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
2017
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
8740
Link to Advice Sheet
https://doi.org/10.17895/ices.pub.3152






Catch scenarios


Basis
Total catch
Landings*
Discards*
Ftotal
Flandings
Fdiscards
SSB
% SSB change*
% advice change**
2018 2018 2018 2018 2018 2018 2019 2019 2019
(t) (t) (t) (ratio) (ratio) (ratio) (t) (%) (%)
ICES Basis Advice
MSY approach: FMSY (F2017 × 0.56) 1399 1139 260 0.19 0.126 0.064 8078 5 17
Other scenarios
F = 0 0 0 0 0 0 0 9687 26 -100
Fpa 2701 2186 515 0.41 0.272 0.139 6589 -14 126
Flim 3474 2800 674 0.57 0.377 0.193 5710 -26 190
SSB (2019) = Blim 5585 4490 1096 0.963 0.638 0.325 3300 -57 367
SSB (2019) = Bpa 4448 3576 873 0.767 0.508 0.259 4600 -40 272
SSB (2019) = MSYBtrigger 4448 3576 873 0.767 0.508 0.259 4600 -40 272
F = F2017 2305 1869 436 0.338 0.224 0.114 7040 -8 93
F multiplier for FMSY of L. whiffiagonis (F2017× 0.54)^ 1365 1111 254 0.185 0.122 0.062 8117 6 14




Symbol Footnotes
* SSB 2019 relative to SSB 2018.
** Total catch 2018 relative to advised catch for 2017 (1197 t).
^ This catch option applies the same multiplicative factor to the current fishing mortality (F2017) for both megrim species (L.whiffiagonis and L.boscii). This year the L.whiffiagonis multiplier is used.