Advice and Scenarios Database



Herring (Clupea harengus) in subdivisions 30 and 31 (Gulf of Bothnia)
StockCode
her.27.3031
Assessment Year
2021
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
14149
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.7769






Catch scenarios


Basis
Total catch
F
SSB*
SSB
% SSB change**
% Advice change***
2022 2022 2022 2023 2023 2023
(t) (ratio) (t) (t) (%) (%)
ICES Basis Advice
EU MAP^^^: FMSY 111345 0.271 598969 579522 -3.2 -5.2
EU MAP^^^: Flower^ 86729 0.206 599117 608030 1.5 -5.2
EU MAP^^^: Fupper^^ 111714 0.272 600221 581962 -3 -5.2
Other scenarios
FMSY 111345 0.271 598969 579522 -3.2 -5.2
F=0 0 0 605437 688221 14 -100
F=Fpa 111714 0.272 600221 581962 -3 -4.9
F=Flim 187695 0.496 600820 505496 -16 60
SSB (2023)=Blim# 331309 1.06 601324 368407 -39 182
SSB (2023)= Bpa# 171191 0.44 602045 523586 -13 46
SSB (2023)= MSYBtrigger# 171191 0.44 602045 523586 -13 46
SSB (2023)= SSB (2022)# 90018 0.21 599960 601967 0.33 -23
F=F2021 111345 0.27 598969 579522 -3.2 -5.2




Symbol Footnotes
* Based on stochastic calculations.
** SSB 2023 relative to SSB 2022.
*** Advice value in 2022 relative to advice value for EU MAP: FMSY 2021 (117 485 tonnes, updated in May 2021).
# Based on stochastic forecasts, using the F with three decimals getting the closest to the biomass target. SSB (2023) = Blim: -2.2%; SSB (2023) = Bpa = MSY Btrigger: -1.9%; SSB (2023) = SSB (2022): 0.33%, (in SSB 2023 column)
^ Advice value for 2022 relative to advice value for EU MAP: Flower 2021 (91 494 tonnes, updated in May 2021), (in % Advice change *** column)
^^ Advice value for 2022 relative to advice value for EU MAP: Fupper 2021 (117 875 tonnes, updated in May 2021), (in % Advice change *** column)
^^^ MAP multiannual plan (EU, 2016).