Advice and Scenarios Database



Plaice (Pleuronectes platessa) in Subarea 4 (North Sea) and Subdivision 20 (Skagerrak)
StockCode
ple.27.420
Assessment Year
2019
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
13217
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.5644






Catch scenarios


Basis
Total catch
Wanted catch*
Unwanted catch*
^^ Ftotal ages 2–6
Fwanted ages 2–6
Funwanted ages 2–3
SSB
% SSB change**
% TAC change***
% Advice change ^
2020 2020 2020 2020 2020 2020 2021 2021 2021 2021
(t) (t) (t) (ratio) (ratio) (ratio) (t) (%) (%) (%)
ICES Basis Advice
MSY approach: FMSY 166499 89216 77283 0.21 0.091 0.21 1237188 4.4 17.1 17.1
Other scenarios
F = MAP FMSY upper 229528 123550 105978 0.3 0.13 0.29 1180054 -0.4 61 61
F = MAP FMSY lower 118554 63323 55231 0.146 0.063 0.143 1280808 8.1 -16.6 -16.6
F = 0 0 0 0 0 0 0 1390696 17.4 -100 -100
Fpa 274634 148348 126286 0.37 0.159 0.36 1139325 -3.8 93 93
Flim 362341 197190 165151 0.52 0.22 0.51 1060536 -10.5 155 155
SSB (2021) = Blim 1385413 946464 438949 9.3 4 9.1 207288 -83 870 870
SSB (2021) = Bpa 1278745 844386 434359 6.6 2.8 6.4 290203 -76 800 800
SSB (2021) = MSY Btrigger 935796 555440 380356 2.4 1.04 2.4 564599 -52 560 560
Rollover TAC 142217 76072 66145 0.177 0.077 0.174 1259276 6.3 0 0
F2020 = F2019 154026 82462 71564 0.193 0.083 0.189 1248522 5.4 8.3 8.3




Symbol Footnotes
* "Wanted" and "unwanted" catch are used to describe fish that would be landed and discarded in the absence of the EU landing obligation, based on average discard rate estimates for 2016–2018. Both wanted and unwanted catch refer to Subarea 4 and Subdivision 20, calculated as the projected total stock wanted catch (including Division 7.d) deducted by the catch of plaice from Subarea 4 taken in Division 7.d in 2020. The subtracted value (836 t of wanted catch and 779 t of unwanted catch) is estimated based on the plaice catch advice for Division 7.d for 2020.
** SSB 2021 relative to SSB 2020.
*** Total catch in 2020 relative to the combined TAC of Subarea 4 and Subdivision 20 in 2019 (142 217 t).
^ Total catch in 2020 relative to advice value 2019 (142 217 t).
^^ Fwanted and Funwanted do not sum up to the Ftotal as they are calculated using different ages.