Advice and Scenarios Database



Herring (Clupea harengus) in Division 5.a, summer-spawning herring (Iceland grounds)
StockCode
her.27.5a
Assessment Year
2017
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
8889
Link to Advice Sheet
https://doi.org/10.17895/ices.pub.3131






Catch scenarios


Basis
Total catch
HR*
F total
Biomass of age 4+
SSB
% SSB change**
% TAC change***
2017/2018 2017/2018 2017/2018 2018 2018 2018 2018
(t) (ratio) (ratio) (t) (t) (%) (%)
ICES Basis Advice
HCR 5 § 38712 0.15 0.18 253517 247570 3 -39
Other scenarios
HCR 2 §§ 30807 0.119 0.14 260600 254232 6 -51
HCR 3 §§§ 29395 0.114 0.13 261865 255422 6 -53
HCR 4 ^ 38712 0.15 0.18 253517 247570 3 -39
FMSY × SSB2017/MSYBtrigger (= HCR 1 ^^) 40800 0.158 0.19 251646 245811 2 -35
F = 0 0 0 0 288186 280195 16 -100




Symbol Footnotes
§ HCR 5: Because SSB2017 without infection mortality (256 000 t) is above MGT Btrigger (200 000 t), the HR is HRMGT = 0.15.
§§ HCR 2: Because SSB2017 without infection mortality (256 000 t) is below MGT Btrigger (273 000 t), and Ichthyophonus outbreak is observed in 2017, the HR is HRMGT × (SSB2017/MGT Btrigger) × 0.67 = 0.19 × (256/273) × 0.67 = 0.119.
§§§ HCR 3: Because SSB2017 without infection mortality (256 000 t) is above MGT Btrigger (200 000 t), and Ichthyophonus outbreak is observed in 2017, the HR is HRMGT × 0.67 = 0.17 × 0.67 = 0.114.
* Catch in 2017/2018 divided by B(age 4+) in 2017.
** SSB 2018 relative to SSB 2017 (240 578 t, accounting for infection mortality).
*** Catch in 2017/2018 relative to TAC in 2016/2017 (63 000 t).
^ HCR 4: Because SSB2017 without infection mortality (256 000 t) is above MGT Btrigger (150 000 t), the HR is HRMGT = 0.15.
^^ HCR 1: Because SSB2017 with infection mortality (240 578 t) is below MGT Btrigger (273 000 t), the F is FMGT × (SSB2017/MGT Btrigger) = 0.22 × (240578/273000) = 0.19. Note: for HCR 1, FMGT = FMSY and MGT Btrigger = MSY Btrigger.