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
2020
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
13313
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.5928






Catch scenarios


Basis
Total catch
F3–6
SSB*
SSB*
% SSB change **
% advice change ***
2021 2021 2021 2022 2022 2022
(t) (ratio) (t) (t) (%) (%)
ICES Basis Advice
MSY approach: zero catch 0 0 66824 87890 32 0
Other scenarios
MAP^: F = FMSY × SSB2020/MSYBtrigger 10273 0.118 65973 77674 18
MAP^: F = FMSYlower× (SSB2020/MSYBtrigger) 7291 0.082 66230 80610 22
MAP^: F = FMSYupper×(SSB2020/MSYBtrigger) 12393 0.144 65786 75602 15
F = FMSY 24535 0.31 64618 64275 -1
F = Fpa 27179 0.35 64340 61819 -4
F = Flim 33356 0.45 63650 56155 -12
SSB (2022) = Blim ^^
SSB (2022) = Bpa ^^
SSB (2022) = MSYBtrigger ^^
F = F2020 14410 0.17 65603 73849 13
Catch for bycatch fleets only ^^^ 3308 0.026 6574 85251 28




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 (2022) relative to SSB (2021).
*** The advised catch in 2020 was 0 tonnes.
^ As SSB2020 is below MSY Btrigger, the FMSY, FMSY lower, and FMSY upper values in the MAP are adjusted by the SSB2020/MSY Btrigger ratio.
^^ The Blim and Bpa cannot be achieved in 2022, even with zero catch advice.
^^^ Only the A-fleet that targets North Sea autumn-spawning (NSAS) herring and the D-fleet that targets sprat are allowed to fish, assuming the same catch as in the intermediate year 2020 (C- and F-fleets have zero catch).