Advice and Scenarios Database



Herring (Clupea harengus) in Subarea 4 and divisions 3.a and 7.d, autumn spawners (North Sea, Skagerrak and Kattegat, eastern English Channel)
StockCode
her.27.3a47d
Assessment Year
2020
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
13422
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.6026






Catch scenarios


Basis
F values by fleet and total A-fleet Fages (wr) 2–6
F values by fleet and total B-fleet Fages (wr) 0–1
F values by fleet and total C-fleet Fages (wr) 1–3
F values by fleet and total D-fleet Fages (wr) 0–1
F values by fleet and total Total Fages (wr) 2–6
F values by fleet and total Total Fages (wr) 0–1
NSAS catches by fleet A-fleet
NSAS catches by fleet B-fleet
NSAS catches by fleet C-fleet#
NSAS catches by fleet D-fleet#
Total stock catch
SSB 2021
SSB 2022**
%SSB change ***
A-fleet **** %TAC change
% Advice change ^
2021 2021 2021 2021 2021 2021 2021 2021 2021 2021 2021 2021 2022 2022 2022 2022
(ratio) (ratio) (ratio) (ratio) (ratio) (ratio) (t) (t) (t) (t) (t) (t) (t) (%) (%) (%)
ICES Basis Advice
MSY approach 0.22 0.02 0 0 0.22 0.0209 359367 6425 0 0 365792 1185977 1180568 -7.91 -6.66 -15.14
Other scenarios
F = FMSY 0.26 0.0236 0 0 0.26 0.0246 412470 7570 0 0 420040 1151509 1124228 -10.58 7.13 -2.56
F = 0 0 0 0 0 0 0 0 0 0 0 0 1410558 1622539 9.53 -100 -100
No change in TAC^^^ 0.24 0.0217 0.0038 0.0008 0.24 0.0273 385008 6965 6661 241 398875 1167202 1144575 -9.36 0 -7.47
F = F2020 0.2 0.018 0 0 0.2 0.0188 328563 5788 0 0 334351 1205822 1214243 -6.37 -14.66 -22.44
Fpa 0.3 0.0272 0 0 0.3 0.0284 462984 8717 0 0 471701 1118429 1072590 -13.15 20.25 9.43
Flim 0.34 0.0309 0 0 0.34 0.0322 510788 9860 0 0 520648 1086870 1025413 -15.6 32.67 20.78
SSB2021 = Bpa 0.62 0.0566 0 0 0.62 0.0591 787754 17831 0 0 805585 900000 781185 -30.11 104.61 86.88
SSB2021 = Blim 0.82 0.0744 0 0 0.82 0.0777 933742 23240 0 0 956982 800000 669586 -37.88 142.53 122.01
SSB2021 = MSYBtrigger 0.01 0.0008 0 0 0.01 0.0009 17454 268 0 0 17722 1400000 1598468 8.71 -95.47 -95.89
MSY approach^^ with F01=0.05 target 0.22 0.0491 0 0 0.22 0.05 359114 15557 0 0 374671 1185986 1178000 -7.91 -6.73 -13.08
MSY approach with C- and D-fleets catches and C-fleet TAC transfer## 0.23 0.0198 0.002 0.001 0.23 0.0233 368119 6346 3330 241 378036 1179238 1166898 -8.43 -4.39 -12.3
MSY approach with C- and D-fleets catches and no C-fleet TAC transfer### 0.22 0.0198 0.004 0.001 0.22 0.0252 355855 6346 6661 241 369103 1186084 1175799 -7.9 -7.57 -14.37




Symbol Footnotes
* For autumn-spawning stocks, the SSB is determined at spawning time and is influenced by fisheries between 1 January and spawning.
** Assuming same catch scenario in 2021 as in 2020.
*** SSB (2021) relative to SSB (2020).
**** A-fleet catches (2021) relative to TAC 2020 for the A-fleet (385 008 tonnes).
# The catch for C- and D-fleets are set to zero because of the zero catch advice given for 2022 for the western Baltic spring-spawning herring stock.
## Following the MSY advice rule FMSY × SSB2021/MSY Btrigger (ICES, 2019), assuming same catches as in 2020 for the C- and D-fleets and a 50% C-fleet TAC transfer to the A-fleet.
### Following the MSY advice rule FMSY × SSB2021/MSY Btrigger (ICES, 2019), assuming same catches as in 2020 for the C- and D-fleets and no C-fleet TAC transfer to the A-fleet.
^ Advice value 2021 relative to advice value 2020, using catches for all fleets (431 062 tonnes).
^^ Following the MSY advice rule FMSY × SSB2021/MSY Btrigger (ICES, 2019).
^^^ Based on the agreed TACs for A-, C-, and D-fleets in 2020, the average proportion in 2017–2019 of NSAS herring in the catch (for A-, C-, and D-fleets), no C-fleet TAC transfer to the A-fleet, and the average uptake in 2017–2019 of the bycatch quota (for B- and D-fleets).