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
2023
Stock Category
1.2
Purpose
Advice
Published
Stock Assessment Key
17746
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.21907944.v1






Catch scenarios


Basis
Total catch
F3–6
SSB*
SSB*
% SSB change **
% advice change ***
2024 2024 2024 2025 2025 2024
(t) (ratio) (t) (t) (%) (%)
ICES Basis Advice
MSY approach: zero catch 0 0 92726 103649 12 0
Other scenarios
EU Baltic Sea multiannual plan (MAP): F=FMSY× SSB2023/MSYBtrigger ^ 27346 0.177 90148 80228 -11
MAP: F=FMSYlower× SSB2023/MSYBtrigger ^ 19958 0.123 90919 86404 -5
F=FMSY 43103 0.31 88265 67575 -23
F=Fpa 52915 0.41 86889 59887 -31
F=Flim 56452 0.45 86347 57171 -34
SSB (2025)=Blim ^^
SSB (2025)=Bpa ^^
SSB (2025)=MSYBtrigger ^^
F=F2023 7669 0.044 92074 96985 5
Catch of WBSS by A- and D-fleets only ^^^ 5436 0.028 92275 99119 7
F = 0.010 1800 0.01 92577 102077 10
F = 0.025 4436 0.025 92355 99783 8
F=0.050 8667 0.05 91986 96126 5
F=0.100 16559 0.1 91254 89386 -2
F=0.150 23768 0.15 90529 83326 -8
Constant catch 2023–2025 ^^^^ 6663 0.038 92162 97926 6




Symbol Footnotes
* For spring-spawning stocks, the SSB is determined at spawning time and is influenced by fisheries and natural mortality between 1 January and spawning time (April).
** SSB (2025) relative to SSB (2024).
*** The advised catch in 2022 was 0 tonnes.
^ Because SSB2023 is below MSY Btrigger, the FMSY and FMSY lower values in the MAP are adjusted by the SSB2023/MSY Btrigger ratio.
^^ Blim and Bpa cannot be achieved in 2025, even with zero catch.
^^^ Only 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 the D-fleet that targets fish for reduction in Division 3.a, assuming the same catch as in the intermediate year 2023 (C- and F-fleets are directed WBSS fisheries so have zero catch in this scenario).
^^^^ It is assumed that the fleets’ 2023 catches (as defined in Table 1) are kept constant for 2024–2025.