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Plaice - Skagerrak and Kattegat, 2008
Marine Resource  Fact Sheet
ICES Advice 2009
Plaice - Skagerrak and Kattegat, 2008
Fact Sheet Citation  
Plaice in Division IIIa (Skagerrak - Kattegat)
Owned byInternational Council for the Exploration of the Sea (ICES) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
FAO Names: en - European plaice, fr - Plie d'Europe, es - Solla europea, ru - Камбала морская
Geographic extent of Plaice - Skagerrak and Kattegat
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Sub-Regional
Management unit: Yes
 
 
Habitat and Biology
Depth zone: Shelf (50 m - 200 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
Assessment
 
Overall Assessment Results


Table 6.4.6.1 Plaice in Kattegat. Landings in tonnes. Working Group estimates, 1972–2008.
Year Denmark Sweden Germany Belgium Norway Total
1972 15,504 348 77     15,929
1973 10,021 231 48     10,300
1974 11,401 255 52     11,708
1975 10,158 296 39     10,493
1976 9,487 177 32     9,696
1977 11,611 300 32     11,943
1978 12,685 312 100     13,097
1979 9,721 333 38     10,092
1980 5,582 313 40     5,935
1981 3,803 256 42     4,101
1982 2,717 238 19     2,974
1983 3,280 334 36     3,650
1984 3,252 388 31     3,671
1985 2,979 403 4     3,386
1986 2,470 202 2     2,674
1987 2,846 307 3     3,156
1988 1,820 210 0     2,030
1989 1,609 135 0     1,744
1990 1,830 202 2     2,034
1991 1,737 265 19     2,021
1992 2,068 208 101     2,377
1993 1,294 175 0     1,469
1994 1,547 227 0     1,774
1995 1,254 133 0     1,387
1996 2,337 205 0     2,542
1997 2,198 255 25     2,478
1998 1,786 185 10     1,981
1999 1,510 161 20     1,691
2000 1,644 184 10     1,838
2001 2,069 260       2,329
2002 1,806 198 26     2,030
2003 2,037 253 6     2,296
2004 1,395 137 77     1,609
2005 1,104 100 47     1,251
2006 1,355 175 20     1,550
2007 1,198 172 10     1,380
2008 866 137 6     1,008
             
* years 1972-1990 landings refers to IIIA      


Table 6.4.6.2 Plaice in Skagerrak. Landings in tonnes. Working Group estimates, 1972–2008
Year Denmark Sweden Germany Belgium Norway Netherlands Total
1972 5,095 70     3   5,168
1973 3,871 80     6   3,957
1974 3,429 70     5   3,504
1975 4,888 77     6   4,971
1976 9,251 51   717 6   10,025
1977 12,855 142   846 6   13,849
1978 13,383 94   371 9   13,857
1979 11,045 67   763 9   11,884
1980 9,514 71   914 11   10,510
1981 8,115 110   263 13   8,501
1982 7,789 146   127 11   8,073
1983 6,828 155   133 14   7,130
1984 7,560 311   27 22   7,920
1985 9,646 296   136 18   10,096
1986 10,645 202   505 26   11,378
1987 11,327 241   907 27   12,502
1988 9,782 281   716 41   10,820
1989 5,414 320   230 33   5,997
1990 8,729 779   471 69   10,048
1991 5,809 472 15 315 68   6,679
1992 8,514 381 16 537 106   9,554
1993 9,125 287 37 326 79   9,854
1994 8,783 315 37 325 91   9,551
1995 8,468 337 48 302 224   9,379
1996 7,304 260 11   428   8,003
1997 7,306 244 14   249   7,813
1998 6,132 208 11   98   6,449
1999 6,473 233 7   336   7,049
2000 6,680 230 5   67   6,982
2001 9,045 125     61   9,231
2002 6,470 140 3   58   6,671
2003 4,847 143 8   74 1,584 6,656
2004 5,717 179     106 1,511 7,513
2005 4,515 144     116 915 5,690
2006 6,334 175 14   142 1,190 7,855
2007 5,467 159 21   100 1,659 7,406
2008 6,901 219 5   79 403 7,607


Scientific Advice

Single-stock exploitation boundaries

As in 2008, the new analysis available for this stock has not given a reason to change the advice from 2007. The advice on this stock for the fishery in 2010 is therefore the same as the advice given over the last 2 years: “Landings should not exceed the level recorded in 2006 of 9400 t.”

In addition, ICES offers the following consideration:

In 2007, ICES identified key issues that would need to be resolved before reaching further improvements in the assessment. The various surveys give a reasonably consistent result for the eastern part of the area. The status of the western part is more uncertain, due to potential mixing with North Sea plaice and limited survey coverage. The landings-at-age matrix does not show proper tracking of the cohorts, probably due to i) mixing of the IIIa stock with the North Sea plaice stock on the main fishing ground in southwestern Skagerrak, and ii) uncertainty in ageing due to low sampling levels.

In 2009, ICES still considered these issues as outstanding, although uncertainty due to age reading is likely to have decreased in the recent years.

This advice will be updated in 2011.


Year ICESAdvice Single-stock Exploitation Boundaries Predicted catch corresp. to advice Agreed TAC Kattegat Agreed TAC Skagerrak ICESLandings
1992 TAC   14.0 2.8 11.2 11.9
1993 Precautionary TAC   - 2.8 11.2 11.3
1994 If required, precautionary TAC   - 2.8 11.2 11.3
1995 If required, precautionary TAC   - 2.8 11.2 10.8
1996 If required, precautionary TAC   - 2.8 11.2 10.5
1997 No advice   - 2.8 11.2 10.1
1998 No increase in F from the present level   11.9 2.8 11.2 8.4
1999 No increase in F from the present level   11.0 2.8 11.2 8.5
2000 F < Fpa   11.8 2.8 11.2 8.8
2001 F < Fpa   9.4 2.35 9.4 11.7
2002 F < Fpa   8.51 1.62 6.42 8.7
2003 F < Fpa   18.4 3.0 10.4 8.9
2004 3 F < Fpa 3 1.8 9.5 9.1
2005   F < Fpa < 9.5 1.9 7.6 6.9
2006   No increase in F < 9.6 1.92 7.68 9.4
2007   Maintain current TAC <9.6 2.125 8.5 8.8
2008   No increase in catch <9.4 2.338 9.350 8.6
2009 Same advice as last year No increase in catch <9.4 2.338 9.350  
2010 Same advice as last year No increase in catch <9.4      
Weights in ‘000 t.1) In March 2002 ACFM revised its advice to 11.6 for both areas combined. 2) The TAC for the two areas combined was adjusted to 11 200 tonnes in mid-2002.3) Single-stock boundary and the exploitation of this stock should be conducted in the context of mixed fisheries.


Management
Management unit: Yes
Biological State and Trend
Exploitation rate: Undefined
Abundance level: Undefined
Source of information
 
ICES.2009.Report of the ICES Advisory Committee, 2009. ICES Advice, 2009.
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