Advice and Scenarios Database



Turbot (Scophthalmus maximus) in Subarea 4 (North Sea)
StockCode
tur.27.4
Assessment Year
2020
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
13708
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.5914






Catch scenarios


Basis
Total catch*
Projected landings**
Projected discards***
F (projected landings. ages 2–6)
SSB (2022)
% SSB change ^
% advice change ^^
2021 2021 2021 2021 2022 2022 2022
(t) (t) (t) (ratio) (t) (%) (%)
ICES Basis Advice
MSY approach: FMSY 3948 3514 435 0.36 9449 3.1 -13
Other scenarios
FMSY upper 4984 4435 549 0.48 8449 -7.8 9.8
FMSY lower 2887 2569 318 0.25 10484 14.4 -36
F = 0 0 0 0 0 13337 46 -100
Fpa 4902 4363 540 0.47 8528 -6.9 8
Flim 5980 5322 658 0.61 7498 -18.2 32
Fsq 3985 3547 439 0.36 9414 2.8 -12.2
SSB (2022) = Blim 10948 9742 1205 1.69 2974 -68 141
SSB (2022) = Bpa 9587 8531 1055 1.28 4163 -55 111
SSB (2022) = MSY Btrigger 7194 6402 792 0.79 6353 -31 59
Rollover advice 4537 4038 499 0.43 8879 -3.1 0




Symbol Footnotes
* (Projected landings) / (1 – average discard rate); average discard rate by weight 2017–2019 = 11.0%.
** Marketable landings.
*** Including BMS landings. assuming average discard rate by weight 2017–2019 = 11.0%.
^ SSB 2022 relative to SSB 2021.
^^ Total catch in 2021 relative to the advice value for 2020 (4538 tonnes).