Advice and Scenarios Database



Herring (Clupea harengus) in subdivisions 30 and 31 (Gulf of Bothnia)
StockCode
her.27.3031
Assessment Year
2024
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
19122






Catch scenarios


Basis
Total catch (2025)
F (2025)
SSB (2026)
% SSB change*
% TAC change**
% advice change***
Probability SSB <; Blim in 2026 (%)^
2025 2025 2026 2026 2025 2025 2026
(t) (ratio) (t) (%) (%) (%) (%)
ICES Basis Advice
EU MAP^^: FMSY × SSB(2025)/MSY Btrigger 74515 0.19 532003 -0.3 36 18 4.8
EU MAP^^: MAP range Flower × SSB(2025)/MSYBtrigger 66446 0.168 539660 1.2 21 36 4.1
Other scenarios
F = 0 0 0 602872 13 -100 -100 1
FMSY 84586 0.218 522454 -2.1 54 34 6.1
Flower 75605 0.193 530970 -0.5 38 20 4.9
Fpa = FMSY upper 84586 0.218 522454 -2.1 54 34 6.1
Fupper x SSB (2025)/MSYBtrigger 74515 0.19 532003 -0.3 36 18 4.8
SSB (2026)=Blim 225320 0.69 389921 -27 310 257 50
SSB (2026)= Bpa 90593 0.235 516760 -3.1 65 44 6.9
SSB (2026)= MSYBtrigger##
SSB (2026)= SSB (2025) 73058 0.186 533385 0 33 16 4.7
F=F2024 56654 0.142 548957 2.9 3 -10 3.4
P(SSB (2026) <; Blim) = 5 % 75605 0.193 530970 -0.5 38 20 5




Symbol Footnotes
* SSB 2026 relative to SSB 2025.
** Catch in 2025 relative to the TAC in 2024 (55 000 tonnes).
*** Advice values for 2025 relative to the corresponding 2024 values (EU MAP advice of 63 049 [FMSY] and 48 824 [Flower] tonnes, respectively; other values are relative to 63 049 tonnes).
# Based on stochastic forecasts, using the F with three decimals to get close to the biomass target.
## The MSYBtrigger option was left blank because MSYBtrigger cannot be achieved in 2026, even with zero catch in 2025.
^ The probability of SSB being below Blim in 2026. This probability relates to the short-term probability of SSB <; Blim and is not comparable to the long-term probability of SSB <; Blim tested in simulations when estimating fishing mortality reference points.
^^ MAP multiannual plan (EU, 2016, 2019, 2020).
~ Advice values for 2025 relative to the 2024 value corresponding to FMSY upper.