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Ling - Iceland Grounds
Marine Resource  Fact Sheet
ICES Advice 2009
Ling - Iceland Grounds
Fact Sheet Citation  
Ling in Division Va (Iceland)
Owned byInternational Council for the Exploration of the Sea (ICES) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
FAO Names: en - Ling, fr - Lingue franche, es - Maruca, ru - Мольва обыкновенная
Geographic extent of Ling - Iceland Grounds
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Sub-Regional
Reference year: 2008
 
 
Biological State and Trend
State & Trend Descriptors
PartnerFIRMS
Exploitation rateUndefinedUncertain/Not assessed
Abundance levelUndefinedUncertain/Not assessed

A survey biomass index shows increasing abundance since 2000 (Figure 9.4.10.2.1). The levels are currently at a similar high level as in the start of the series. There are indications that fishing mortality may have declined in recent years (Figure 9.4.10.2.2).
Habitat and Biology
Depth zone: Slope (200 m - 1000 m).   Vertical distribution: Demersal/Benthic.  

Geographical Distribution
Jurisdictional distribution: National

Water Area Overview
Spatial Scale: Sub-Regional

Geo References
Resource Structure
Considered a single stock: Yes
Exploitation
 

Factors affecting the fisheries and the stock

The fishery is limited by a specific TAC for ling. Bycatches of ling in the cod fishery only occur in some areas.
Assessment
 
Assessment Model
Methodology

Scientific basis

The assessment is based on the Icelandic March groundfish survey. The trends are confirmed by the October survey (Figure 9.4.10.2.1). The surveys also provide an indication of mortality (Figure 9.4.10.2.2).

Comparison with previous assessment and advice

The perception of the stock has changed since the last advice, from being stable at a very low level to being increasing. This change is due to increases detected in the biomass index. The advice in 2006 was to maintain catches at the 2001–2004 level. This year the advice is to constrain catches to 7500 t (average 2006–2007).
Overall Assessment Results


Table 9.4.10.2.1. Ling. Landings in ICES Division Va since 1950. Source: STATLANT database, except bold values which are WG best estimates.
Year Belgium Faeroe Is. France Germany Iceland Norway UK (E,W,NI) UK (Sco) Total
1950         3551       10497
1951         3278       10929
1952         4420       11454
1953         3325       11470
1954         3442       13095
1955         3972       11693
1956         3823       11525
1957         3591       9687
1958         4195       11663
1959         2681       8700
1960         6774       13770
1961         6032       10066
1962         7073       12117
1963         5607       10492
1964         4976       10374
1965         4811       10658
1966         4559       10032
1967         7531       13152
1968         8697       14526
1969         8677       14138
1970         8345       14362
1971         8867       15391
1972         6085       10177
1973 1080 984 0 586 3564 418 819 10 7461
1974 681 890 0 486 3868 318 511 21 6775
1975 736 732 23 375 3748 522 541 21 6698
1976 431 498 0 404 4538 502 259 9 6641
1977 442 613 0 254 3433 506 0 0 5248
1978 541 534 0 0 3439 484 0 0 4998
1979 508 536 0 0 3759 399 0 0 5202
1980 445 607 0 0 3149 423 0 0 4624
1981 196 489 0 0 3348 415 0 0 4448
1982 116 524 0 0 3733 612 0 0 4985
1983 128 644 0 0 4256 115 0 0 5143
1984 103 450 0 0 3304 21 0 0 3878
1985 59 384 0 0 2980 17 0 0 3440
1986 88 556 0 0 2948 4 0 0 3596
1987 157 657 0 0 4154 6 0 0 4974
1988 134 619 0 0 5083 10 0 0 5846
1989 95 614 0 0 4833 5 0 0 5547
1990 42 399 0 0 5115 0 0 0 5556
1991 69 530 0 0 5182 0 0 0 5781
1992 34 526 0 0 4546 0 0 0 5106
1993 20 501 0 0 4319 0 0 0 4840
1994 3 548 0 0 4053 0 0 0 4604
1995 0 463 0 0 3729 0 0 0 4192
1996 0 358 0 0 3670 20 12 0 4060
1997 0 299 0 0 3626 0 0 0 3925
1998 0 699 0 0 3603 0 0 0 4302
1999 0 500 0 0 3973 120 4 1 4598
2000 0 452 0 0 3221 67 3 0 3743
2001 0 362 0 2 2863 116 1 0 3344
2002 0 1629 0 0 2830 45 0 0 4504
2003 0 565 0 2 3584 108 2 1 4262
2004 0 739 0 1 3718 139 0 0 4597
2005 0 682 0 1 4307 180 0 19 5189
2006 0 960 0 1 6287 158 0 0 7406
20071) 0 849 0 0 6600 185 0 0 7634


Figure 9.4.10.2.1. Ling. Indices from the groundfish survey in March 1985–2008. a) Abundance of fish less than 40 cm, b) Biomass of fish 40 cm and larger. The shaded area shows 1 standard error of the estimate.


Figure 9.4.10.2.3. Ling. Landings in ICES Division Va. Source: STATLANT database and partly WG estimates (see Table 9.4.10.2.1).

Reference Point
 

In common with other deep-water stocks, Ulim has previously been proposed at 0.2* virgin biomass and Upa at 0.5* virgin biomass (ICES, 1998). In the absence of abundance indices that correspond to the start of the fishery, the reference points cannot be calculated.
Scientific Advice

Single-stock exploitation boundaries

Surveys indicate that the overall biomass is increasing. Landings have also increased. ICES recommends constraining catches to 7500 t (recent average 2006–2007) and to collect information that can be used to evaluate a long-term sustainable level of exploitation.


Figure 9.4.10.2.2. Ling. Estimates of trends in relative fishing mortality (Yield/Survey biomass).


Management
 
Management Advice

Management considerations

Ling is a bycatch in the Icelandic longline and trawl fisheries, which is mainly directed at cod.
Source of information
 
ICES.2009.Report of the ICES Advisory Committee, 2009. ICES Advice, 2009.
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