Advice and Scenarios Database



Witch (Glyptocephalus cynoglossus) in Subarea 4 and divisions 3.a and 7.d (North Sea, Skagerrak and Kattegat, eastern English Channel)
StockCode
wit.27.3a47d
Assessment Year
2024
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
18728
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.25019732.v1






Catch scenarios


Basis
Total catch
Projected landings
Projected discards*
Ftotal (ages 4-8)
SSB^^
SSB^^,#
% SSB change**
% TAC***
% advice change^
2025 2025 2025 2025 2025 2026 2025 2025 2025
(t) (t) (t) (ratio) (t) (t) (%) (%) (%)
ICES Basis Advice
MSY approach: FMSY 1969 1885 84 0.163 5528 5848 10.6 25 25
Other scenarios
FMSYupper 2596 2484 112 0.222 5337 5328 6.8 64 64
FMSY lower 1380 1324 56 0.111 5699 6366 14 -12.6 -12.6
F=0 0 0 0 0 6088 7656 22 -100 -100
Fpa 3044 2918 126 0.267 5196 4970 4 93 93
F = F2024 1840 1764 76 0.151 5565 5961 11.3 16.5 16.5
SSB (2026) = Blim 5399 5148 251 0.55 4434 3293 -11.3 240 240
SSB (2026) = Bpa= MSY Btrigger 3558 3409 149 0.32 5041 4576 0.86 125 125
Rollover advice 1579 1515 64 0.128 5641 6230 12.9 0 0




Symbol Footnotes
* Including BMS landings. Assuming recent discard rate (average of 2021–2023).
** SSB in 2025 relative to SSB in 2024 (4998 tonnes).
*** Total advised catch in 2025 relative to the combined areas TACs in 2024, including projected third-country catches (1579 tonnes).
# Assuming same Ftotal (ages 4-8) in 2026 as in 2025.
^ Advice value for 2025 relative to advice value for 2024 (1579 tonnes).
^^ SSB is estimated at spawning time (1st July).