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| Fact Sheet Title Fact Sheet |
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| Norway lobster - West European Basin (Porcupine Bank, Aran Grounds, Ireland NW coast, Ireland SW and SE coast) |
 | Nephrops in Divisions VIIb,c,j,k (Management Area L) |
| | 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 (Porcupine Bank, Aran Grounds, Ireland NW coast, Ireland SW and SE coast) Map tips - Click on
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| fao Div |
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| 27.7.b | West of Ireland (Division 27.7.b) |
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| 27.7.c | Porcupine Bank (Division 27.7.c) |
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| 27.7.j | Southwest of Ireland - East (Division 27.7.j) |
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| 27.7.k | Southwest of Ireland - West (Division 27.7.k) |
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| Aq Res | Biological Stock: Yes Value: Sub-Regional
Management unit: Yes Reference year: 2008
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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 The state of the stock is uncertain. Effort, landings and size distribution indicate that exploitation rate has been high in the last 5 years. Fishery independent survey information indicates that recruitment has been very weak since 2004 and the stock has declined to a low level. Landings per unit of effort (lpue) show a generally declining trend in most fleets over the time-series available. Mean size indicators in all commercial fleets and a survey indicate a large increase in mean size for both sexes in the past five years. There has been a large change in sex ratio in the survey catches and fishery landings with females Nephrops accounting for a larger proportion Landings have declined by 57% between 2007 and 2008. Habitat Bio Depth Zone: Shelf (50 m - 200 m). Vertical Dist: Demersal/Benthic. Geo Dist Geo Dist: National Water Area Overview Spatial Scale: Sub-Regional Water Area Overview  | | Water Area Overview Norway lobster - West European Basin (Porcupine Bank, Aran Grounds, Ireland NW coast, Ireland SW and SE coast)
| fao Div | 27.7.b: West of Ireland (Division 27.7.b) | | 27.7.c: Porcupine Bank (Division 27.7.c) | | 27.7.j: Southwest of Ireland - East (Division 27.7.j) | | 27.7.k: Southwest of Ireland - West (Division 27.7.k) |
| | | | | | Water Area Overview |
Water Area OverviewNorway lobster - West European Basin (Porcupine Bank, Aran Grounds, Ireland NW coast, Ireland SW and SE coast) Aq Res Struct Biological Stock: Yes Exploit Factors affecting the fisheries and the stock Changes in fishing technology and fishing patterns The Nephrops fishery on the Porcupine Bank is both seasonal and opportunistic with increased targeting during periods of high Nephrops emergence and good weather. Effort in the Irish and French fleets increased rapidly between 2003 and 2007 when increasingly Nephrops directed fisheries developed. In 2008, effort declined substantially. Although Spanish effort has not increased there has been a large increase in lpue, indicating increased targeting of Nephrops. The increase in Irish effort is mainly due to increasing enforcement of anglerfish quotas and larger vessels switching to Nephrops fisheries. Bio Assess Assess Models Methodology Scientific basis Data and methods The assessment is based on evidence from several indicators. The available data includes commercial landings compositions for males and females for the main fleets, catch rates and length distributions from the Spanish Porcupine Bank survey (2001–2008) and lpue and effort data for the main fleets. Uncertainties in assessment and forecast Large differences are seen in the length compositions from different countries, which could indicate different selection patterns or different high grading practices between fleets. Nevertheless all data shows a similar trend to larger size in recent years. Combined landed length distributions are used to calculate the exploitation and recruitment proxies. Several uncertainties are associated with this approach, particularly as no length frequency data for Irish landings in 2006 and 2007 and no discard data are available for any fleets. The size distribution and catch rates in fishery-independent survey confirm the weak recent recruitment and decline in stock abundance. There was a year effect in the gear performance during the 2008 survey but this is not expected to change the overall conclusion. The increase in the exploitation proxy is coincident with an increase in effort and landings. There are concerns about the accuracy of the catch statistics and lpue information in some fleets. Growth rates cannot be well determined. Analytical assessments or catch forecasts are not feasible at present. Comparison with previous assessment and advice The assessment is based on similar indicators to last year. The 2008 data shows a continued deterioration in stock status The advice in 2008 was to reduce catches to below 1000 t. Because of the continued decline in the stock, the advice now calls for a reduction in catches to the lowest possible level. Sci Advice Single-stock exploitation boundaries ICES advises on the basis of exploitation boundaries in relation to precautionary considerations that catches in 2010 should be reduced to the lowest possible level. Table 5.4.34.3.1. Nephrops on Porcupine Bank (FU 16). Single-stock exploitation boundaries (advice), management and landings. | Year | ICES advice | ICES advice for Porcupine Bank (FU16) | Recommended Landings VIIbcjk1 | Official Landings
FU16 2 | | 1987 | | | | 2.5 | | 1988 | | | | 2.4 | | 1989 | | | | 2.1 | | 1990 | | | | 1.9 | | 1991 | | | | 1.6 | | 1992 | | | 3.8 | 2.0 | | 1993 | | | ~4.0 | 1.9 | | 1994 | | | ~4.0 | 2.5 | | 1995 | | | ~4.0 | 2.9 | | 1996 | | | 4.0 | 2.2 | | 1997 | | | 4.0 | 2.4 | | 1998 | | | 4.0 | 2.2 | | 1999 | | | 4.0 | 2.3 | | 2000 | | | 4.0 | 0.9 | | 2001 | | | 4.0 | 1.2 | | 2002 | | | 4.44 | 1.3 | | 2003 | | | 4.44 | 0.9 | | 2004 | Restrict landings to 2000–2002 levels | | 3.3 | 1.5 | | 2005 | Restrict landings to 2000–2002 levels | | 3.3 | 2.2 | | 2006 | Restrict landings to 2000–2002 levels | | 3.3 | 2.0 | | 2007 | Constrain effort at recent levels | | -- | 2.0 | | 2008 | Constrain effort at recent levels | | -- | 0.9 | | 2009 | No increase in effort, and average landings (2000-2003) | < 1.0 | | | | 2010 | Reduce catches to lowest possible level | 0 | | | | Weights in ‘000t 1 Previously ICES gave combined advice for FUs 16, 17, 18, and 19, and Other rectangles in this area. 2 This includes inshore rectangles along the southern and southeastern coast of Ireland. | Management Management unit: Yes Advice Management considerations ICES advises that management should be at a smaller scale than the ICES Subarea VII. Management at the Functional Unit level could provide the controls to ensure that catch opportunities and effort are at the same scale as the resource. Nephrops on the Porcupine Bank are fished in relatively deep waters occurring over a fairly widespread area at relatively low abundance. Given the sedentary nature of Nephrops populations closed areas may be an appropriate management tool to recover the stock. Productivity of deep-water Nephrops stocks is generally lower than those on the shelf although individual Nephrops grow to relatively large sizes and attain high market prices. Other deep-water Nephrops stocks off the Spanish and Portuguese coast have collapsed and have been subject to recovery measures for several years, e.g. FUs 25, 26, 27 and 31. Sources ICES.2009.Report of the ICES Advisory Committee, 2009. ICES Advice, 2009. |
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