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Norway Pout - North Sea, Skagerrak and Kattegat, 2008
Marine Resource  Fact Sheet
ICES Advice 2009
Norway Pout - North Sea, Skagerrak and Kattegat, 2008
Fact Sheet Citation  
Norway pout in Sub-area IV (North Sea) and 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 - Norway pout, fr - Tacaud norvégien, es - Faneca noruega, ru - Тресочка Эсмарка
Geographic extent of Norway Pout - North Sea, 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
Exploitation
 

Factors affecting the fisheries and the stock

Regulations and their effects

The Norway pout fishery is regulated through a single-species TAC and by technical measures such as minimum mesh size in the trawls, fishing area closure in e.g. the Norway pout box in the north-western part of the North Sea, and bycatch regulations in the fishery to protect other species.

The directed fishery for Norway pout was closed in 2005, the first half of 2006 and in 2007. Bycatch regulations in force have reduced bycatches in recent years.
Assessment
 
Assessment Model
Methodology

Scientific basis

Data and methods

The analytical seasonal XSA assessment model fitted for this stock is based on time-series of catch-at-age, one commercial cpue series, and four research survey series. The assessment provides stock status (including 0-group) up to 1st of April 2009. The autumn assessment includes observations from the surveys in the 3rd quarter of 2008 and landings for the first quarter year 2009.

Uncertainties in assessment and forecast

The assessment uses constant natural mortality, although variable mortality has been estimated. There is uncertainty in the maturity-at-age, which may have a large impact on the predictions and estimates of the SSB because the stock consists of very few year classes.

Comparison with previous assessment and advice

The estimates of the SSB and of the average fishing mortality of ages 1 and 2 are consistent with the estimates of previous year’s assessment. The basis of the advice is the same as the advice in May 2009.
Overall Assessment Results


Table 6.4.20.1 Norway pout in Subarea IV (North Sea) and Division IIIa (Skagerrak-Kattegat). Summary of stock assessment (AUTUMN): landings, fishing mortality, recruitment, and SSB.


Figure 6.4.20.2 Norway pout in Subarea IV (North Sea) and Division IIIa (Skagerrak-Kattegat). Precautionary approach plot and stock-recruitment relationship (AUTUMN).


Figure 6.4.20.3 Norway pout in Subarea IV (North Sea) and Division IIIa (Skagerrak–Kattegat). Comparison of current assessment with previous assessments. Retrospective plots of final SXSA assessment (AUTUMN).


Table 6.4.20.2 Norway pout in Subarea IV (North Sea) and Division IIIa (Skagerrak-Kattegat). National landings (t) by quarter (Data provided by Working Group members). Norwegian landing data include landings of bycatch of other species. Includes bycatch of Norway pout in other (small-meshed) fisheries.


Table 6.4.20.3 Norway pout in Subarea IV (North Sea) and Division IIIa (Skagerrak–Kattegat). Summary of stock assessment (SXSA Baseline, September 2009).

Year

Recruitment

Age 0

millions

SSB

tonnes

Landings

tonnes

Mean F

Ages 1-2

1983 220802 369563 457.6 0.873
1984 119296 371187 393.01 1.241
1985 85398 166487 205.1 1.295
1986 158392 87700 174.3 1.096
1987 46300 96254 149.3 0.876
1988 127648 126699 109.3 0.660
1989 135974 85492 166.4 0.812
1990 127714 125481 163.3 0.736
1991 242921 145222 186.6 0.876
1992 103699 174908 297 0.920
1993 72659 218949 183 0.816
1994 308419 119040 182 1.051
1995 97346 117481 237 0.573
1996 235931 295997 164 0.435
1997 67226 193745 169.7 0.590
1998 93816 262649 58 0.291
1999 230253 151325 95 0.654
2000 79951 162987 184 0.585
2001 70810 233895 66 0.269
2002 49267 160206 80 0.506
2003 21847 109373 27 0.249
2004 28380 85507 14 0.156
2005 112085 55260 2 0.000
2006 57961 77117 47 0.258
2007 103532 152908 6 0.020
2008 103206 145974 36 0.122
2009 145089 186149    
Average 120219 165835 148 0.614

Reference Point
 


  Type Value Technical basis
Precautionary approach Blim 90 000 t Bloss, the lowest observed biomass in the 1980s
  Bpa 150 000 t Below-average recruitment when SSB is less than 150 000 t.
  Flim   None advised
  Fpa   None advised
Targets Fy not defined  
(unchanged since 1997)


Projection


Outlook for 2010 Basis: F (2009) = [F Q1&209 + FQ3&408] = 0.240; Catch (2009) = 45; SSB (2010) =200 - R(2010)= 25% percentile of 19832009 2nd quarter ~ 72 Billions.
Rationale Catches (2010) F 2010 SSB (2011) %SSB Change1
  0 0.00 258 29 %
Precautionary 50 0.05 245 23 %
Limits 105 0.11 220 10 %
  208 0.24 183 -9 %
  279 0.35 159 -21 %
  307 0.40 150 -25 %
  332 0.45 142 -29 %
  366 0.52 131 -35 %
  399 0.59 121 -40 %
  480 0.83 98 -51 %

Weights in ‘000 t. Scenarios in italics are not considered consistent with the precautionary approach.

1 SSB 2011 relative to SSB 2010.





Scientific Advice

Single-stock exploitation boundaries

ICES advises on the basis of precautionary limits that in order to maintain the spawning stock biomass above Bpa in 2010 catches should be restricted to less than 307,000 t.


Table 6.4.20.1 Norway pout in Subarea IV (North Sea) and Division IIIa (Skagerrak–Kattegat). Single stock exploitation boundaries (advice), management and landings.
Year

ICES

Advice

Predicted catch corresp. to advice

Agreed

TAC1

Official

Landings

ICES

landings

1987 No advice - 200 215 147
1988 No advice - 200 187 102
1989 No advice - 200 276 167
1990 No advice - 200 212 140
1991 No advice - 200 223 155
1992 No advice - 200 335 255
1993 No advice - 220 241 176
1994 No advice - 220 214 176
1995 Can sustain current F - 180 289 181
1996 Can sustain current F; take bycatches into consid. Account - 220 197 122
1997 Can sustain current F; take bycatches into consid. - 220 155 133
1998 Can sustain current F; take bycatches into consid. - 220 72 62
1999 Can sustain current F; take bycatches into consid. - 220 93 85
2000

Can sustain current F; take bycatches into consid.

- 220 182 175
2001

Can sustain current F; take bycatches into consid.

- 211 63 57
2002

Can sustain current F; take bycatches into consid.

- 198 93 74
2003

Can sustain current F; take bycatches into consid.

  198 24 21
2004

The stock is in risk of decreasing below Blim

  198 16 14
2005 Fishery should be closed   5 1 2
2006 Fishery closed until 4th August where a TAC of 95 000 t was set.

95 54 47
2007 Fishery closed because SSB <Bpa in 2008.   5 6 6
2008 F=0.35 or 50 000 t for first half of 2008 < 50 in 1st 6 m 42.5    
In year2: Maintain SSB > Bpa < 148 115 39 36
2009 Reduce F to increase SSB > Bpa < 35 28.25    
In year: Maintain SSB > Bpa < 157 157    
2010 Maintain SSB > Bpa < 307      

Weights in ‘000 t.

1 Divisions IIa(EU) and IIIa, and Subarea IV(EU).

2 For Norway pout preliminary advice is given in autumn, while the in year advice is given on the basis of the first surveys in the TAC year.



Management
Management unit: Yes

Management Objectives

No management objectives have been set for this stock. Due to the short-lived nature of this species a preliminary TAC is set every year, which is updated on the basis of advice in the first half of the year.
Management Advice

Management considerations

Norway pout is a short-lived species. Recruitment is highly variable and influences SSB and TSB rapidly, due to the short life span of the species. With present fishing mortality levels, the status of the stock is mainly determined by natural processes and less by the fishery.

Historically, the fishery includes bycatches especially of haddock, whiting, saithe, and herring. Existing technical measures to protect these bycatch species should be maintained or improved. Bycatches of these species have been low in the recent decade. Studies have shown that sorting grids in combination with square mesh panels reduce bycatches of whiting and haddock by 57% and 37%, respectively (Eigaard and Holst, 2004; ICES 2006a ICES CM 2006/ACFM:35; Eigaard and Nielsen, 2009); ICES suggests that these devices should be brought into use in the fishery. The introduction of these technical measures should be followed up by adequate control measures to ensure effective implementation of the existing bycatch measures. The Norwegian fishery for Norway pout in 2009 has been extended to the 1st of November provided the use of sorting grids.

Despite opening of the fishery by 1st January 2008 (with preliminary EU quota of 36 500 t and a Norwegian quota of 4 750 t as well as a final EU quota of 110 000 t set late in 2008) only 36 100 t was taken in total. Based on the assumed average 2008 recruitment ICES in May 2009 advised a TAC on 157 000 t for 2009. An initial EU quota of 26 000 t and a Norwegian quota of 1 000 t for by-catch was set for the first half year 2009. Catches in 1st half of 2009 amount to only 4 200 t, which was dominated by Norwegian by-catch (3 700 t) in the mixed blue whiting and Norway pout fishery. The final TAC for 2009 was set at 157 000 t (following the escapement strategy) of which 117 300 t (app. 75%) is EU quota.

The catch forecast for 2010 assumes status quo fisheries in 2009, with catches of 45 000 t. This is well below the quota for 2009 (157 000 t). In case the quota are fully taken in 2009 this will result in lower catch forecasts for 2010 (226 000 t to reach Bpa by 2011).

There is bi-annual information available to perform real time monitoring and management of the stock. This can be carried out both with fishery independent and fishery dependent information as well as a combination of those. Real time advice (forecast) and management options for 2010 will be provided for the stock in spring 2010 as well.

Management plan evaluations

No management plan has been agreed, but ICES has evaluated and commented on three management strategies, following requests from managers – fixed fishing mortality (0.35), fixed TAC (50 000 t), and a variable TAC escapement strategy. The evaluation shows that all three management strategies are capable of generating stock abundance that stay above Blim with a high probability in the long term and are therefore considered to be in accordance with the precautionary approach.

The choice between different strategies depends on the requirements that fisheries managers and stakeholders have regarding stability in catches or the overall level of the catches. The escapement strategy has a higher long-term yield compared to the fixed fishing mortality strategy, but at the cost of a substantially higher probability of having closures in the fishery. If the continuity of the fishery is an important property, then the fixed F (equivalent to fixed effort) strategy will perform better.

Under a fixed F-management-strategy with F around 0.35 a catch of no more than 279 000 t can be taken in 2010. Under a fixed TAC strategy a TAC of 50 000 t can be taken in 2010 according to the long term management strategies for the stock.

Impacts of fisheries on the ecosystems

Norway pout is an important prey species for a variety of fish species (e.g. saithe, haddock, and mackerel). Natural mortality levels by age and season used in the stock assessment do reflect the predation mortality levels estimated for this stock in the most recent multi-species stock assessment performed by ICES (ICES 2006b). Growth and mean weight-at-age for the above-mentioned predators seems independent of the stock size of Norway pout.

Historically, the fishery includes bycatches especially of haddock, whiting, saithe, and herring. Bycatches of these species have been low in the recent decade.
Biological State and Trend
Exploitation rate: Undefined
Abundance level: Full reproductive capacity


Spawning biomass in relation to precautionary limits Fishing mortality in relation to precautionary limits Fishing mortality in relation to high long-term yield

Fishing mortality in relation to

agreed target

Comment

Full reproductive capacity Undefined Undefined NA  



The most recent estimates of SSB (Q3 2009) show full reproductive capacity of the stock (SSB>Bpa). Catches and fishing mortality has been low in 2008 and first half year 2009. Fishing mortality has generally been lower than the natural mortality for this stock and has decreased in recent years well below the long term average F (0.6). Recruitment in 2008 was just below the long term average and in 2009 was above average.
Source of information
 
ICES.2009.Report of the ICES Advisory Committee, 2009. ICES Advice, 2009.
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