Advice and Scenarios Database



Whiting (Merlangius merlangus) in Subarea 4 and Division 7.d (North Sea and eastern English Channel)
StockCode
whg.27.47d
Assessment Year
2022
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
17325
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.19457411.v1






Catch scenarios


Basis
Total catch
Total projected landings
Total projected discards*
Total IBC*
Human Consumption catch
Total F (ages 2–5)+
F (projected landings, ages 2–5)
F (projected discards, ages 2–5)
F (IBC, ages 2–5)++
SSB
% SSB change^
% advice change^^
2023 2023 2023 2023 2023 2023 2023 2023 2023 2024 2024 2024
(t) (t) (t) (t) (t) (ratio) (ratio) (ratio) (ratio) (t) (%) (%)
ICES Basis Advice
MSY approach: F = FMSY 110172 71182 35711 3280 106892 0.39 0.26 0.12 0.01 244860 -16.8 25
Other scenarios
F = FMSY upper 132198 85910 43146 3142 129055 0.47 0.31 0.15 0.01 228596 -22 50
F = FMSY lower 82366 52587 26325 3454 78912 0.29 0.19 0.09 0.01 265392 -9.8 -6.9
F = 0 (IBC only) 3941 0 0 3941 0 0.01 0 0 0.01 323506 10 -96
F = F2022 46850 28838 14336 3675 43174 0.16 0.1 0.05 0.01 291617 -0.87 -47
Rollover TAC 38059 22959 11370 3730 34328 0.13 0.08 0.04 0.01 298109 1.34 -57
15% TAC decrease (27.4 only) 32941 19536 9643 3762 29179 0.11 0.07 0.03 0.01 301888 2.6 -63
15% TAC increase (27.4 only) 43176 26381 13096 3698 39478 0.15 0.09 0.04 0.01 294330 0.053 -51
0.75 × F2022+++ 36570 21964 10866 3740 32830 0.13 0.08 0.04 0.01 299207 1.71 -59
1.25 × F2022+++ 57135 35716 17808 3611 53524 0.2 0.13 0.06 0.01 284022 -3.5 -35
Fpa 132198 85910 43146 3142 129055 0.47 0.31 0.15 0.01 228596 -22 50
Flim 259393 170964 86081 2348 257045 0.94 0.63 0.3 0.01 134676 -54 193
SSB (2024) = Bpa= MSYBtrigger 239816 157873 79473 2470 237346 0.87 0.58 0.27 0.01 148888 -49 171
SSB (2024) = Blim 296251 195610 98522 2118 294133 1.07 0.72 0.34 0.01 107146 -63 235




Symbol Footnotes
* The split of catch between landings, discards, and industrial bycatch (IBC) in 2023 was done using recent (2019–2021) partial age-dependent fishing mortalities as a forecasting assumption.
^ SSB 2024 relative to SSB 2023.
^^ Total catch 2023 relative to the advice value 2022 (88 426 tonnes).
+ Total F is calculated as the sum of partial fishing mortalities.
++ F (IBC) is assumed to be constant in all scenarios at status quo value.
+++ Multiplier only applied to F (discards) and F (landings), with F (IBC) constant.