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Witch (Glyptocephalus cynoglossus) in Subarea 4 and divisions 3.a and 7.d (North Sea, Skagerrak and Kattegat, eastern English Channel)
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Species:
Glyptocephalus cynoglossus
Stock code:
wit.27.3a47d
Assessment Year:
2021
Purpose:
Advice
Assessment Key:
16770
Stock Key:
169309
Year
Recruitment
97.5%
2.5%
Spawning Stock Biomass (SSB)
97.5%
2.5%
Landings
Discards
Fishing pressure
97.5%
2.5%
Age 1
Ages 4-8
thousands
tonnes
tonnes
tonnes
Year-1
1950
29065
47324
17851
3881
8397
1794
2379
0.27
0.52
0.141
1951
29811
47749
18612
3778
8258
1728
2568
0.28
0.55
0.146
1952
32116
50654
20363
3609
8092
1610
2554
0.29
0.57
0.145
1953
34617
54000
22191
3443
7983
1485
2263
0.28
0.56
0.134
1954
35344
55666
22441
3372
7984
1424
1590
0.25
0.52
0.116
1955
33673
54310
20878
3388
8044
1427
2027
0.25
0.53
0.121
1956
29653
48833
18006
3435
8042
1468
1936
0.25
0.52
0.122
1957
25612
42730
15352
3504
7977
1540
1991
0.26
0.52
0.129
1958
22818
37561
13862
3498
7772
1574
2678
0.29
0.56
0.149
1959
21057
34230
12954
3374
7435
1531
2333
0.30
0.58
0.154
1960
19398
32081
11729
3154
7053
1410
2563
0.31
0.61
0.162
1961
17572
29535
10454
2889
6664
1253
2093
0.30
0.61
0.151
1962
15838
26542
9451
2679
6333
1133
1419
0.27
0.56
0.134
1963
14422
24317
8554
2501
5999
1043
1523
0.28
0.58
0.138
1964
13149
22822
7576
2281
5575
933
1760
0.31
0.63
0.150
1965
12349
21873
6971
2047
5118
819
1356
0.30
0.63
0.143
1966
12632
21974
7262
1847
4725
722
1137
0.29
0.63
0.137
1967
14375
23981
8617
1668
4400
633
1125
0.30
0.67
0.137
1968
17980
28696
11265
1502
4152
544
1174
0.31
0.72
0.136
1969
21948
34704
13881
1388
4016
479
891
0.28
0.69
0.116
1970
25069
40142
15656
1374
4011
471
597
0.24
0.60
0.096
1971
25927
41656
16138
1452
4094
515
843
0.25
0.60
0.102
1972
26222
42688
16108
1592
4217
601
908
0.25
0.59
0.110
1973
26270
42863
16100
1764
4375
711
1494
0.28
0.61
0.131
1974
27101
44290
16583
1943
4562
827
1138
0.27
0.57
0.129
1975
29507
47917
18170
2098
4770
922
1841
0.30
0.60
0.147
1976
34091
54277
21413
2206
4952
983
1496
0.29
0.58
0.142
1977
41829
64762
27017
2317
5175
1037
1618
0.28
0.57
0.142
1978
50905
77608
33390
2445
5423
1102
1664
0.28
0.55
0.139
1979
58106
90761
37200
2644
5730
1221
1572
0.26
0.51
0.134
1980
60432
96782
37735
2949
6095
1427
1883
0.26
0.49
0.140
1981
58930
94557
36726
3370
6501
1746
1933
0.26
0.47
0.147
1982
56863
90757
35627
3834
6857
2144
3155
0.30
0.49
0.180
1983
55891
88492
35300
4209
7044
2515
3606
0.32
0.50
0.20
1984
57238
89390
36650
4438
7110
2771
3903
0.33
0.51
0.22
1985
58287
89900
37790
4537
7116
2893
3979
0.33
0.50
0.22
1986
58026
90152
37348
4586
7132
2949
3579
0.32
0.48
0.22
1987
54234
85743
34304
4634
7171
2995
3700
0.32
0.48
0.21
1988
49434
79238
30840
4715
7231
3074
3290
0.31
0.45
0.21
1989
45694
73011
28598
4801
7256
3176
3841
0.31
0.45
0.22
1990
44958
70584
28636
4806
7143
3233
3862
0.31
0.45
0.22
1991
46234
71045
30087
4751
6958
3244
3641
0.30
0.43
0.22
1992
49519
74993
32699
4672
6773
3223
3164
0.29
0.40
0.20
1993
52277
79204
34505
4638
6691
3215
2673
0.27
0.38
0.187
1994
54223
83471
35224
4661
6709
3238
2696
0.26
0.37
0.183
1995
54388
84056
35191
4739
6807
3299
2810
0.26
0.37
0.183
1996
53757
82273
35124
4832
6915
3376
2790
0.27
0.38
0.189
1997
51498
78363
33842
4873
6969
3408
3494
0.30
0.42
0.21
1998
48392
74156
31579
4766
6863
3309
3786
0.33
0.48
0.23
1999
44815
69284
28987
4509
6598
3082
4024
0.37
0.54
0.26
2000
42720
66044
27632
4124
6134
2773
4422
0.42
0.60
0.29
2001
43621
65416
29088
3690
5506
2473
4206
0.44
0.63
0.31
2002
43110
63060
29471
3272
4811
2225
3813
0.46
0.64
0.33
2003
38816
55668
27065
2937
4168
2069
3308
0.46
0.62
0.34
2004
29631
41807
21001
2698
3641
1999
3059
0.45
0.59
0.34
2005
25439
35306
18329
2566
3280
2008
2960
0.43
0.55
0.34
2006
27796
36762
21017
2510
3070
2052
2335
0.39
0.48
0.32
2007
24932
34712
17908
2473
2936
2083
2271
0.37
0.45
0.31
2008
38313
48702
30140
2378
2779
2035
1999
0.36
0.44
0.30
2009
58489
74182
46115
2209
2577
1893
1894
409
0.37
0.45
0.31
2010
51592
65329
40744
2188
2566
1866
1550
524
0.32
0.40
0.26
2011
34908
44892
27144
2432
2851
2073
1772
448
0.25
0.32
0.20
2012
32987
42485
25613
2891
3384
2470
2153
447
0.22
0.28
0.178
2013
36634
47265
28393
3512
4125
2989
2033
225
0.23
0.29
0.185
2014
32553
42388
25000
3958
4709
3327
2741
251
0.27
0.34
0.22
2015
24529
32776
18357
4119
4990
3400
2363
399
0.26
0.32
0.20
2016
21361
30359
15030
4165
5153
3366
3025
287
0.26
0.33
0.20
2017
32642
46835
22750
4117
5266
3219
3360
150
0.29
0.38
0.22
2018
36419
56167
23615
3930
5294
2917
3141
152
0.29
0.40
0.21
2019
48472
80414
29218
3643
5237
2535
2707
183
0.30
0.43
0.20
2020
42309
78854
22700
3415
5247
2222
1980
184
0.28
0.43
0.180
2021
36419
3562
Average
36906
56640
24214
3294
5732
2018
2443
305
0.30
0.51
0.190
Fishing pressure
Stock size
2018
2019
2020
2019
2020
2021
Maximum sustainable yield
F
MSY
Above
MSY B
trigger
Below trigger
Precautionary approach
F
pa
,F
lim
Increased risk
B
pa
,B
lim
Increased risk
Management plan
F
MGT
Not applicable
B
MGT
Not applicable