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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
2019
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
12893
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.4762
Status:
valid
Advice Component
Advice Category
*
FMSYranges
MP
MSY
NoAdv
Other
PA
Advice Type
*
Catches
Effort
FishMort
Landings
NoAd
NoFish
Advice Unit
*
t
ratio
%
AdviceValue
*
Advice Value Lower Range
Advice Value Upper Range
Wanted Catch
Wanted Catch Lower Range
Wanted Catch Upper Range
Advice Sentence
*
ICES advises that when the EU multiannual plan (MAP) for Western waters and adjacent waters is applied, catches in 2020 that correspond to the F ranges in the MAP are between 1275 tonnes and 2651 tonnes. According to the MAP, catches higher than those corresponding to FMSY (1885 tonnes) can only be taken under conditions specified in the MAP, while the entire range is considered precautionary when applying the ICES advice rule. Management of catches of the two megrim species, L. whiffiagonis and L. boscii, under a combined species TAC prevents effective control of the single-species exploitation rates, and could lead to overexploitation of either species.
Advice Released Date
*
Advice Applicable From
*
Advice Applicable Until
*
TAF Link
Management Alignment
Full
Multiple
Other
Partial
MP WebLink
Management Plan Ownership
Link To Evaluation
Inquiries or Comments?
Email:
Message:
Catch scenarios
Basis
Total catch
Wanted catch
Unwanted catch
Ftotal
Flandings
Fdiscards
SSB
% SSB change*
% Advice change**
2020
2020
2020
2020
2020
2020
2021
2021
2021
(t)
(t)
(t)
(ratio)
(ratio)
(ratio)
(t)
(%)
(%)
ICES Basis Advice
EU MAP^: FMSY
1885
1638
246
0.193
0.11
0.083
8673
-2
15
F = MAP FMSY lower
1275
1112
163
0.125
0.071
0.054
9382
6
-22
F = MAP FMSY upper
2651
2295
356
0.29
0.165
0.125
7783
-12
62
Other scenarios
MSY approach = FMSY
1885
1638
246
0.193
0.11
0.083
8673
-2
15
F = 0
0
0
0
0
0
0
10870
23
-100
Fpa
3645
3150
495
0.41
0.23
0.177
6626
-25
123
Flim
5078
4389
689
0.57
0.32
0.25
4958
-44
210
SSB (2021) = Blim
6477
5597
879
0.73
0.41
0.31
3330
-62
300
SSB (2021) = Bpa
5386
4655
731
0.61
0.34
0.26
4600
-48
230
SSB (2021)= MSYBtrigger
5386
4655
731
0.61
0.34
0.26
4600
-48
230
F = F2019
1648
1435
213
0.166
0.094
0.071
8948
1
1
F multiplier for FMSY of L.whiffiagonis = F2019× 0.996 #
1642
1430
212
0.165
0.094
0.071
8955
1
1
Symbol
Footnotes
*
SSB 2021 relative to SSB 2020.
**
Catch advice value for 2020 relative to catch advice value for 2019 (1633 tonnes).
#
This catch scenario applies the same multiplicative factor to the current fishing mortality (F2018) for both megrim species (L.whiffiagonis and L.boscii). This year the L.whiffiagonis multiplier is used.
^
MAP multiannual plan (EU, 2019).
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