo.asp (November 2010) 11 Kaspar HF, Gillespie PA, Boyer IC, MacKenzie AL 1985. Effects of mussel aquaculture on the nitrogen

cycle and benthic communities in Kenepuru Sound, Marlborough Sounds, New Zealand. Marine Biology 85 (2): 127-136

12 Christensen PB, Glud RN, Dalsgaard T, Gillespie P 2003. Impacts of longline mussel farming on oxygen and nitrogen dynamics and biological communities of coastal sediments. Aquaculture 218 (1-4): 567-588.

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Table 5. Table showing nitrogen waste calculations based on present feed used in the

assessment and possible low protein FCR combinations. Note the potential for large

reductions in DIN emissions, if protein content of feeds and/or the feed conversion ratio

(FCR) is able to be reduced in future.

Description Present

feed

Low

protein

Low

FCR

Low

protein

and FCR

FCR 1.7 1.7 1.5 1.5

Percentage protein in feed 45% 35% 45% 35%

Feed N

(kg/tonne of feed, 16% N in Protein

- Stead and Laird, 200213)

72 56 72 56

Fish N (kg retained/tonne of fish,

Bromley and Smart, 198114) 27.20 27.20 27.20 27.20

Feed N (kg/tonne of fish produced) 122.40 95.20 108.00 84.00

Lost TN (kg per tonne fish) 95.20 68.00 80.80 56.80

Lost TN (kg per tonne feed) 56.00 40.00 47.53 33.41

Faeces production

(kg/tonne fish, 26% - Butz & Vens-

Cappell, 198215)

442 442 390 390

N % in Feaces (Penczak et a.l

198216) 4% 4% 4% 4%

Faeces N lost (kg per tonne of fish) 17.68 17.68 15.6 15.6

DIN excretion (kg per tonne of fish

produced) 77.52 50.32 65.20 41.20

DIN excretion (kg per tonne of

feed) 45.60 29.60 43.47 27.47

% Reduction in DIN emissions

per fish production unit 35% 16% 47%

13 Stead SM, Laird LM 2002. Handbook of salmon farming. Springer Praxis, Chichester, UK. 14 Bromley PJ, Smart G 1981. The effects of the major food categories on growth, composition and food conversion in rainbow trout (Salmo gairdneri Richardson). Aquaculture 23 (1-4): 325-336. 15 Butz I, Vens-Cappell B 1982. Report of the FIFAC Workshop on Fish-Farm Effluents., Denmark. 113-121 p. 16 Penczak T, Galicka W, Molinski M, Kusto E, Zalewski M 1982. The enrichment of a mesotrophic lake by carbon, phosphorus and nitrogen from the cage aquaculture of rainbow trout, Salmo gairdneri. Journal of Applied Ecology 19 (2): 371-393.

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Table 6. Typical water column characteristics for different trophic states, as summarised by Smith

et al. (1999)17 and based on the review by Håkanson (1994)18. TN= total nitrogen, TP=

total phosphorous, Chl= Chlorophyll-a (chl-a), SD= Secchi disc depth (a measure of water

clarity).

Trophic

state

TN

(mg/m3)

TP

(mg/m3)

Chl

(mg/m3)SD (m)

Oligotrophic <260 <10 <1 >6

Mesotrophic 260-350 10-30 1-3 3-6

Eutrophic 350-400 30-40 3-5 1.5-3

Hypertrophic >400 >40 >5 <1.5

17 Smith V, Tilman G, Nekola J 1999. Eutrophication: impacts of excess nutrient inputs on freshwater, marine, and terrestrial ecosystems. Environmental pollution 100 (1-3): 179-196. 18 Håkanson L 1994. A Review on Effect Dose Sensitivity Models for Aquatic Ecosystems. Internationale Revue der gesamten Hydrobiologie und Hydrographie 79 (4): 621-667.

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Table 7. Mean (Min-Max) dissolved and total nutrients and chlorophyll-a measured over the period

April 1984 to April 1985 from inner Pelorus Sound sites (Mills Bay/Schnapper Point) to

outer sites (Richmond Bay), data from Gibbs et al. (1992)19, and unpublished datasets.

Units are in mg/m3. Sound Station NO3-N NH4-N Urea DRP DIN

Queen

Charlotte Mills Bay

13.1

(0.5-39)

19.5

(0.3-59.3)

52.0

(3-102)

8.4

(3-15.7)

32.6

(3.8-83)

Schnapper

Point

25.6

(0.5-71)

17.6

(0.5-88)

50.4

(12-93)

8.8

(2-17.0)

43.2

(6 – 103)

Four Fathom

Bay

32.1

(3.4-78)

14.1

(0.3-85)

48.8

(2-105)

7.9

(2-20.1)

46.2

(3.9-132)

Crail Bay

18.5

(1.1-109)

15

(0.3-63)

52.4

(9-94)

8

(3-30.8)

33.5

(3.7-126)

Hallam Cove

23.6

(2.9-85)

12.3

(0.3-62.1)

48.3

(3-79)

8.3

(2-25.2)

35.9

(4.1-103)

Richmond Bay

30.8

(3.3-77)

11.9

(0.3-44.1)

51.8

(3-94)

8.3

(2-17.0)

42.7

(3.9-89)

Pelorus Tory Channel2

73

(37-111)

10

(3-26)

13

(4-17)

84

(40-128)

Wedge Point1

22.3

(0-79)

36.6

(3.6-36.5)

15.5

(6.6-24.7)

40.0

(<1 -150)

Station DON DOP TP TN Chl-a

Queen

Charlotte Mills Bay

52.3

(3-141)

4.2

(0.5-14.5)

19.0

(5.9-41.7)

167.4

(118-238)

1.97

(0.6-3.9)

Schnapper

Point

34.1

(3-221)

3.6

(0.5-15.0)

16.6

(4.7-29.1)

156

(87-227)

1.64

(0.4-6.0)

Four Fathom

Bay

39.3

(3-170)

3.7

(0.5-13.5)

16.6

(4.3-44.1)

159.3

(109-302)

1.47

(0.16-4.4)

Crail Bay

37.5

(4-187)

3.6

(0.5-13.6)

14.3

(4.9-39.9)

146.9

(96-264)

1.3

(0.48-2.9)

Hallam Cove

27.7

(4-113)

3.2

(0.5-12.5)

14.4

(4.7-36.4)

138.5

(94-248)

1.57

(0.43-4.7)

Richmond Bay

25.8

(2-72)

3.3

(0.5-8.2)

13.7

(7.1-26.6)

136.4

(90-197)

1.05

(0.13-2.8)

Pelorus Tory Channel2

21.1

(13-39)

174.9

(136-227)

1.44

(0.14-4.26)

Wedge Point2

22.4

(10-43)

155

(84-248)

1.95

(0.8 – 5.7) 1.Cawthron nutrient data at inner QC Sound (Wedge Point) for the years 1997 to 1999. 2. Chl-a concentrations are unpublished mean annual, depth-averaged data collected by NIWA for the period 2003-

2005; NO3-N, NH4-N, DRP, DIN, TP and TN concentrations are estimated from unpublished data provided by Marlborough District Council collected over the period 20/10/2011 to 17/1/2012 (see Figures 3 and 4 below).

19 Gibbs MM, Pickmere SE, Woods PH, Payne GW, James MR, Hickman RW, Illingworth J 1992. Nutrient and chlorophyll a variability at six stations associated with mussel farming in Pelorus Sound, 1984–85. New Zealand Journal of Marine and Freshwater Research 26 (2): 197-211.

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Figure 2. Sites of recently collected unpublished data provided by the Marlborough District Council

(MDC) for Queen Charlotte Sound.

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0

2

4

6

8

10

DIN (m

mol m‐3)

QCS‐1

Surface

Deep

0

2

4

6

8

10

DIN (mmol m

‐3)

QCS‐2

Surface

Deep

0

2

4

6

8

10

DIN (m

mol m

‐3)

QCS‐3

Surface

Deep

0

2

4

6

8

10

DIN (m

mol m‐3)

QCS‐4

Surface

Deep

0

2

4

6

8

10

DIN (m

mol m

‐3)

QCS‐5

Surface

Deep

Figure 3. Time series of recently collected data for Queen Charlotte Sound for sites QCS 1 to 5

shown in Figure 3 above. With the exception of Tory Channel (QCS-3) all sites show

evidence of nitrogen limitation in the surface waters over the summer months.

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Figure 4. Two hydrodynamic model grids for the Pelorus and Queen Charlotte Sound regions

showing horizontal area of each element of the model expressed as log10(m2).

Figure 5. Depths used in both the Pelorus and Queen Charlotte hydrodynamic models. Note that

the scale has been truncated to 100 m to show detail within the inner sound regions,

areas shown as dark red in the map may be greater than 100 m.

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Table 8. Yearly existing and total (existing + proposed) salmon farming nitrogen inputs for Port

Gore, Pelorus Sound and Queen Charlotte (QC) Sound. Nutrient loading rates are

expressed as a percentage of a critical nutrient loading rate (CNLR) of 6 mg N/m3/day.

Status Location

Euphotic

Volume

(106 m3)

Salmon

TN1

(Tonne/yr)

Salmon

DIN2

(Tonne/yr)

Net

‘natural’

N3

Total N4

(Tonne/yr)

NLR

(mg N/m3/day)

% of

CNLR

Existing

Pelorus

Sound 5462 504 410.4 4049 4553 2.28 38%

QC

Sound 4864 812 661.2 1271 2083 1.17 20%

Proposed

Pelorus

Sound 672 547.2

QC

Sound 420 342

Port

Gore 168 136.8

Total

Pelorus

Sound 5462 1176 957.6 4049 5225 2.62 44%

QC

Sound 4864 1232 1003.2 1271 2503 1.41 23%

Port

Gore 772 168 136.8 0 136 0.48 8%

1. Total N calculated at rate of 56 kg N/tonne feed (Table 5). 2. DIN calculated at a rate of 45.6 kg DIN/tonne feed (Table 5). 3. ‘Natural’ inputs is the net TN inputs from riverine and ocean sources less any denitrification or aquaculture

removals Pelorus Sound inputs estimated using the mean net tidal input estimate of DIN ocean inputs (see following Figure 9 and Appendix 1 of Water Column Assessment report). Queen Charlotte Sound nitrogen balance set at zero, assuming net oceanic and other inputs approximately match denitrification and aquaculture removal rates.

4. Total N is the sum of salmon and net ‘natural’ inputs.

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0.00

0.20

0.40

0.60

0.80

1.00

1.20

1.40

1.60

De

c-1

0

Jan

-11

Fe

b-1

1

Ma

r-1

1

Ap

r-1

1

Ma

y-1

1

Jun

-11

Jul-

11

Au

g-1

1

Se

p-1

1

Oct

-11

No

v-1

1

Date (mmm-yy)

Fra

ctio

n o

f Me

an

A

nn

ual

Fe

edin

g R

ate

Figure 6. Mean feed loading variation by month for the 2010/2011 year at the Te Pangu and Clay

Point farms expressed as a fraction of their combined mean annual feeding rates.

-80 -60 -40 -20 0 20 40 60 80

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Concentration Difference (Outer - Inner, mgDIN/m3)

Mon

th

Figure 7. Distribution of weekly DIN concentration differences between Outer (i.e. Cook Strait

water) and Inner Pelorus Sound sorted by month for the period February 2007 to July

2010 (data provided by M. Gibbs, NIWA; n = 146). Positive concentrations indicate

coastal water is generally adding DIN into the Sound, but during winter (May to August) it

appears DIN is sometimes lost from the Sound. Blue boxes shown in this figure mark the

interquartile range, with the red vertical lines representing the medians of the data, blue

lines extend out to mark the shorter of 1.5 times the interquartile range or

minima/maxima.

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Table 9. Original mean annual and updated “worst season” estimates for CNLR comparison of

both sounds. Note that seasonal estimates are presented as ‘per year’ equivalents to aid

comparison, although they will only apply to a three month period.

Scenario

Euphotic

volume

(106 m3)

Salmon TN

(Tonne/yr)

Ocean

inputs

only

+ River -

mussels -

denitrification

Net

‘natural’

N

NL

R

% of

CNLR

Worst Seasonal

Factor Increase 1.5 1.3

Original Pelorus

Annual Mean 5462 1176 4200 -151 4049 2.62 44%

Pelorus Worst

Season

(Nov-Jan)

5462 1764 5460 -151 5309 3.55 59%

Original QC

Annual Mean 4864 1148 1650 -379 1271 1.36 23%

QC Worst

Season

(Nov-Jan)

4864 1722 2145 -379 1766 1.96 33%

Original Port

Gore Annual

Mean

772 168 0 0 0 0.48 8%

Port Gore Worst

Season

(Nov-Jan)

772 252 0 0 0 0.72 12%

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Table 10. Change in estimated increase in long-term steady-state nitrogen and chl-a concentrations

from existing background conditions within Pelorus, Queen Charlotte Sounds and Port

Gore under proposed initial feeding scenarios using a simple flushed aspatial model.

Note that more complex spatially explicit modelling suggests these results are

underestimated by between 50% to 90% of estimated long-term spatially explicit model

results, which suggests these results have limited use in the assessment.

Description Pelorus Queen

Charlotte

Port

Gore

Proposed feeding load increase (tonne/year) 12000 7500 3000

TN load per tonne of feed (kg/tonne feed) 56 56 56

Proposed N Load (tonne/yr) 672 420 168

Proposed N load (tonne/tide) 0.954 0.596 0.238

Mean tidal volume (106 m3) 737 289.5 290.5

TN conc. change (mg TN/m3) 1.294 2.059 0.821

Background TN concentration (mg N /m3) 150 160 150

Percent increase from background TN1 0.86% 1.29% 0.55%

N to chl-a ratio 0.114 0.114 0.114

Potential chl-a conc. increase (mg/m3)2 0.147 0.234 0.093

1. Assuming a mean annual sound-wide TN concentration before salmon farming from Pelorus Sound of 150 mg/m3

(Gibbs et al., 199220) and a mean of 160 mg TN/m3 for QC Sound based on unpublished DIN concentrations from Wedge Point and assuming a 4:1 TN:DIN ratio as observed in Pelorus Sound.

2 Realised changes in chl-a will only occur when phytoplankton biomass can become high naturally (e.g. autumn and spring bloom periods) so in order to put the results into context they should be compared to maximum observed chl-a concentrations in the regions (i.e. 6.0 mg chl-a/m3 Pelorus and 5.7 mg chl-a/m3 in Queen Charlotte Sound; Table 5)

20 Gibbs MM, Pickmere SE, Woods PH, Payne GW, James MR, Hickman RW, Illingworth J 1992. Nutrient and chlorophyll a variability at six stations associated with mussel farming in Pelorus Sound, 1984–85. New Zealand Journal of Marine and Freshwater Research 26 (2): 197-211.

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Figure 8. Mean potential TN and chl-a concentrations from the proposed salmon farms under

recommended initial feeding limits (n=1424) for the surface (upper) and bottom (lower)

model layers in Pelorus Sound during the 30-day period 24 July to 23 August 2008

(model days 60 to 90). Note the largest value on the scale represents about 10% of the

mean annual TN concentration which will be composed of varying ratios of particulate

and dissolved forms of nitrogen.

of 27



recommended initial feeding limits (n=1424) for the surface (upper) and bottom (lower)

model layers in Queen Charlotte Sound during the 30-day period 24 July to 23 August

2008 (model days 60 to 90). Note the largest value on the scale represents about 10% of

the mean annual TN concentration which will be composed of varying ratios of particulate

and dissolved forms of nitrogen.

of 27



recommended initial feeding limits (n=1424) for the surface model layer in Port Gore

during the 30-day period 24 July to 23 August 2008 (model days 60 to 90). Note the

largest value on the scale represents about 20% of an estimated mean annual TN

concentration for the region which will be composed of varying ratios of particulate and

dissolved forms of nitrogen.

of 27


Figure 11. Minimum (5th percentile, upper) and maximum (95th percentile, lower) potential TN and

chl-a concentration increases from the proposed salmon farms under recommended

initial feeding limits (n=1424) for the surface model layers in Pelorus Sound during the 30-

day period 24 July to 23 August 2008 (model days 60 to 90). Note the largest value on

the scale represents about 10% of the mean annual TN concentration which will be

composed of varying ratios of particulate and dissolved forms of nitrogen.

of 27




initial feeding limits (n=1424) for the surface model layers in Queen Charlotte Sound

during the 30-day period, 24 July to 23 August 2008 (model days 60 to 90). Note the

largest value on the scale represents about 10% of the mean annual TN concentration

which will be composed of varying ratios of particulate and dissolved forms of nitrogen.

of 27




initial feeding limits (n=1424) for the surface model layers in Port Gore during the 30-day

period, 24 July to 23 August 2008 (model days 60 to 90). Note the largest value on the

scale represents about 35% of the mean annual TN concentration which will be

composed of varying ratios of particulate and dissolved forms of nitrogen. White regions

shown in the upper figure indicate model cells that were dry for a period of time during the

model run.

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Figure 14. Mean potential TN and chl-a concentration increases from the proposed salmon farms

under a 50% elevated seasonal feeding scenario (n=1424) for the surface model layer in

Pelorus Sound during the 30-day period 24 July to 23 August 2008 (model days 60 to

90). Note the largest value on the scale represents about 10% of the mean annual TN

concentration and has been retained for comparative purposes, but may not show the

maximum concentrations close (<1 km) to the proposed sites.

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Figure 15. Mean potential TN and chl-a concentrations from the proposed salmon farms under a

50% elevated seasonal feeding scenario (n=1424) for the surface model layer in Queen

Charlotte Sound during the 30-day period 24 July to 23 August 2008 (model days 60 to

90). Note the largest value on the scale represents about 10% of the mean annual TN

concentration which will be composed of varying ratios of particulate and dissolved forms

of nitrogen.

of 27


Figure 16. Mean potential TN and chl-a concentrations from the proposed salmon farms under a

50% elevated seasonal feeding scenario (n=1424) for the surface model layer in Port

Gore during the 30-day period 24 July to 23 August 2008 (model days 60 to 90). Note

the largest value on the scale represents about 33% of the mean annual TN

concentration which will be composed of varying ratios of particulate and dissolved forms

of nitrogen.

of 27


Figure 17. Flux and fate of feed nitrogen from the proposed salmon farms.

Table 11. Comparison of long-term retained load estimates from the flushed aspatial and spatial

model estimates, showing the aspatial model estimates were much (53% to 89%) lower

than spatial model estimates.

Region

Volume

of region

(106 m3)

Estimated flushed

aspatial

concentration

increase (mg TN/m3)

Aspatial

retained

load

(tonne TN)

Spatial

retained

load

(tonne TN)

% Difference

(1-Aspatial/Spatial)*100

Pelorus Sound 9200 1.294 11.90 89 87%

Queen Charlotte

Sound 9100 2.06 18.75 40 53%

Port Gore 961 0.821 0.79 7 89%

IN THE MATTER of the Resource Management Act 1991 · deployments of Acoustic Doppler Current...

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