Advice and Scenarios Database



Haddock (Melanogrammus aeglefinus) in Subarea 4, Division 6.a, and Subdivision 20 (North Sea, West of Scotland, Skagerrak)
StockCode
had.27.46a20
Assessment Year
2017
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
9256
Link to Advice Sheet
NA - The advice link for key 9256 was not found!






Catch scenarios


Basis
Total catch
Wanted catch*
Unwanted catch*
IBC**
Ftotal
Fwanted
Funwanted
FIBC
SSB
% SSB change***
% TAC change^, ^^
2018 2018 2018 2018 2018 2018 2018 2018 2019 2019 2019
(t) (t) (t) (t) (ratio) (ratio) (ratio) (ratio) (t) (%) (%)
ICES Basis Advice
MSY approach: FMSY 48990 43437 5552 0 0.194 0.166 0.028 0 266941 16 10
Other scenarios
F = 0 0 0 0 0 0 0 0 0 315692 37 -100
Fpa 67145 59464 7681 0 0.27 0.24 0.039 0 249102 8 51
Flim 90158 79704 10454 0 0.38 0.33 0.054 0 226609 -1 102
SSB (2019) = Blim 192923 166695 26228 0 1.26 1.08 0.179 0 94000 -43 323
SSB (2019) = Bpa 175109 152807 22302 0 0.98 0.84 0.138 0 132000 -36 288
SSB (2019) = MSY Btrigger 175109 152807 22302 0 0.98 0.84 0.138 0 132000 -36 288
F = F2017^^ 46353 41106 5247 0 0.183 0.157 0.026 0 269537 17 4.3
A: Max. 220293 1.27 106861 -54
B: Min. 41436 0.16 266155 16
C: HAD 50284 0.19 267716 16
D: POK 75234 0.34 208920 -9
E: SQ effort 64286 0.27 238305 4
F: Value 54641 0.22 253692 10
G: Range 50056 0.19 267865 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 2014–2016. Unwanted catch includes discards and below minimum size (BMS) landings.
** Industrial bycatch (IBC) is based on the average proportion of the total catch for 2014–2016. Values are small, but not zero.
*** SSB 2019 relative to SSB 2018.
^ Wanted catch in 2018 relative to TAC in 2017: Subdivision 20 (2069 t) + Subarea 4 (33 643 t) + Division 6.a (3697 t) = 39 409 t.
^^ Version 2: Correct F = F2017 value in F total column only and corresponding % TAC change
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).