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Stock Assessment Graphs
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Megrim (Lepidorhombus spp.) in divisions 4.a and 6.a (northern North Sea, West of Scotland)
Species:
Stock Assessment Graphs
Stock code:
lez.27.4a6a
Assessment Year:
2018
Key:
9871
Unit weights
tonnes
Unit recruitment
thousands
Fishing pressure description
F/Fmsy
Fishing pressure units
ratio
Stock size description
B/Bmsy
Stock size units
ratio
Fish reference points
Management plan
SSB
MP
F
MP
MSY approach
MSYB
trigger
0.5
F
MSY
1
Precautionary approach
B
lim
0.3
B
pa
0.5
F
lim
F
pa
Age and Length
Recruitment
0
F
Fish data
Year
Low SSB
SSB
High SSB
Landings
Catches
Discards
Low F
F
High F
1985
0.437915511576826
2.0930843961594
3.69878561854406
4499
6427
0.356604445629483
0.782824979240308
1.65521019428974
1986
0.398521261901479
1.51361741256793
2.28597032684579
2858
4051
0.300105116593291
0.588696797451733
1.09642024218359
1987
0.38306524860724
1.41377502343776
2.0745534456209
4614
6488
0.542679976957326
1.03334181693299
1.92492388632127
1988
0.369086339249228
1.34424189537394
2.11856499646495
5212
7273
0.57726624059331
1.25351728499791
2.28685830985754
1989
0.325924491259768
1.07745112311922
1.60861761474877
3451
4778
0.462973130911081
0.961421382323969
1.78075362675859
1990
0.308668173224267
0.979255907198761
1.42979543509066
3047
4187
0.43679604049953
0.906519406023678
1.74020785559031
1991
0.317513898470421
0.91563602364718
1.32974312882553
3310
4514
0.53518377061056
1.05014915005577
1.99725130872479
1992
0.329789408236195
0.978455183013884
1.4295944201686
3574
4837
0.535524863533971
1.06143572713431
1.92363690187338
1993
0.337997349201008
1.05779418615137
1.55473875091723
3802
5107
0.520252013741762
1.04904341815999
1.94922103361377
1994
0.353566153775391
1.16918566397557
1.8549140666859
3900
5200
0.446821929200178
0.978461116367185
1.811423893467
1995
0.352521874639877
1.18866973907073
1.86307067957698
4670
6181
0.539803915945897
1.16947705547523
2.18895529829989
1996
0.338258892042123
1.14828176546703
1.84082754379563
5253
6902
0.604163995554253
1.38349942244393
2.52986090201961
1997
0.307445992025601
0.958317779244107
1.42119219873917
4856
6334
0.698441992748778
1.48485573360764
2.70159266588637
1998
0.277100335420711
0.919940137066883
1.42259759811428
4253
5507
0.599077901656497
1.33077562557224
2.45007613195425
1999
0.265077909194837
0.890306175939108
1.38665629516692
3759
4833
0.52732318841454
1.19506756954677
2.21408790258448
2000
0.249454837573484
0.827477755725134
1.28641539760667
3494
4460
0.512191515047371
1.17188939576517
2.13711238169472
2001
0.236635240949297
0.764656579563415
1.18118482149677
3571
4527
0.582185822663438
1.28886018038996
2.4110806423298
2002
0.240782780386356
0.775440018989906
1.19459418111097
2803
3528
0.445748422096418
0.964116559965287
1.76968305644768
2003
0.236118476628627
0.807824652945324
1.33007923189084
2369
2961
0.337952506708829
0.76910733596533
1.41841384279577
2004
0.244766333942052
0.807748173227155
1.24005988793358
2067
2566
0.304231305524149
0.652010793526324
1.19625922040657
2005
0.236500812442265
0.796032063299361
1.16824408501533
1527
1883
0.24058087810136
0.468493536385802
0.909568178529046
2006
0.263497678690261
0.897526445259375
1.28854960898023
2054
2515
0.296841279207457
0.567167806999358
1.11120559120415
2007
0.311540211434494
1.02057364630875
1.47280967874508
2348
2856
0.299101875296686
0.57538677027419
1.08703025678483
2008
0.329830449104664
1.13149915767182
1.61853014741316
2894
3496
0.33374955871739
0.646814130479826
1.24849202639016
2009
0.381378468737683
1.24480312010359
1.80732860138829
2871
3445
0.301192125911751
0.581969928620326
1.11211504064394
2010
0.391821199371555
1.26457533780999
1.75687857454219
3197
3811
0.343910862104947
0.63495391384233
1.14530534879476
2011
0.426052637956837
1.30203355946664
1.84888711859525
3257
3857
0.341051140315194
0.626156681648482
1.13299016277027
2012
0.46644359393975
1.42191938216273
2.06022437666923
2545
3186
0.258226808266053
0.472038241475987
0.849046542748094
2013
0.525517939128423
1.6172987134506
2.4907216137572
2737
3064
327
0.214327203732591
0.407013649496306
0.733194458887015
2014
0.518906647035521
1.62391954105213
2.34604159606574
2500
2809
309
0.202546418073718
0.367467729026792
0.64551740778452
2015
0.49533312600809
1.50622531740389
2.093895299748
2471
2623
152
0.208486685182004
0.361426339736931
0.615733661355582
2016
0.586012957075403
1.6075450817176
2.26067310359121
2792
2959
167
0.221676053273476
0.385748338860207
0.64234441447324
2017
0.664126639809409
1.78204590604469
2.70926642556393
2594.48587
2787.70876
193.22289
0.178252875207667
0.3333519751756
0.560147488421997
Custom reference points
CustomRefPointName
CustomRefPointValue
CustomRefPointNotes
custom1
custom2
custom3
custom4
custom5
Custom fish data column names
Custom fish data
Sensivity data