Advice and Scenarios Database



Horse mackerel (Trachurus trachurus) in Division 9.a (Atlantic Iberian waters)
StockCode
hom.27.9a
Assessment Year
2019
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
13062
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.4853






Catch scenarios


Basis
Catches
F
SSB*
SSB*
% SSB change**
% Catch change***
% Advice change^
2020 2020 2020 2021 2021 2021 2021
(t) (ratio) (t) (t) (%) (%) (%)
ICES Basis Advice
MSY approach: FMSY 116871 0.11 1074657 1024476 -5 269 24
Other scenarios
F = 0 0 0 1079518 1146911 6 -100 -100
F = F2019 32624 0.029 1078220 1112876 3 2 -65
Management Plan ^^ 46659 0.043 1077636 1097070 2 47 -50
F = F2019 × 1.2 38750 0.035 1077960 1106193 3 22 -59
F = F2019 × 1.6 51378 0.047 1077442 1092949 1 62 -45
F = F2019 × 2.0 63865 0.059 1076923 1079867 0.3 102 -32.1
Fpa 116871 0.11 1074657 1024476 -5 269 24
Fp.05^^^ 156017 0.15 1072913 983726 -8 398 64
Flim 195077 0.19 1071107 943205 -12 516 107
SSB (2021) = Blim 1071480 2.4 978470 103000 -89 3284 1040
SSB (2021) = Bpa 977149 1.83 1001615 181000 -82 2986 939
SSB (2021) = MSY Btrigger 977149 1.83 1001615 181000 -82 2986 939




Symbol Footnotes
* For this stock, the SSB is determined at spawning time (assumed to be mid-January) and is influenced by fisheries before spawning.
** SSB 2021 relative to SSB 2020.
*** Catches 2020 relative to ICES estimates of catches in 2018 (31 661 t).
^ Advice value 2020 relative to advice value 2019.
^^ The proposed Management Plan where F2020 = 0.043 and F2021 = 0.056 corresponds to a linear increase from F2019 = Fsq towards F = FMSY in 2025; SSB in 2021 is estimated assuming the F2021.
^^^ FP.05 is the maximum value of F applied when SSB > MSY Btrigger and that will result in SSB = Blim with a 95% probability.