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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)
StockCode (Assessment Component)
wit.27.3a47d
Assessment Year
2022
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
18119
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.23284379
Status:
Expired
Advice Component
Advice Category
*
FMSYranges
MP
MSY
NoAdv
Other
PA
Advice Type
*
Catches
Effort
FishMort
Landings
NoAd
NoFish
Advice Unit
*
t
ratio
%
AdviceValue
*
Advice Value Lower Range
Advice Value Upper Range
Wanted Catch
Wanted Catch Lower Range
Wanted Catch Upper Range
Advice Sentence
*
Please note: The present advice replaces the advice given in June 2022 for catches in 2023. ICES advises that when the MSY approach is applied, catches in 2023 should be no more than 1198† tonnes. Management of witch and lemon sole under a combined species TAC prevents effective control of the single-species exploitation rates and could lead to the overexploitation of either species. ICES advises that management should be implemented at the species level in the entire stock distribution area (Subarea 4 and divisions 3.a and 7.d). †Advice correction: a mistake was found in the way the age-specific survey indices were included in the assessment model. The issue was corrected and new reference points were calculated following the procedure detailed in the interbenchmark process (ICES, 2021).
Advice Released Date
*
Advice Applicable From
*
Advice Applicable Until
*
TAF Link
Management Alignment
Full
Multiple
Other
Partial
MP WebLink
Management Plan Ownership
Link To Evaluation
Inquiries or Comments?
Email:
Message:
Catch scenarios
Basis
Total catch^^
Projected landings
Projected discards*
Ftotal ages 4–8
SSB^
SSB^
% SSB change**
% advice change***
2023
2023
2023
2023 2024
2023
2024
2023
2023
(t)
(t)
(t)
(ratio)
(t)
(t)
(%)
(%)
ICES Basis Advice
MSY approach: FMSY × SSB(2022)/MSY Btrigger
1198
1099
99
0.116
4396
5952
35
-0.66
Other scenarios
FMSYlower × SSB(2022)/MSY Btrigger
830
760
70
0.079
4467
6234
37
-31
F=0
0
0
0
0
4645
6894
43
-100
Fpa
2584
2361
223
0.267
4113
4994
26
114
Flim
3119
2845
274
0.331
4003
4651
23
159
Fsq
2922
2666
256
0.31
4042
4774
24
142
SSB (2024)=Blim
5476
4938
538
0.66
3477
3293
6.9
350
SSB (2024)=Bpa
3242
2955
287
0.35
3977
4576
22
169
SSB (2024)=MSYBtrigger
3242
2955
287
0.35
3977
4576
22
169
Rollover advice
1206
1106
100
0.117
4395
6047
35
0
FMSY
1652
1512
140
0.163
4304
5634
32
37
FMSY lower
1150
1055
95
0.111
4405
5987
35
-4.6
Symbol
Footnotes
*
Including BMS landings, assuming recent discard rate (average of 2019–2021).
**
SSB in 2023 relative to SSB in 2022 (3253 tonnes).
***
Advice value for 2023 relative to advice value for 2022 (1206 tonnes).
^
SSB is estimated at spawning time (1 July).
^^
Other scenarios do not include FMSY upper because SSB (2022) less than MSY Btrigger.
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