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
2018
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
10258
Link to Advice Sheet
https://doi.org/10.17895/ices.pub.4618






Catch scenarios


Basis
Total catch
Wanted catch*
Unwanted catch*
IBC**
HC ** catch
Ftotal
Fwanted
Funwanted
FIBC
SSB
% SSB change***
% TAC change^
% Advice change^^
2019 2019 2019 2019 2019 2019 2019 2019 2019 2020 2020 2020 2020
(t) (t) (t) (t) (t) (ratio) (ratio) (ratio) (ratio) (t) (%) (%) (%)
ICES Basis Advice
MSY approach: FMSY 33956 31120 2799 38 33918 0.194 0.165 0.029 0.0002 202799 -11.1 -31 -31
Other scenarios
F = MAP^^^ FMSYlower 29532 27069 2425 38 29494 0.167 0.142 0.025 0.0002 207715 -9 -40 -40
F = MAP FMSY upper# 33956 31120 2799 38 33918 0.194 0.165 0.029 0.0002 202799 -11.1 -31 -31
F = 0## 41 0 0 41 0 0 0 0 0.0002 240935 5.6 -100 -100
Fpa 46493 42579 3877 36 46456 0.274 0.23 0.041 0.0002 188923 -17.2 -5.2 -5.1
Flim 62334 57013 5286 35 62299 0.384 0.33 0.058 0.0002 171531 -25 27 27
SSB (2020) =Blim 122118 110341 11751 26 122091 1.02 0.86 0.153 0.0002 94000 -59 151 149
SSB (2020) =Bpa =MSY Btrigger 97084 88381 8672 30 97054 0.68 0.58 0.103 0.0002 132000 -42 98 98
F2018 39199 35916 3246 37 39162 0.23 0.193 0.034 0.0002 196985 -13.7 -20 -20
Rollover TAC 49026 44891 4099 36 48990 0.29 0.25 0.044 0.0002 186130 -18.4 0 0.074
A: Max. 78136 0.522 149569 -34 59 59
B: Min. 21849 0.124 211384 -7 -55 -55
C: COD 21923 0.124 211301 -7 -55 -55
D: SQ effort 39100 0.232 192158 -16 -20 -20
E: Value 39073 0.232 192187 -16 -20 -20
F: range 34046 0.193 203667 -11 -31 -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, based on discard rate estimates for 2015–2017. Unwanted catch includes discards and below minimum size (BMS) landings.
** IBC = Industrial bycatch, HC = Human Consumption.
*** SSB 2020 relative to SSB 2019.
# For this stock, FMSY upper = FMSY.
^ Human Consumption catch in 2019 relative to TAC in 2018: Subdivision 20 (2 569 t) + Subarea 4 (41 767 t) + Division 6.a (4 654 t) = 48 990 t.
^^ Total catch 2019 relative to advice value 2018 (48 990 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-NS: Each fleet stops fishing when its individual cod share is exhausted.
D. SQ (status quo) effort scenario: The effort of each fleet in 2018 and 2019 is as in 2017.
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: 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, whg.27.47d).