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
2019
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
10365
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.4716






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 ^
2020 2020 2020 2020 2020 2020 2020 2020 2020 2020 2020 2020 2021 2021 2021 2021
(ratio) (ratio) (ratio) (ratio) (ratio) (ratio) (t) (t) (t) (t) (t) (t) (t) (%) (%) (%)
ICES Basis Advice
MSY approach 0.24 0.046 0 0 0.24 0.048 418649 12413 0 0 431062 1286788 1167712 -15.8 8.7 38.4
Other scenarios
F = FMSY 0.26 0.046 0 0 0.26 0.048 448772 12412 0 0 461185 1266292 1135230 -17.2 16.6 48
F = 0 0 0 0 0 0 0 0 0 0 0 0 1558516 1699799 1.9 -100 -100
No change in A-fleet TAC 0.22 0.046 0 0 0.22 0.047 385008 12414 0 0 397422 1309518 1204811 -14.3 0 27.6
A-fleet TAC reduction of 15% 0.179 0.046 0 0 0.179 0.047 327257 12415 0 0 339672 1348146 1270564 -11.8 -15 9
A-fleet TAC increase of 15% 0.26 0.046 0 0 0.26 0.048 442759 12412 0 0 455172 1270395 1141659 -16.9 15 46.1
F = F2019 0.194 0.046 0 0 0.194 0.047 351394 12415 0 0 363809 1332061 1242761 -12.9 -8.7 16.8
Fpa 0.3 0.046 0 0 0.3 0.048 503560 12411 0 0 515971 1228661 1077894 -19.6 30.8 65.6
Flim 0.34 0.046 0 0 0.34 0.048 555312 12409 0 0 567721 1192695 1025745 -22 44.2 82.2
SSB2020 = Bpa 0.75 0.046 0 0 0.75 0.05 957157 12395 0 0 969552 899590 679381 -41.2 148.6 211.2
SSB2020 = Blim 0.95 0.046 0 0 0.95 0.051 1087848 12388 0 0 1100237 799618 585305 -47.7 182.6 253.1
SSB2020 = MSYBtrigger 0.131 0.046 0 0 0.132 0.047 249400 12417 0 0 261817 1399457 1363458 -8.5 -35.2 -16
MSY approach with C- and D-fleets catches and C-fleet TAC transfer## 0.25 0.046 0.002 0.002 0.25 0.052 429474 12392 2886 604 445357 1286867 1165739 -15.8 11.5 42.9




Symbol Footnotes
# The catch for C- and D-fleets are set to zero because of the zero catch advice given for 2020 for the western Baltic spring-spawning herring stock.
## Following the MSY advice rule FMSY × SSB2020/MSY Btrigger (ICES, 2016), assuming same catches as in 2019 for the C- and D-fleet and a 48% C-fleet TAC transfer to the A-fleet.
### Following the MSY advice rule FMSY × SSB2020/MSY Btrigger (ICES, 2016), assuming same catches as in 2019 for the C- and D-fleet and no C-fleet TAC transfer to the A-fleet.
* 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 2020 as in 2019.
*** SSB (2020) relative to SSB (2019).
**** A-fleet catches (2020) relative to TAC 2019 for the A-fleet (385 008 tonnes).
^ Advice value 2020 relative to advice value 2019, using catches for all fleets.
^^ Following the MSY advice rule FMSY × SSB2020/MSY Btrigger (ICES, 2016).
^^^ Status quo fishing mortality for the B-fleet for all catch options.