Advice and Scenarios Database



Whiting (Merlangius merlangus) in divisions 7.b-c and 7.e-k (southern Celtic Seas and eastern English Channel)
StockCode
whg.27.7b-ce-k
Assessment Year
2018
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
9929
Link to Advice Sheet
https://doi.org/10.17895/ices.pub.4487






Catch scenarios


Basis
Total catch
Wanted catch*
Unwanted catch*
Ftotal
Fwanted
Funwanted
SSB
SSB change **
Advice change ***
2019 2019 2019 2019 2019 2019 2020 2020 2020
(t) (t) (t) (ratio) (ratio) (ratio) (t) (%) (%)
ICES Basis Advice
MSY approach: FMSY 15841 9882 5960 0.52 0.34 0.18 44943 5 -18.5
Other scenarios
FMSYlower 10468 6602 3866 0.32 0.21 0.11 49610 15.9 -46
FMSYupper 19395 12002 7393 0.67 0.44 0.23 41904 -2 -0.175
F = 0 0 0 0 0 0 0 58900 38 -100
F = Fpa 22190 13639 8552 0.8 0.53 0.27 39543 -8 14.2
F = Flim 28128 17013 11115 1.12 0.74 0.38 34628 -19.1 45
SSB2020= Blim 40437 23447 16990 2.08 1.37 0.71 25000 -42 108
SSB2020= Bpa= Btrigger 27672 16760 10912 1.09 0.72 0.37 35000 -18.3 42
F = F2018 16320 10169 6150 0.54 0.36 0.18 44532 4 -16
Mixed fisheries options
A: Max. 16089 0.53 44731 4
B: Min. 0 0 58900 38
C: Stock 15841 0.52 44943 5
D: SQ effort 17679 0.59 43367 1.28
E: Value 11995 0.37 48336 4
F: Range 10668 0.33 49434 15.4




Symbol Footnotes
* “Wanted” and “unwanted” catch are used to describe fish that would be landed and discarded, respectively, in the absence of the EU landing obligation.
** SSB 2020 relative to SSB 2019.
*** Advice value for 2019 relative to advice value for 2018 (19 429 tonnes).
A Mximum scenrio: Ech fleet stops fishing when its lst stock shre is exhusted.
B Minimum scenario: Each fleet stops fishing when its first stock share is exhausted.
C Stok senario: Eah fleet stops fishing when its individual stok share is exhausted.
D SQ (status quo) effort scenario: The effort of each fleet in 2018 an 2019 is the same as in 2017.
E Valu scnario: Th ffort of ach flt is qual to th wightd avrag of th fforts rquird to catch th flt’s quota shar of ach of th stocks, whr th wights ar th rlativ catch valus (pric × wight) of ach stock in th flt’s portfolio.
F Range scenario: The potential or TAC mismatch in 2019 is minimized within the MSY range, or the demersal ish stocks or which such a range is available (cod in divisions 7.e–k, haddock in divisions 7.b–k, and whiting in divisions7.b–c and 7.e–k).