Advice and Scenarios Database



Megrim (Lepidorhombus spp.) in divisions 4.a and 6.a (northern North Sea, West of Scotland)
StockCode
lez.27.4a6a
Assessment Year
2019
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
12855
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.4786






Catch scenarios


Basis
Total catch
Wanted catch*
Unwanted catch*
Fishing mortality F2020/FMSY
Stock size B2021/BMSY
% B change**
% TAC change^
% Advice change^^
2020 2020 2020 2020 2021 2021 2021 2021
(t) (t) (t) (ratio) (t) (%) (%) (%)
ICES Basis Advice
EU MAP ^^^: FMSY† 8350 7684 666 1 1.42 -15 -4 1
F = MAP FMSY lower 6450 5935 515 0.77 1.52 -10 -26 -22
F= MAP FMSYupper† 8350 7684 666 1 1.42 -15 -4 1
Other scenarios
F= 0 0 0 0 0 1.83 9 -100 -100
B2021= Blim 31550 29033 2517 3.77 0.35 -79 264 282
B2021= Bpa = MSYBtrigger 16700 15368 1332 1.99 1.01 -40 92.6 102.4
F= F2019 3258 2998 260 0.4 1.68 0 -62 -61




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 (for Division 6.a only), based on discard rate estimates for 2015–2018.
** Biomass 2021 relative to biomass 2020.
† in % TAC change^ column
^ Total catch in 2020 relative to TAC in 2019 (8669 tonnes, which corresponds to the 2019 TAC for subareas 4 and 6).
^^ Advice value for 2020 relative to the advice value for 2019 (8250 tonnes).
^^^ EU multiannual plan (MAP) for the Western Waters (EU, 2019).