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Tusk - Iceland and Reykjanes Ridge, 2008
Marine Resource  Fact Sheet
ICES Advice 2009
Tusk - Iceland and Reykjanes Ridge, 2008
Fact Sheet Citation  
Tusk in Division Va and Subarea XIV
Owned byInternational Council for the Exploration of the Sea (ICES) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
FAO Names: en - Tusk(=Cusk), fr - Brosme, es - Brosmio, ar - بروسمة, zh - 单鳍鳕, ru - Менек (=морской налим)
Geographic extent of Tusk - Iceland and Reykjanes Ridge
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
Exploitation
 

Factors affecting the fisheries and the stock

The fisheries have been managed through TACs since 2001. Closed areas off the south and southeastern coast of Iceland have been implemented in 2003 to prevent the fishing on juveniles in Division Va.
Assessment
 
Assessment Model
Methodology

Scientific basis

Total catches are shown in Figure 9.4.12.2.1, cpue trends are shown in Figure 9.4.12.2.2, and fishing mortality signal is shown in Figure 9.4.12.2.3.

The perception of the state of the stock is based on a combination of the Icelandic March and October groundfish surveys. The March survey gives a signal on recruitment. The October survey reflects more the abundance of adult biomass. The trend in recruitment is confirmed by the length distribution of tusk in the catches.

Comparison with previous assessment and advice

There are no changes to the perception of the state of the stock. The current advice is in line with previous advice.
Overall Assessment Results


Table 9.4.12.2.1. Tusk in Division Va. Single-stock exploitation boundaries (advice), management, and catch/landings.
Year

ICES

Advice

Predicted landings

corresp. to (single-stock) exploitation boundaries/advice

Agreed

TAC1

Official landings

ACFM

Landings

1988         6866
1989         7099
1990         7323
1991         8867
1992         8211
1993         6138
1994         5852
1995         6312
1996         6383
1997         5507
1998         5186
1999         7233
2000         6399
2001     4500   4880
2002     3500   5611
2003     3500   5657
2004     3500   4858
2005     3500   5057
2006     5000   6674
2007   4900 5000   7638
2008          
2009 Constrain catch to 5000 t 5000      
2010 Constrain catch to 5000 t 5000      

Weights in tonnes.

1. TACs set by Iceland for the Icelandic fishing fleet only.



Table 9.4.12.2.2. Tusk in Divisions Va, XIVa, and XIVb. Total international landings (tonnes). Source: STATLANT database, except bold values which are WG best estimates.
  Va             XIVa     XIVb           Total Va & XIV
Year Faeroe Is. Germany Iceland Norway UK (E, W, NI) UK (Sco) Total Va Germany Norway Total XIVa Faroes Iceland Norway E & W Russia Total XIVb  
1963     5872       10297     NA           NA 5872
1964     3532       7746     NA           NA 3532
1965     2263       6610     NA           NA 2263
1966     2107       4575     NA           NA 2107
1967     2699       5132     NA           NA 2699
1968     4604       6632     NA           NA 4604
1969     4075       6218     NA           NA 4075
1970     4357       6987     NA           NA 4357
1971     3793       8112     NA           NA 3793
1972     2815       6460     NA           NA 2815
1973 3363 576 2366 911 387 4 7607     NA           NA 7607
1974 3172 375 1857 893 224 6 6527     NA           NA 6527
1975 2445 384 1673 975 244 10 5731     NA           NA 5731
1976 2397 334 2935 1352 92 2 7112     NA           NA 7112
1977 2818 212 3122 1796 0 0 7948     NA           NA 7948
1978 2168 0 3352 812 0 0 6332     NA           NA 6332
1979 2050 0 3558 845 0 0 6453     NA           NA 6453
1980 2873 0 3089 928 0 0 6890     NA           NA 6890
1981 2624 0 2827 1025 0 0 6476     NA           NA 6476
1982 2410 0 2804 666 0 0 5880     NA           NA 5880
1983 4046 0 3469 772 0 0 8287     NA           NA 8287
1984 2008 0 3430 254 0 0 5692     NA           NA 5692
1985 1885 0 3068 111 0 0 5064     NA           NA 5064
1986 2811 0 2548 21 0 0 5380     NA           NA 5380
1987 2638 0 2987 19 0 0 5644     NA           NA 5644
1988 3757 0 3087 20 0 0 6864 2   2     - -   NA 6866
1989 3908 0 3158 10 0 0 7076 1   1 19 3 - -   22 7099
1990 2475 0 4816 0 0 0 7291 2   2 13 10 7 -   30 7323
1991 2286 0 6446 0 0 0 8732 2   2 - 64 68 1   133 8867
1992 1567 0 6442 0 0 0 8009 +   + - 82 120 +   202 8211
1993 1329 0 4729 0 0 0 6058 +   + - 27 53 +   80 6138
1994 1212 0 4615 0 0 0 5827 -   + - 9 16 +   25 5852
1995 979 1 5245 0 0 0 6225 -   + - 57 30 +   87 6312
1996 872 1 5226 3 0 0 6102     + - 139 142     281 6383
1997 575 0 4814 0 0 0 5389   - + - 10 108     118 5507
1998 1052 1 4118 0 0 0 5171   - + 1 - 14     15 5186
1999 1035 2 5795 391 0 1 7224   + + - n.a. 9     9 7233
2000 1302 0 4711 374 1 0 6388   - -     11     11 6399
2001 1125 1 3392 285 5 0 4808   0 0 3   69     72 4880
2002 1269 0 3906 372 1 1 5549 - - - 4 28 30     62 5611
2003 1163 1 4030 373 1 1 5569 - - -     88     88 5657
2004 1478 1 3124 214 1 0 4818           40     40 4858
2005 1157 3 3534 303 4 0 5001   5 5 7   36   8 51 5057
2006 1239 2 5060 299 1 0 6601   0 0 3   19   51 73 6674
20071) 1305   5986 300 1 0 7592   0 0     40   6 46 7638


Figure 9.4.12.2.1. Tusk in Divisions Va, XIVa, and XIVb. Total landings. 2007 is a preliminary value.


Figure 9.4.12.2.2.2 Tusk. Indices from the groundfish survey in March 1985–2008. a) Abundance of fish smaller than 40 cm, b) Biomass of fish 40 cm and larger. The shaded area shows 1 standard error of the estimate.


Figure 9.4.12.2.3.

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

Exploitation boundaries in relation to existing management plans

Surveys indicate that the overall biomass is increasing but consists mostly of small individuals. ICES reiterates the earlier advice to constrain catches to 5000 t (average 2001–2004) to allow the juveniles to recruit to the adult stock. ICES also recommends to collect information that can be used to evaluate a long-term sustainable level of exploitation.
Management
 
Management Advice

Management considerations

Tusk is largely caught as a bycatch in the Icelandic longline fisheries. Tusk is caught both in shelf areas and on the continental slope.
Biological State and Trend
Exploitation rate: Undefined
Abundance level: Undefined

The state of the stock is unknown. Recruitment has increased from a low level in 1995. There are indications that fishing mortality may have declined in recent years.
Source of information
 
ICES.2009.Report of the ICES Advisory Committee, 2009. ICES Advice, 2009.
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