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Norway lobster (Nephrops norvegicus) in Division 4.a, Functional Unit 9 (central North Sea, Moray Firth)
StockCode
nep.fu.9
Assessment Year
2022
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
17560
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.19772443.v1
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 MSY approach is applied, and assuming that discard rates and fishery selection patterns do not change from the average of the years 2019–2021, catches in 2023 should be no more than 1249 tonnes. To ensure that the stock in Functional Unit (FU) 9 is exploited sustainably, management should be implemented at the functional unit level. ICES notes the existence of a management plan, developed and adopted by one of the relevant management authorities for Subarea 4. ICES considers this plan to be precautionary when implemented at the functional unit level.
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 (PL + PDD + PSD)
Dead removals (PL + PDD)
Projected landings (PL)
Projected dead discards (PDD)
Projected surviving discards (PSD)
% harvest rate* (for PL + PDD)
% advice change **
2023
2023
2023
2023
2023
2023
2023
(t)
(t)
(t)
(t)
(t)
(%)
(%)
ICES Basis Advice
MSY approach:FMSY
1249
1246
1236
10
3
11.8
-39
Other scenarios
F2021
675
673
668
5
2
6.4
-67
F0.1
826
824
817
7
2
7.8
-60
FMSY lower
964
961
953
8
3
9.1
-53
F2019–2021^
1006
1003
995
8
3
9.5
-51
FMSY upper ***
1249
1246
1236
10
3
11.8
-39
Fmax
1576
1572
1560
12
4
14.9
-24
Symbol
Footnotes
*
Calculated for dead removals.
**
Advice basis values for 2023 are relative to the 2022 advice value (FMSY catch advice of 2062 tonnes).
***
FMSY upper= FMSY for this stock.
^
The harvest rate in 2020 was calculated using an interpolated value for abundance (average of 2019 and 2021).
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