Advice and Scenarios Database



Four-spot megrim (Lepidorhombus boscii) in divisions 8.c and 9.a (southern Bay of Biscay and Atlantic Iberian waters East)
StockCode
ldb.27.8c9a
Assessment Year
2020
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
13594
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.5859






Catch scenarios


Basis
Total catch
Projected landings
Projected discards
Ftotal
F projected landings
F projected discards
SSB
% SSB change*
% advice change**
2021 2021 2021 2021 2021 2021 2022 2022 2022
(t) (t) (t) (ratio) (ratio) (ratio) (t) (%) (%)
ICES Basis Advice
EU MAP ^: FMSY 1690 1471 218 0.193 0.115 0.078 7955 -1.08 -10.4
F = MAP FMSY lower 1148 1003 145 0.125 0.075 0.05 8581 6.7 -9.9
F = MAP FMSY upper 2375 2059 316 0.29 0.173 0.117 7167 -10.9 -10.4
Other scenarios
MSY approach = FMSY 1690 1471 218 0.193 0.115 0.078 7955 -1.08 -10.4
F = 0 0 0 0 0 0 0 9908 23 -100
Fpa 3260 2821 439 0.41 0.25 0.165 6145 -24 73
Flim 4532 3922 610 0.57 0.34 0.23 4676 -42 140
SSB (2022) = Blim 5725 4954 771 0.72 0.43 0.29 3300 -59 204
SSB (2022) = Bpa 4599 3979 619 0.58 0.35 0.23 4600 -43 144
SSB (2022)= MSYBtrigger 4599 3979 619 0.58 0.35 0.23 4600 -43 144
F = F2020 1486 1296 190 0.167 0.1 0.067 8190 1.84 -21
F multiplier for FMSY of L.whiffiagonis = F2020× 0.846 # 1281 1119 163 0.141 0.084 0.057 8427 4.8 -32




Symbol Footnotes
* SSB 2022 relative to SSB 2021.
** Advice values for 2021 relative to the corresponding 2020 values (MAP advice of 1885, 1275, and 2651 tonnes, respectively; other values are relative to FMSY).
# This catch scenario applies the same multiplicative factor to the current fishing mortality (F2019) for both megrim species (L. whiffiagonis and L. boscii). This year the L. whiffiagonis multiplier is used.
^ The EU multiannual plan (MAP; EU, 2019).