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
2017
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
9001
Link to Advice Sheet
https://doi.org/10.17895/ices.pub.3206






Catch scenarios


Basis
Total catch
Wanted catch*
Unwanted catch*
Wanted catch* 3a4
Wanted catch*6
Ftotal
Fwanted
Funwanted
SSB
% SSB change**
% TAC change***
2018 2018 2018 2018 2018 2018 2018 2018 2019 2019 2019
(t) (t) (t) (t) (t) (ratio) (ratio) (ratio) (t) (%) (%)
ICES Basis Advice
MSY approach: FMSY 118460 103731 14729 93980 9751 0.36 0.32 0.04 279689 2.8 -2.4
Other scenarios
F = 0 0 0 0 0 0 0 0 0 394153 45 -100
Fpa 130786 114463 16323 103704 10759 0.4 0.36 0.045 267945 -1.5 7.6
Flim 171024 149404 21620 135360 14044 0.56 0.5 0.063 229853 -15.5 41
SSB (2019) = Blim 310073 267552 42521 242402 25150 1.4 1.25 0.157 107000 -61 152
SSB (2019) = Bpa 259758 225247 34511 204073 21174 1.03 0.91 0.115 150000 -45 112
SSB (2019) = MSYBtrigger 259758 225247 34511 204073 21174 1.03 0.91 0.115 150000 -45 112
F = F2017 124816 109286 15530 99013 10273 0.38 0.34 0.043 273559 0.55 2.8
TAC2017 121516 106331 15185 96336 9995 0.37 0.33 0.041 276208 1.52 0
F = FMSY lower 75093 65865 9228 59673 6192 0.21 0.189 0.024 321353 18.1 -38
F = FMSY upper with AR 153765 134418 19347 121783 12635 0.49 0.44 0.055 246136 -9.5 26
A: Max. 188427 0.61 226078 -17
B: Min. 66271 0.18 341644 26
C: HAD 79769 0.2 362988 33
D: POK 114358 0.36 267781 -2
E: SQ effort 99571 0.27 316163 16
F: Value 100212 0.28 309074 14
G: Range 77317 0.22 319205 17




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 discard rate estimates for 2016.
** SSB 2019 relative to SSB 2018.
*** Wanted catch in 2018 relative to TAC, minus top-up for fleets under landing obligation in 2017 (106 331 t).
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).