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
2018
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
9353
Link to Advice Sheet
https://doi.org/10.17895/ices.pub.4387






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 2019
SSB 2020 **
%SSB change ***
A-fleet **** %TAC change
% Advice change ^
2019 2019 2019 2019 2019 2019 2019 2019 2019 2019 2019 2019 2020 2020 2020 2020
(ratio) (ratio) (ratio) (ratio) (ratio) (ratio) (t) (t) (t) (t) (t) (t) (t) (%) (%) (%)
ICES Basis Advice
MSY approach 0.22 0.049 0 0 0.216 0.05 291040 20532 0 0 311572 1162495 1156221 -17.2 -51.5 -39.8
Other scenarios
EU–Norway Management strategy 0.195 0.049 0 0 0.195 0.05 266494 20532 0 0 287026 1178944 1185543 -16 -55.6 -44.6
F = FMSY 0.259 0.049 0 0 0.26 0.05 341513 20532 0 0 362045 1128363 1097826 -19.6 -43.1 -30.1
F = 0 0 0 0 0 0 0 0 0 0 0 0 1351984 1556967 -3.7 -100 -100
No change in A-fleet TAC 0.53 0.049 0 0 0.531 0.052 600588 20532 0 0 621120 946334 835271 -32.6 0 19.9
A-fleet TAC reduction of 15% 0.43 0.049 0 0 0.427 0.051 510500 20532 0 0 531032 1010956 919895 -28 -15 2.5
A-fleet TAC increase of 15% 0.65 0.049 0 0 0.649 0.052 690676 20532 0 0 711208 880268 757094 -37.3 15 37.3
F = F2018 0.38 0.049 0 0 0.381 0.051 467438 20532 0 0 487971 1041340 962774 -25.8 -22.2 -5.8
Fpa 0.3 0.049 0 0 0.3 0.051 385008 20532 0 0 405540 1098610 1049500 -21.7 -35.9 -21.7
Flim 0.34 0.049 0 0 0.34 0.051 426477 20532 0 0 447010 1069944 1005090 -23.8 -29 -13.7
SSB2019 = Bpa 0.61 0.049 0 0 0.613 0.052 663976 20532 0 0 684508 900000 779623 -35.9 10.6 32.2
SSB2019 = Blim 0.81 0.049 0 0 0.81 0.053 797571 20532 0 0 818104 800000 671967 -43 32.8 58
SSB2019 = MSYBtrigger^^^




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 option in 2020 as in 2019.
*** SSB (2019) relative to SSB (2018).
**** A-fleet catches (2019) relative to TAC 2018 for the A-fleet (600 588 tonnes).
# The catch for C and D fleets are set to zero because of the zero catch advice given for 2019 for the Western Baltic spring-spawning herring stock.
^ Advice value 2019 relative to advice value 2018, using catches for all fleets.
^^ Following the MSY advise rule FMSY × SSB2019/MSY Btrigger (ICES, 2016).
^^^ MSY Btrigger cannot be reached in 2019.