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Blue Ling - Other areas of Northeast Atlantic, 2008
Marine Resource  Fact Sheet
ICES Advice 2009
Blue Ling - Other areas of Northeast Atlantic, 2008
Fact Sheet Citation  
Blue ling in Subdivisions I, II, IIIa, Iva, VIII, IX and XII
Owned byInternational Council for the Exploration of the Sea (ICES) – More
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Species:
FAO Names: en - Blue ling, fr - Lingue bleue, es - Maruca azul, ru - Мольва голубая (=биркеланга)
Geographic extent of Blue Ling - Other areas of Northeast Atlantic
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Sub-Regional
 
 
Habitat and Biology
Depth zone: Slope (200 m - 1000 m).   Vertical distribution: Demersal/Benthic.  

Water Area Overview
Spatial Scale: Sub-Regional

Geo References
Resource Structure
Considered a single stock: Yes
Assessment
 
Assessment Model
Methodology

Scientific basis

Very few fisheries data are available for blue ling in these areas. The advice is based solely on trends in landings.

Uncertainties in assessment and forecast

Landings reported from Subareas VIII and IX as blue ling (Molva dypterygia) are considered to consist mainly of a related species Molva macropthalma.

Comparison with previous assessment and advice

There has been no change in the perception of blue ling in these areas.
Overall Assessment Results


Table 9.4.11.3.1. Blue ling (Molva dypterygia). Working Group estimates of landings (tonnes). Blue ling: Subarea I.
Year Iceland Norway Germany Total
1988        
1989        
1990        
1991        
1992        
1993        
1994   3   3
1995   5   5
1996       0
1997   1   1
1998   1   1
1999       0
2000   1   1
2000   3   3
2001   1   1
2002   1   1
2003       0
2004   1   1
2005   1   1
2006       0
2007*       0
*Preliminary.


Table 9.4.11.3.1. Cont’d. Blue ling: Divisions IIa and b.
Year Faroes France Germany Greenland Norway E & W Scotland Sweden Russia Total
1988 77 37 5   3416 2       3537
1989 126 42 5   1883 2       2058
1990 228 48 4   1128 4       1412
1991 47 23 1   1408         1479
1992 28 19   3 987 2       1039
1993   12 2 3 1003         1020
1994   9 2   399 9       419
1995 0 12 2 2 342 1       359
1996 0 8 1   254 2 2     267
1997 0 10 1   280         291
1998 0 3     272   3     278
1999 0 1 1   287   2     291
2000   2 4   240 1 2     249
2001 8 7     190 1 2     208
2002 1 1     129 1 17     149
2003 30       115   1 1   147
2004 28 1     144       1 174
2005 47 3     144 1     2 197
2006 49 4     149         202
2007* 102 3     154   4     263
*Preliminary.


Table 9.4.11.3.1. Cont’d. Blue ling: Subarea III.
Year Denmark Norway Sweden Total
1988 10 11 1 22
1989 7 15 1 23
1990 8 12 1 21
1991 9 9 3 21
1992 29 8 1 38
1993 16 6 1 23
1994 14 4   18
1995 16 4   20
1996 9 3   12
1997 14 5 2 21
1998 4 2   6
1999 5 1   6
2000 13 1   14
2001 20 4   24
2002 8 1   9
2003 18 1   19
2004 18 1   19
2005 48 1   49
2006 42     42
2007*       0


Table 9.4.11.3.1. Cont’d. Blue ling: Division IVa.
Year Denmark Faroes France (IV) Germany Norway E & W Scotland Ireland Total
1988 1 13 223 6 116 2 2   363
1989 1   244 4 196 12   457
1990     321 8 162 4   495
1991 1 31 369 7 178 2 32   620
1992 1   236 9 263 8 36   553
1993 2 101 76 2 186 1 44   412
1994     144 3 241 14 19   421
1995   2 73   201 8 193   477
1996   0 52 4 67 4 52   179
1997   0 36   61 0 172   269
1998   1 31   55 2 191   280
1999 2   21   94 25 120 2 264
2000 2   15 1 53 10 46 2 129
2001 7   9   75 7 145 9 252
2002 6   11   58 4 292 5 376
2003 8   8   49 2 25   92
2004 7   17   45   14   83
2005 6   7   51   2   66
2006 6   6   82       94
2007* 5   2   55       62


Table 9.4.11.3.1. Cont’d. Blue ling: Subarea XII.
Year Faroes France Germany Spain E & W Scotland Norway Iceland Poland Lithuania Russia Total
1988   263                   263
1989   70                   70
1990   5                   5
1991   1147                   1147
1992   971                   971
1993 654 2591 90                 3335
1994 382 345 25                 752
1995 514 47     12             573
1996 445 60   264   19           788
1997 1 1   411 4             417
1998 36 26   375 1             438
1999 156 17   943 8 43   186       1353
2000 89 23   406 18 23 21 14       594
2001 6 26   415 32 91 103 2       675
2002 19     1234 8   9         1270
2003   7   971   2 40   12 37   1069
2004   27   610             7 644
2005   10   636           8   654
2006   61                 4 65
2007* 1                     1


9.4.11.3.1. Cont’d. Blue ling: Total landings by Subarea/Division (landings from Areas VIII, IX, and X given in previous reports are now considered to represent Molva macropthalma).
Year I II III IV XII Total
1988   3537 22 363 263 4185
1989   2058 23 459 70 2610
1990   1412 21 501 5 1939
1991   1479 21 627 1147 3274
1992   1039 38 554 971 2602
1993   1020 23 415 3335 4793
1994 3 419 18 424 752 1616
1995 5 359 20 483 573 1440
1996 0 267 12 190 788 1257
1997 1 291 21 270 417 1000
1998 1 278 6 286 438 1009
1999 0 291 6 265 1353 1915
2000 1 249 14 130 594 988
2001 3 208 24 252 675 1162
2002 1 149 9 377 1270 1806
2003 1 147 19 101 1069 1337
2004 0 174 19 83 644 920
2005 1 171 49 70 0 291
2006 0 202 42 94 65 403
2007* 0 263 0 62 1 326
*Preliminary.


Figure 9.4.11.3.1. Blue ling (Molva dypterygia). Working Group estimates of landings (tonnes).


Scientific Advice

Single-stock exploitation boundaries

There should be no directed fisheries for blue ling and management measures should be implemented to minimize the bycatch of this species in mixed fisheries. Blue ling is susceptible to sequential depletion of spawning aggregations and closed areas to protect spawning aggregations should therefore be maintained and expanded where appropriate.
Management
 
Management Advice

Management considerations

Blue ling has been an important bycatch in the trawl fisheries for mixed deep-water species on Hatton Bank (Subarea XII).
Biological State and Trend
Exploitation rate: Undefined
Abundance level: Undefined

Trends in landings suggest serious depletion, at least in Subareas IIa and IIb (Figure 9.4.11.3.1).
Source of information
 
ICES.2009.Report of the ICES Advisory Committee, 2009. ICES Advice, 2009.
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