Advice and Scenarios Database



Plaice (Pleuronectes platessa) in Subarea 4 (North Sea) and Subdivision 20 (Skagerrak)
StockCode
ple.27.420
Assessment Year
2017
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
9250
Link to Advice Sheet
https://doi.org/10.17895/ices.pub.3529






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***
2018 2018 2018 2018 2018 2018 2019 2019 2019
(t) (t) (t) (ratio) (ratio) (ratio) (t) (%) (%)
ICES Basis Advice
MSY approach: FMSY 142481 96266 46215 0.21 0.1 0.19 1005667 3 -35
Other scenarios
Management Plan (MP) 196653 133233 63420 0.3 0.15 0.27 952027 -3 -10
F = 0 0 0 0 0 0 0 1149133 17 -100
Fpa 235496 159884 75612 0.37 0.18 0.33 913710 -7 8
Flim 311202 212217 98985 0.52 0.25 0.46 839408 -14 44
SSB (2019) = Blim 1003350 746845 256505 4.79 2.33 4.3 207288 -79 404
SSB (2019) = Bpa 902729 657496 245233 3.29 1.6 2.95 290203 -70 343
SSB (2019) = MSYBtrigger 597365 416579 180786 1.31 0.64 1.17 564599 -42 181
Rollover TAC 217551 147556 69995 0.34 0.16 0.3 931396 -5 0
F = F2017 137462 92852 44610 0.2 0.1 0.18 1010647 3 -37
A: Max. 341557 0.65 745833 -25
B: Min. 106733 0.17 978476 -2
C: HAD 135962 0.21 978944 -2
D: POK 185735 0.36 794999 -20
E: SQ effort 164199 0.28 890225 -11
F: Value 146365 0.24 938847 -6
G: Range 140112 0.22 969778 1




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 2014–2016. 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 2018. The subtracted value (946 t of wanted catch and 459 t of unwanted catch) is estimated based on the plaice catch advice for Division 7.d for 2017, using the recent 11-year average (2006–2016) proportion of plaice from Subarea 4 in the annual plaice landings in Division 7.d.
** SSB 2019 relative to SSB 2018.
*** Wanted catch in 2018 relative to the combined TAC of Subarea 4 and Subdivision 20 in 2017 (147 556 t), ignoring that large mesh trawlers (TR1 and BT1) are under landing obligation since 2016.
A. Maximum scenario: Each fleet stops fishing when its last stock share is exhausted.
B. Minimum scenario: Each fleet stops fishing when its first stock share is exhausted.
C. HAD: Each fleet stops fishing when its individual haddock share is exhausted.
D. POK: Each fleet stops fishing when its individual saithe share is exhauste
E. SQ (status quo) effort scenario: The effort of each fleet in 2017 and 2018 is as in 2016.
F. Value scenario: The effort of each fleet is equal to the weighted average of the efforts required to catch the fleet’s quota share of each of the stocks, where the weights are the relative catch values of each stock in the fleet’s portfolio.
G. Range scenario: where the potential for TAC mismatches in 2018 are minimized within the FMSY range, for the demersal fish stocks for which such a range is available (cod.27.47d20; had.27.46a20; pok.27.3a46; ple.27.420; ple.27.7d; sol.27.4; sol.27.7d).