Information

Authorisation of marine fish farms in Scottish waters: locational guidelines

Category 1, 2 and 3 areas designated on the basis of Marine Scotland Science (MSS) predictive models to estimate environmental sensitivity of sea lochs.

This document is part of a collection


The following tables and maps describe the Category 1, 2 and 3 areas for the Scottish Government Locational Guidelines, designated on the basis of MSS predictive modelling to estimate nutrient enhancement and benthic impact in sea lochs or similar water bodies supporting aquaculture. For a detailed explanation of how these categorisations were derived, refer to the Scottish Fisheries Research Report ‘Scottish Government Locational Guidelines for fish farming: Predicted levels of nutrient enhancement and benthic impact’. Predictive models were used to assign each sea loch an index of ‘nutrient enhancement’ and ‘benthic impact’.

The sum of these indices was used for the categorisation of areas as indicated below.

Combined 'nutrient enhancement' and 'benthic impact' indices

Category

7 – 10 1
5 – 6 2
0 – 4 3

These tables and maps were last updated in March 2022. The next update will be in June 2022. Maps are available on the Marine Scotland website.

Please note that the Sealoch parameters used in the MSS Locational Guidelines predictive models for the calculation of the sea loch categories can now be found at the end of this document.

Category 1 areas

For 'Maximum biomass (tonnes)', biomasss is as consented by SEPA at time of modelling, taking into consideration grouped and rotational sites.

For 'Total biomass (tonnes)', biomass is as consented by SEPA at the time of modelling on a site-by site-basis.

 

Loch

Maximum biomass (tonnes)

Total biomass (tonnes)

‘Nutrient enhancement’ index

‘Benthic impact’ index

‘Combined’ index

1 Loch Airdbhair (inc Loch na Droigniche) 375 375 3 4 7
2 Calbha Bay 1080 1080 4 3 7
3 Loch Meanervagh 433 433 4 4 8
4 Northra Voe 500 500 4 3 7
5 Sandsound Voe 5136 5136 4 3 7
6 Loch Sheilavaig 1211 2111 4 4 8
7 Stromness Voe 1650 1650 4 3 7
8 Vala Sound 3595 3595 4 3 7
9 Vidlin Voe 2846 2846 4 3 7
10 Weisdale Voe 3952 3952 4 3 7

Category 2 areas

For 'Maximum biomass (tonnes)', biomasss is as consented by SEPA at time of modelling, taking into consideration grouped and rotational sites.

For 'Total biomass (tonnes)', biomass is as consented by SEPA at the time of modelling on a site-by site-basis.

 

Loch

Maximum biomass (tonnes)

Total biomass (tonnes)

‘Nutrient enhancement’ index

‘Benthic impact’ index

‘Combined’ index

1 A’Choire 1400 1400 3 3 6
2 Loch Ainort 1800 1800 2 3 5
3 Aith Voe 3484 3484 3 2 5
4 Loch A’Laip 750 750 3 3 6
5 Badcall Bay 1007 1607 3 3 6
6 Baltasound 2185 2185 3 2 5
7 Basta Voe 4461 4461 3 3 6
8 Loch Boisdale 4071 4071 3 3 6
9 Brindister Voe / Vementry Sound 2166 2166 3 2 5
10 Busta Voe 1050 1050 3 2 5
11 Loch Carnan 410 410 3 3 3
12 Cat Firth 1343 1343 3 2 5
13 Loch Clash 540 540 2 3 5
14 Clift Sound 4982 4982 3 3 6
15 Dales Voe North 850 850 3 2 5
16 Dury Voe 5460 5460 3 2 5
17 East Loch Tarbert 13212 13212 2 3 5
18 Loch Eport 1589 1589 2 3 5
19 Loch Erisort / Leurbost 8777 8777 2 3 5
20 Loch Greshornish 2195 2195 2 3 5
21 Loch Grimshader 622 622 3 3 6
22 Loch Grosebay 2001 2001 3 3 6
23 Gruting Voe 4395 4395 4 2 6
24 Loch Harport 2000 2000 2 3 5
25 Loch Kishorn 3500 4799 2 3 5
26 Loch Laxfirth 942 942 3 2 5
27 Mid Yell Voe 1210 1210 3 3 6
28 Loch Nedd 250 250 2 3 5
29 Loch Odhairn 2801 2801 3 3 6
30 Olna Voe 2500 2500 3 3 6
31 Loch Pooltiel 2700 2700 3 2 5
32 Loch Portree 4214 4214 2 3 5
33 Ronas Voe 2350 2350 3 2 5
34 Loch Seaforth 7380 7380 2 3 5
35 Loch Shell 6453 6453 2 3 5
36 Loch Skiport 2460 2460 3 3 6
37 Swarbacks Minn 19842 20342 3 3 6
38 Swining Voe 1920 1920 3 2 5
39 Swinister Voe 13227 13227 3 3 6
40 Uig Bay 1625 1625 3 3 6
41 Loch Uiskevagh 1104 1104 3 3 6
42 Wadbister Voe 800 800 3 2 5

Category 3 areas

For 'Maximum biomass (tonnes)', biomasss is as consented by SEPA at time of modelling, taking into consideration grouped and rotational sites.

For 'Total biomass (tonnes)', biomass is as consented by SEPA at the time of modelling on a site-by site-basis.

 

Loch

Maximum biomass (tonnes)

Total biomass (tonnes)

‘Nutrient enhancement’ index

‘Benthic impact’ index

‘Combined’ index

1 Loch Ailort 300 300 1 1 2
2 Loch Aline 0 0 0 0 0
3 Loch Alsh (inc Loch Long) 5600 5600 2 2 4
4 Loch Arnish 0 0 0 0 0
5 Loch Bay 500 500 1 1 2
6 Loch Bracadale 2075 2075 1 1 2
7 Broad Bay 2240 2240 1 1 2
8 Loch Broom 1050 1050 1 1 2
9 Burwick Bay 0 0 0 0 0
10 Loch Cairnbhain (inc. Loch Glendhu and Loch Glencoul) 3250 3250 2 2 4
11 Loch Caolisport 192 192 1 1 2
12 Loch Carron 2687 2687 1 2 3
13 Loch Claidh 0 0 0 0 0
14 Collafirth Voe 0 0 0 0 0
15 Loch Craignish 3183 3183 2 2 2
16 Loch Creran 3000 3000 2 2 4
17 Dales Voe 0 0 0 0 0
18 Loch Duich 2500 2500 2 2 4
19 Loch Dunvegan 5945 5945 2 2 4
20 Loch Eishort 1200 1200 2 2 4
21 Loch Eriboll 1395 1395 1 1 2
22 Loch Etive 4004 4004 2 2 4
23 Loch Ewe 1 1 1 0 1
24 Loch Eynort 20 20 1 1 2
25 Loch Feochan 0 0 0 0 0
26 Loch Fyne 13557 13557 1 1 2
27 Loch Geocrab 200 200 2 2 4
28 Loch Hourn 3375 3375 1 2 3
29 Loch Inchard 0 0 0 0 0
30 Loch Kilerivagh 0 0 0 0 0
31 Kirk Hope 0 0 0 0 0
32 Loch Laxford 1390 2026 2 2 4
33 Loch Leven 1607 1607 2 2 4
34 Loch Linnhe (inc.Loch Eil) 5000 5000 1 2 3
35 Little Loch Broom 1997 1997 1 2 3
36 Loch Long (inc. Loch Goil) 4522 4522 1 1 2
37 Loch Melfort 615 615 1 1 2
38 Loch Mharabhig 0 0 0 0 0
39 Loch Moidart 0 0 0 0 0
40 Loch na Keal 2770 2770 1 2 3
41 Loch Nevis 4480 4480 1 2 3
42 Pierowall Bay 165 165 2 2 4
43 Loch Riddon 0 0 0 0 0
44 Loch Roag 15739 15739 2 2 4
45 Loch Ryan 0 0 0 0 0
46 Loch Scridain 1900 1900 1 1 2
47 Selivoe 963 963 3 1 4
48 Loch Slapin 350 350 1 2 3
49 Loch Sligachan 0 0 0 0 0
50 Loch Snizort Beag 500 500 1 2 3
51 Loch Spelve 1578 1578 2 1 3
52 Loch Stockinish 0 0 0 0 0
53 Loch Striven 4673 4673 2 2 4
54 Loch Sunart 5680 5680 1 2 3
55 Loch Sween 0 0 0 0 0
56 Tobermory Bay 0 0 0 0 0
57 Loch Torridon 7685 7685 1 2 3
58 Loch Tuath 2350 2350 1 2 2
59 West Burra Firth 0 0 0 0 0
60 West Loch Tarbert 4371 4371 2 2 4
61 Whalefirth Voe 813 813 2 2 4
62 Whiteness Voe 500 500 3 1 4

Prevous reports are in our website archive.

Sealoch parameters* used in the MSS Locational Guidelines predictive models

* The majority of these parameters have been taken from Edwards and Sharples (1986), however the volumes and areas were re-calculated in 2006 by digitising the depth contours on Admiralty charts.

Loch name

Length (km)

Area (km squared) Volume (mm cubed)) Tidal range (m) Tf (days)

(Mm cubed 3 year-1)

A’Choire

2.3

1.3

17.1

3.4

3.0

2077

Ailort

8.1

8.7

91.3

4.3

1.9

17542

Ainort

3.9

3.5

52.5

4.6

2.5

7665

Airdbhair

2.2

0.4

2.1

4.2

0.9

839

Aith Hope

1.8

0.6

3.0

2.3

1.7

644

AIith Voe

4.0

4.8

117.7

1.7

10.7

4015

A’Laip

2.5

1.1

5.7

3.9

1.0

2072

Aline

3.5

1.8

17.5

3.4

2.2

2903

Alsh

13.1

27.2

933.9

4.6

5.6

60873

Arnish

2.0

2.0

61.1

3.2

7.2

3097

Badcall Bay

1.9

1.3

13.9

3.6

2.3

2208

Baltasound

2.9

3.7

30.5

1.9

3.3

3375

Basta Voe

5.2

5.7

75.5

1.9

5.2

5298

Bay

6.9

15.4

343.0

4.5

3.7

33837

Boisdale

5.7

4.7

55.1

3.8

2.3

8749

Bracadale

10.5

45.8

1053.9

3.1

5.6

68693

Brindister

5.5

5.0

46.2

1.7

4.1

4112

Broad Bay

14.0

82.5

1357.7

4.1

3.0

165188

Broom

14.7

16.0

391.6

4.5

4.1

34864

Burswick

0.9

0.4

4.4

0.9

8.5

189

BUSTA

3.0

3.0

50.7

1.7

7.3

2537

Cairnbhain

14.9

14.0

330.6

4.2

4.2

28727

Calbha Bay

1.4

0.7

8.2

3.6

2.6

1153

Caolisport

8.3

14.9

163.4

0.9

9.1

6552

Carnan

1.8

0.7

2.1

3.9

0.6

1294

Carron

26.7

20.6

602.5

4.7

4.7

46791

Cat Firth

3.0

2.8

26.9

1.8

4.1

2395

Claidh

6.7

4.5

97.6

4.2

3.9

9134

Clash

1.6

1.0

17.2

4.2

3.0

2096

Clift Soundf

10.0

8.5

123.6

1.4

7.8

5782

Collafirth

2.4

0.9

11.5

1.8

5.1

820

Craignish

8.8

14.6

202.0

2.1

5.0

14750

Creran

12.8

12.4

161.1

3.3

3.0

19600

Dales Voe

4.9

3.2

47.3

1.2

9.2

1877

Dales Voe North

5.1

3.1

48.2

1.8

6.4

2751

Duich

8.3

11.2

510.7

4.6

7.4

25191

Dunvegan

10.4

21.7

1255.5

4.5

9.6

47736

Dury Voe

6.5

13.0

308.5

1.4

13.1

8597

East Loch Tarbert

8.5

26.2

518.5

4.2

3.6

52575

Eishort

5.2

2.5

19.4

4.3

1.4

5045

Eport

7.0

3.9

27.4

4.1

1.3

7695

Eriboll

15.5

37.5

954.1

4.3

4.4

79150

Erisort/Leurbost

14.6

15.8

227.0

4.1

2.6

31873

Etive

29.5

28.3

948.7

1.8

13.9

24913

Ewe

11.9

43.0

846.3

4.4

3.4

90853

Eynort

4.3

2.2

17.3

4.1

1.4

4502

Feochan

6.7

2.8

17.9

3.3

1.5

4356

Fyne

60.5

183.3

9440.2

3.1

12.4

277876

Geocrab

2.5

0.6

5.4

4.2

1.6

1227

Greshornish

5.9

4.7

74.1

4.6

2.6

10403

Grimshader

3.5

0.9

8.4

4.1

1.7

1806

Grosebay

2.6

2.9

47.9

4.2

2.9

6025

Gruting

7.6

6.7

95.7

1.1

9.7

3600

Harport

12.5

7.2

108.8

4.3

2.7

14710

Hourn

21.3

34.5

1905.0

4.2

9.8

70953

Inchard

6.6

3.7

77.1

4.2

3.7

7608

Kilerivach

4.2

1.0

2.2

3.9

0.5

1606

Kirk Hope

1.8

0.6

4.4

2.3

2.4

669

Kishorn

4.1

7.8

191.3

4.7

3.9

17901

Laxfirth

3.8

2.3

21.1

1.8

3.9

1977

Laxford

7.0

7.2

107.5

4.2

2.7

14528

Leven

13.4

8.1

149.2

3.7

3.8

14335

Linnhe

29.1

33.7

1303.7

3.7

7.8

61006

Little L Broom

12.7

23.0

914.7

4.5

6.6

50587

Long

26.9

44.0

1758.0

3.1

9.6

66840

Meanervach

1.4

0.2

0.8

3.9

0.9

315

Melfort

6.0

10.2

256.5

2.3

8.2

11418

Mharabhig

1.3

0.5

1.7

4.1

0.7

864

Mid Yell

3.3

1.7

11.7

1.9

2.7

1576

Moidart

2.8

2.9

8.6

4.3

0.6

5232

Na Keal

10.7

32.2

694.7

3.8

4.3

58966

Nedd

2.4

0.5

3.3

4.2

1.1

1110

Nevis

17.2

29.9

1505.0

4.3

8.8

62424

Northra Voe

1.0

0.3

2.2

1.5

4.2

187

Odhairn

3.6

1.8

29.8

4.1

3.1

3511

OlnaVoe

4.6

4.0

79.6

1.7

8.7

3341

Pierowall Harbour

1.6

1.1

3.5

2.3

1.0

1286

Pool Tiel

3.9

3.9

111.4

3.1

7.0

5808

Portree

4.9

4.1

88.3

4.6

3.5

9212

Riddon

5.3

2.8

49.8

2.6

5.1

3561

Roag

14.0

68.3

1135.5

3.6

3.5

118419

Ronas Voe

9.4

9.4

176.0

1.7

8.2

7834

Ryan

13.4

36.6

166.4

2.8

1.3

46720

Sandsound

8.6

6.0

69.7

1.1

7.9

3219

Scridain

12.0

27.0

734.2

3.7

5.5

48721

Seaforth

22.6

24.6

604.1

4.2

4.4

50111

Selivoe

4.0

4.8

88.9

1.1

12.5

2597

Sheilavaig

3.0

0.6

1.5

4.1

0.5

1105

Shell

7.5

15.0

391.5

4.1

4.8

29769

Skiport

4.6

3.0

38.9

4.1

2.4

5919

Slapin

3.4

2.1

11.6

4.3

1.0

4219

Sligachan

4.4

1.7

15.7

4.6

1.5

3809

Snizort Beg

4.7

6.9

101.9

4.6

2.5

14884

Spelve

7.7

8.9

144.9

3.5

3.5

15111

Stockinish

3.5

1.5

17.8

4.2

2.1

3093

Striven

12.9

14.3

546.7

2.6

11.0

18142

StromnessVoe

4.6

2.3

13.6

1.1

4.1

1209

Sunart

30.7

50.6

1754.0

4.0

6.5

98493

Swarbacks Minn

13.0

30.9

995.1

1.7

14.1

25759

Sween

14.8

17.4

216.9

1.6

5.9

13418

Swining Voe

4.0

3.5

63.1

1.8

7.6

3031

Swinster Voe

6.3

14.9

367.5

1.8

4.9

27377

Tobermory Bay

1.6

1.6

36.6

3.7

4.7

2842

Torridon

22.2

68.5

3300.2

4.9

7.4

162779

Tuath

9.5

23.4

412.4

3.5

3.8

39616

Uig Bay

8.8

3.1

64.8

3.1

5.1

4639

Uiskevagh

3.3

1.9

10.0

4.1

1.0

3652

Vaila Sound

3.5

3.6

35.6

1.2

6.1

2128

Vidlin Voe

3.0

2.7

37.3

1.8

5.7

2392

Wadbister Voe

2.1

1.6

18.2

1.8

4.7

1416

Weisdale

6.7

6.0

104.0

1.1

11.7

3244

West Burra Firth

1.6

0.9

10.4

1.3

6.7

567

West Loch Tarbert

6.5

23.2

396.9

3.8

3.4

42614

Whalefirth

6.3

3.1

28.0

1.9

3.6

2839

Whiteness Voe

4.5

3.0

36.0

1.1

8.3

1583

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Published by The Scottish Government, April 2022

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