Advice and Scenarios Database



Saithe (Pollachius virens) in subareas 4, 6 and Division 3.a (North Sea, Rockall and West of Scotland, Skagerrak and Kattegat)
StockCode
pok.27.3a46
Assessment Year
2018
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
10324
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.4898






Catch scenarios


Basis
Total catch
Wanted catch*
Unwanted catch*
Wanted catch*# 3a4
Wanted catch*#6
Ftotal
Fwanted
Funwanted
SSB
% SSB change**
% TAC change***
% advice change^
2019 2019 2019 2019 2019 2019 2019 2019 2020 2020 2020 2020
(t) (t) (t) (t) (t) (ratio) (ratio) (ratio) (t) (%) (%) (%)
ICES Basis Advice
MSY approach: FMSY 103327 96223 7104 87178 9045 0.363 0.34 0.027 245270 -4.7 -10.9 -12.8
Other scenarios
F = MAP^^ FMSY lower 64046 59632 4414 54027 5605 0.21 0.195 0.015 284677 10.6 -45 -46
F = MAP FMSY upper 141887 131412 10475 119059 12353 0.536 0.5 0.04 208801 -18.8 22 19.8
F = 0 0 0 0 0 0 0 0 0 346812 35 -100 -100
Fpa 122436 113660 8776 102976 10684 0.446 0.41 0.033 226656 -11.9 5.5 3.4
Flim 158174 146463 11711 132695 13768 0.62 0.57 0.046 192352 -25 36 34
SSB2020 = Blim = Blim 248039 228794 19245 207287 21507 1.25 1.15 0.092 107297 -58 114 109
SSB2020 = Bpa= Bpa 202910 187756 15154 170107 17649 0.89 0.82 0.066 149098 -42 75 71
SSB2020 = Btrigger = MSYBtrigger 202910 187756 15154 170107 17649 0.89 0.82 0.066 149098 -42 75 71
F = F2018 93610 87187 6423 78991 8196 0.32 0.3 0.024 254838 -0.95 -19.3 -21
TAC2018 116008 107821 8187 97686 10135 0.42 0.39 0.031 232460 -9.6 0 -2.1
A: Max. 174252 0.525 253216 -27 50 47
B: Min. 59895 0.152 367813 6.7 -48 -49
C: COD 61368 0.156 366314 6.3 -47 -48
D: SQ 94802 0.252 332443 -3.5 -18 -20
E: Value effort 110012 0.299 317128 -8 -5.2 -7.1
F: Range 81766 0.212 349517 1.4 -30 -31




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.
** SSB2020 relative to SSB2019.
*** Total catch in 2019 relative to the TAC in 2018 (116 008 t).
# Wanted catch split according to the average in 1993–1998, i.e. 90.6% in Subarea 4 and Subdivision 3.a.20 and 9.4% in Subarea 6.
^ Total catch 2019 relative to the advice value 2018 (118 460 t).
^^ Proposed EU multiannual plan (MAP) for the North Sea (EU, 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. COD: Each fleet stops fishing when its individual cod share is exhausted.
D. SQ (status quo) effort scenario: The effort of each fleet in 2017 and 2018 is as in 2016.
E. 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.
F. Range scenario: 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).