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| Fact Sheet Title Fact Sheet |
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| Norway lobster - West European Basin (Aran Grounds) |
 | Nephrops on Aran Grounds (FU17) |
| | Data Ownership | | This document provided, maintained and owned by International Council for the Exploration of the Sea (ICES) , is part of ICES Advice data collection. |
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| ident Block | ident Block | | | | Species List: | | Species Ref: en - Norway lobster, fr - Langoustine, es - Cigala |
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| ident Block Norway lobster - West European Basin (Aran Grounds)
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| fao Div |
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| 27.7.b | West of Ireland (Division 27.7.b) |
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| ices Fu Nep |
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| 17 | |
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| Aq Res | Biological Stock: Yes
Value: Sub-Regional
Management unit: No
Reference year: 2012
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| Considered a management unit: An aquatic resource or fishery is
declared as [Fishery] Management Unit if it is
effectively the focus for the application of selected
management methods and measures, within the broader
framework of a management system. According to the FAO
Glossary for Responsible Fishing, "a Fishery Management
Unit (FMU) is a fishery or a portion of a fishery
identified in a Fishery Management Plan (FMP) relevant
to the FMP's management objectives." FMU's may be
organised around fisheries biological, geographic,
economic, technical, social or ecological dimensions ,
and the makeup and attribute of a fishery management
unit depends mainly on the FMP's management
objectives. |
| Jurisdictional distribution: Jurisdictional qualifier (e.g.
"shared", "shared - highly migratory") of the aquatic
resource related with its spatial distribution. |
| Environmental group: Classification of the aquatic
resource according to the environmental group (e.g.
pelagic invertebrate, or demersal fish) to which the
species belong. |
| Reference Year: The Reference Year is the last year considered in the stock assessment and/or fishery status. |
| | | | | | Aq Res State Trend  | Figure 5.4.34.4.1  |
The UWTV surveys conducted since 2002 give estimates of abundance that have fluctuated widely. The 2012 abundance estimate is the lowest in the eleven year time-series. The generally low harvest rate appears to have little impact on observed stock fluctuations and is below F MSY. Habitat Bio Depth Zone: Shelf (50 m - 200 m). Vertical Dist: Demersal/Benthic. The Aran Grounds can be characterized as an area with a relatively high density of small Nephrops. The sex ratio in the catches has a strong seasonal pattern. Environmental influence on the stockThe larval retention mechanisms on the Aran Grounds are not well understood, but fluctuations in UWTV burrow abundance may reflect quite variable recruitment relative to other areas in Subarea VII. Geo Dist Geo Dist: Shared between nations Water Area Overview Spatial Scale: Sub-Regional
Ecoregion: Celtic Sea.
Water Area Overview  | | Water Area Overview Norway lobster - West European Basin (Aran Grounds)
| fao Div | 27.7.b: West of Ireland (Division 27.7.b) | | ices Fu Nep | 17: |
| | | | | | Water Area Overview |
Water Area OverviewNorway lobster - West European Basin (Aran Grounds) Aq Res Struct Biological Stock: Yes Exploit The fisheriesLandings and effort of twin-rig vessels have increased and now account for over 90% of the fishery. In the last few years the fishery has exploited more of the male component of the stock as a higher proportion of catches have been taken in the autumn.
| Catch distribution |
Total catch (2011) = 683 t, where 88% were landings (100% otter trawl) and 12% discards. |
Effects of the fisheries on the ecosystemNephrops fisheries in this area also have catches of hake, megrim, and monkfish. Bio Assess Sci Advice This advice was updated in November 2012 to take account of the most recent UWTV survey information. ICES advises on the basis of the MSY approach that landings in 2013 should be no more than 590 tonnes. To protect the stock in this functional unit, management should be implemented at the functional unit level. Results  | | Figure 5.4.34.4.1 Nephrops on the Aran Grounds (FU 17). Landings (in tonnes), UWTV abundance (in millions; SSB proxy), and harvest rates (FMSY proxy shown as the dashed green line). |
Assess Models Quality considerationUncertainties in the survey, mean weight in the landings, and discard rates are not taken into account in the advice. Biological sampling in this stock is very good. There is a dedicated annual UWTV survey and the results of the 2012 survey were provided to ICES in September 2012 to update the advice. Scientific basis
| Assessment type |
UWTV and trends of the size structure of catches. |
| Input data |
One survey index (UWTV-FU 17), size structure of catches. |
| Discards and bycatch |
Discards are included in the assessment. |
| Indicators |
Sex ratio and lpue. |
| Other information |
The latest benchmark was performed in 2009. The June advice was updated in November to take into account the 2012 survey information. |
| Working group report |
WGCSE |
Management Management unit: No Management plansNo specific management objectives are known to ICES. Sources The above excerpts are from the first two pages of the ICES advice, the supporting information to this advice can be read in full at the following reference: ICES. Nephrops on Aran Grounds (FU17). Report of the ICES Advisory Committee, 2012. ICES Advice, November 2012.  http://www.ices.dk/committe/acom/comwork/report/2012/2012/Nep-VII.pdf |
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