Advice and Scenarios Database



Herring (Clupea harengus) in subdivisions 20-24, spring spawners (Skagerrak, Kattegat, and western Baltic)
StockCode
her.27.20-24
Assessment Year
2024
Stock Category
1.2
Purpose
Advice
Published
Stock Assessment Key
18526
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.25019273.v1






Catch scenarios


Basis
Total catch
F3–6
SSB*
SSB*
% SSB change **
% advice change ***
2025 2025 2025 2026 2026 2025
(t) (ratio) (t) (t) (%) (%)
ICES Basis Advice
MSY approach: zero catch 0 0 79917 91000 14 0
Other scenarios
EU Baltic Sea multiannual plan (MAP): F=FMSY× 24741 0.149 77112 68886 -11
SSB2024/MSYBtrigger ^
MAP: F=FMSYlower× 18656 0.104 77940 74124 -4.9
SSB2024/MSYBtrigger ^
F=FMSY 40880 0.31 74310 55747 -25
F=Fpa 48341 0.41 72678 49870 -31
F=Flim 50989 0.45 72046 47828 -34
SSB (2026)=Blim ^^
SSB (2026)=Bpa ^^
SSB (2026)=MSYBtrigger ^^
F=F2024 7389 0.036 79220 84256 6.4
Catch of WBSS by A-fleet and D-fleet only^^^ 5021 0.02 79456 86631 9
F=0 0 0 79917 91000 14
F = 0.010 2171 0.01 79722 89003 12
F = 0.025 5253 0.025 79432 86190 8.5
F=0.050 9969 0.05 78952 81938 3.8
F=0.100 18093 0.1 78012 74769 -4.2
F=0.150 24860 0.15 77095 68950 -11
Constant catch 2024–2026^^^^ 6078 0.029 79353 85585 7.9




Symbol Footnotes
* For spring-spawning stocks, the SSB is influenced by fisheries and natural mortality between 1January and spawning time (April).
** SSB (2026) relative to SSB (2025).
*** The advised catch for 2024 was 0tonnes.
^ Because SSB2024 is below MSYBtrigger, the FMSY and FMSYlower values in the MAP are adjusted by the SSB2024/MSYBtrigger ratio.
^^ Blim and Bpa cannot be achieved in 2026, even with zero catch.
^^^ Only (i) the A-fleet that targets North Sea autumn-spawning (NSAS) herring but also catches WBSS herring in the eastern part of the North Sea and (ii) the D-fleet that targets fish for reduction in Division 3.a, assuming the same catch as in the intermediate year 2024. C-fleet and F-fleet are directed WBSS fisheries, thus have zero catch in this scenario.
^^^^ It is assumed that the fleets’ 2024 catches (as defined in Table1) are kept constant for 2025–2026.