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| Fact Sheet Title Fact Sheet |
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| Deepwater rose shrimp - Northern Tunisia, Malta Island, South of Sicily |
 | Parapenaeus longirostris – Northern Tunisia, Malta Island, South of Sicily |
| | Data Ownership | | This document provided, maintained and owned by General Fisheries Commission for the Mediterranean (GFCM) , is part of GFCM Stock Status Reports data collection. |
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| ident Block | ident Block | | | | Species List: | | Species Ref: en - Deep-water rose shrimp, fr - Crevette rose du large, es - Gamba de altura, ar - إيربيان وردية أعماق المياه, zh - 长额拟对虾, ru - Креветка розовая глубоководная |
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| ident Block Deepwater rose shrimp - Northern Tunisia, Malta Island, South of Sicily
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| gfcm Sub Area |
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| 12 | Northern Tunisia |
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| 15 | Malta Island |
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| 16 | South of Sicily |
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| Aq Res | Biological Stock: Yes
Value: Sub-Regional
Reference year: 2010 |
| 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. |
| | | | | | Habitat Bio Climatic Zone: Temperate. Bottom Type: Soft bottom. Depth Zone: Slope (200 m - 1000 m). Horizontal Dist: Neritic. Vertical Dist: Demersal/Benthic. Geo Dist Geo Dist: Shared between nations Water Area Overview Spatial Scale: Sub-Regional Northern Tunisia, Malta Island, South of Sicily Water Area Overview  | | Water Area Overview Deepwater rose shrimp - Northern Tunisia, Malta Island, South of Sicily
| gfcm Sub Area | 12: Northern Tunisia | | 15: Malta Island | | 16: South of Sicily |
| | | | | | Water Area Overview
| | | | | | Water Area Overview |
Water Area OverviewDeepwater rose shrimp - Northern Tunisia, Malta Island, South of Sicily Aq Res Struct Biological Stock: Yes Exploit Sicilian trawlers between 12-24m LOA (length over all) which target deep water rose shrimp ( Parapenaeus longirostris) are based in seven harbours along the southern coasts of Sicily. These trawlers (about 150 boats in 2009) operate mainly on a short-distance basis, with trips of 1 to 2 days, on outer shelf and upper slope. The distant trawlers of Mazara Del Vallo (about 140 boats in 2009) represent the main commercial fleet of trawlers in the area, and are one of the most important fleets in the Mediterranean. In contrast to the other Sicilian fleets, the large trawlers of the Mazara fleet (LOA>24m) are employed on long fishing trips (3–4 weeks) in offshore waters. Distant trawlers operate in both national and international waters in the Strait of Sicily. In the Maltese Islands small vessels, measuring 12-24m in length, target rose shrimp at depths of about 600m, with fishing grounds located north/north-west of Maltese archipelagos, as well as to the west/south-west of Malta. Catches are primarily destined to the local market. Tunisian vessels target P. longirostris primarily in Northern Tunisia, with 90% of the country’s total catches originating in this region. The most part of the Tunisian catch is landed in Bizerte. Bio Assess Data Data was derived from indirect (fisheries monitoring) sources, the Tunisian National Data Collection Program and the EU Data Collection Framework. The biological parameters used were: L inf = 42.71; k = 0.67; t 0 = -0.208; a = 0.0029; b = 2.4818; M = 1.05 for females; 33.56; 0.73; -0.13 and M = 1.2; a = 0.0034; b = 2.4096 for males, and L inf = 44.56; k = 0.6; t o = -0.118 and M = 1.115 a = 0.0033 and b = 2.4572 for combined sexes respectively. Also, a price vector according the commercial categories has been prepared. This price vector is incorporated to the data base in order to diagnosis the value per recruit (income) of the fishery according some management scenarios. The analysis is carried out by sex and by fleet segments. Assess Models Type: Age-structured Yield per Recruit (Y/R) Methodology Stock status was assessed by using a Y/R and SSB/R analysis with the VIT, ANALEN and Yield packages. Analyses were based on LFD (length-frequency data) by sexes. Virtual Population Analysis (VPA) Methodology Current F was assessed using a steady state VPA with VIT by length on mean LFD of 2007, 2008, 2009 and 2010 raised to the total landings. Results VPA and Y/R values by sex were combined to obtain single values (mean weighted by sex ratio in number) for both the sexes. Current fishing mortality (F c) for both sexes is 1.2. Target Reference Point F 0.1 is 0.92. The analysis of the income per recruit showed that a further reduction in F is necessary for increasing the overall income per recruit. Assuming that the exploitation pattern of the small trawlers remains the same, this reduction will decrease the income of the Italian small trawlers. Since F c is higher than F 0.1 the stock is in overfishing status. However, taking into account F 0.1 as reference point, no risk of depletion was recognized. Sci Advice For scientific researchIn order to make the assessment more robust, a trawl survey covering the whole area (GSA 12; 13; 14; 15 and 16) should be planned. This activity would allow to better describe the spatial distribution of ontogenetic phases of P. longirostris in the area, including the position of nurseries and spawning areas. For management considerationCurrent F should be reduced by around 20% for deepwater rose shrimp in the south-central Mediterranean. A reduction in F should primarily involve small trawl vessels (12-24m length), which target juvenile shrimp. In addition, the selection pattern of the fishery should be improved. A 20% increase of minimum catch length would lead to a significant increase in SSB (spawning stock biomass), as well as a gain of 6% in sustainable yield for large trawl fleets. A protection of nursery areas in the Strait of Sicily is also recommended in order to improve the status of the stock and the fisheries targeting it. Stable nurseries of this species have been identified on the Adventure and Malta Banks, in the Strait of Sicily. Sources Report of the Working Group on Stock Assessment of Demersal Species. FAO-GFCM Chania, Crete (Greece) 24-29 October 2011. 2011 FAO  http://151.1.154.86/GfcmWebSite/SAC/SCSA/WG_Demersal_Species/2011/WGSA_Demersal-Greece-Report.pdf |
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