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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
2021
Stock Category
1
Purpose
Advice
Published
Stock Assessment Key
16835
Link to Advice Sheet
https://doi.org/10.17895/ices.advice.7811
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 2018–2020, catches in 2022 should be no more than 2062 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 **
2022
2022
2022
2022
2022
2022
2022
(t)
(t)
(t)
(t)
(t)
(%)
(%)
ICES Basis Advice
MSY approach
2062
2057
2042
15
5
11.8
75
Other scenarios
F2020^
1284
1281
1272
9
3
7.4
8.8
F0.1
1363
1360
1350
10
3
7.8
15.5
FMSY lower
1591
1587
1575
12
4
9.1
35
F2018–2020^
1975
1970
1956
14
5
11.3
67
FMSY upper ***
2062
2057
2042
15
5
11.8
75
Fmax
2604
2598
2579
19
6
14.9
121
Symbol
Footnotes
*
Calculated for dead removals.
**
Advice basis values for 2022 are relative to the 2021 advice value (MAP FMSY advice of 1180 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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