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Fact Sheet Title Fact Sheet |
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Red mullet - Ligurian and North Tyrrhenian Sea |
Mullus barbatus - Ligurian and North Tyrrhenian Sea (GSA 9) |
| 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 - Red mullet, fr - Rouget de vase, es - Salmonete de fango, ru - Султанка обыкновенная (=барабулька) |
Fishery IndicatorsProduction: Landed Volume |
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| ident Block Red mullet - Ligurian and North Tyrrhenian Sea
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gfcm Sub Area |
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9 | Ligurian Sea and North Tyrrhenian Sea |
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Aq Res | Biological Stock: Yes
Value: Sub-Regional Management unit: Yes
Reference year: 2019
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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 In overexploitation, with relatively high biomass. [The GFCM methodology to provide stock status and management advice is described in the Appendix F of the Sixteenth Session of the Scientific Advisory Committee Report. See the Bibliography section.] Habitat Bio Climatic Zone: Temperate. Bottom Type: Soft bottom. Depth Zone: Coastal (0 m - 50 m); Shelf (50 m - 200 m). Horizontal Dist: Neritic; Littoral. Vertical Dist: Demersal/Benthic. Geo Dist Geo Dist: Shared between nations Water Area Overview Spatial Scale: Sub-Regional Water Area Overview | Water Area Overview Red mullet - Ligurian and North Tyrrhenian Sea
gfcm Sub Area | 9: Ligurian Sea and North Tyrrhenian Sea |
| | | | Water Area Overview
| | | | Water Area Overview |
Water Area OverviewRed mullet - Ligurian and North Tyrrhenian Sea Aq Res Struct Biological Stock: Yes Stock assessment in the GFCM area of application is often conducted by management units, based on GSAs. This method does not ensure that the whole stock is assessed, since stocks may cover several different management units. In some cases, when there is scientific evidence of a stock spreading through different GSAs, as well as information on species from different GSAs, existing information is combined across GSAs. This is then defined as a “joint stock assessment of a shared stock”. The GFCM recommends that when scientific evidence of shared stocks exists, joint stock assessments should be attempted. A number of activities aimed at achieving a better definition of stock boundaries are currently being conducted at the GFCM level. [The State of Mediterranean and Black Sea Fisheries, 2016] Exploit The fishing gear used to catch red mullet in GSA 9 together with other species (mixed catches) are gillnets, trammel nets and otter trawls. Discards of red mullet in GSA 9 occur mainly from the catches of otter trawls. Discard data were available in 2006, and for all years since 2009. For the assessment purposes, in the years where discard data were missing, approximations were made taking into account the percentage of catch discarded in the previous and/or following year. Fishery Indicators Type | Measure | Value | Unit | Time period |
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Production | Landed Volume | 844.0 | tonnes | 2019 | Landed Volume | 1204.8 | tonnes | 2018 | Landed Volume | 1460.7 | tonnes | 2017 | Landed Volume | 1221.6 | tonnes | 2016 | Landed Volume | 1183.4 | tonnes | 2015 | Landed Volume | 1181.4 | tonnes | 2014 | Landed Volume | 693.3 | tonnes | 2013 | Landed Volume | 692.9 | tonnes | 2012 | Landed Volume | 805.5 | tonnes | 2011 | Landed Volume | 747.9 | tonnes | 2010 | Landed Volume | 728.3 | tonnes | 2009 | Landed Volume | 727.1 | tonnes | 2008 | Landed Volume | 1096.0 | tonnes | 2007 | Landed Volume | 1049.6 | tonnes | 2006 | Landed Volume | 708.5 | tonnes | 2005 | Landed Volume | 580.7 | tonnes | 2004 | Landed Volume | 1056.7 | tonnes | 2003 |
Bio Assess Data Growth parameters of red mullet in GSA 9 were available from 2006 to 2019 from DCF data. For the aim of the stock assessment a set of von Bertalanffy parameters given by the average along the years was used. Considering the fact that the assignment of the age in the ALK considered the middle of the year as birth date of red mullet, while the a4a model was parameterized with calendar year, it was agreed to shift growth curve by adding 0.5 to t0 for internal consistency in the stock assessment model. M was estimated according to the Chen and Watanabe model (1989). An agreed vector of maturity was used for all red mullet stocks in the western Mediterranean. DCF was the data source for data on catches, landings, discards, LFDs and MEDITS index over 2004-2019. MEDITS data showed large variations between years. In 2017, the survey was carried out in September-October. Due to the variability of survey timing, age 0 class was not included in the tuning indices used for the assessment. Age slicing using a4aGr of the LFDs of landings, discards and survey has been carried out by sex (in combination with sex ratio at length) model and then data were combined. Assess Models Type: Age-structured a4a SCAA model (a4a) (Jardim et al. 2015) and FLBRP package, FLR. Results The estimated SSB and recruitment show a sharp increase in recent years giving the highest of the whole time series. This is consistent with the increase in total catch and the increase in the MEDITS abundance survey indices. Sci Advice Reduce fishing mortality. STF available. Management Management unit: Yes Sources FAO. 2021. General Fisheries Commission for the Mediterranean. Report of the twenty-second session of the Scientific Advisory Committee on Fisheries, online, 22–25 June 2021. FAO Fisheries and Aquaculture Report No. 1347. Rome. https://www.fao.org/3/cb7622en/cb7622en.pdfReport of the Working Group on Stock Assessment of Demersal Species (WGSAD). Online, 18–23 January 2021. https://www.fao.org/gfcm/technical-meetings/detail/en/c/1412431/ Bibliography FAO. 2020. The State of Mediterranean and Black Sea Fisheries 2020. General Fisheries Commission for the Mediterranean. Rome. https://www.fao.org/3/cb2427en/cb2427en.pdfFAO. 2016. The State of Mediterranean and Black Sea Fisheries. General Fisheries Commission for the Mediterranean. Rome, Italy. https://www.fao.org/3/i5496e/i5496e.pdfFAO General Fisheries Commission for the Mediterranean/Commission générale des pêches pour la Méditerranée. Report of the sixteenth session of the Scientific Advisory Committee. St. Julian’s, Malta, 17–20 March 2014/Rapport de la seizième session du Comité scientifique consultatif. Saint Julien, Malte, Malte, 17-20 mars 2014. FAO Fisheries and Aquaculture Report/FAO Rapport sur les pêches et l’aquaculture. No. R1102. Rome. 2015. 250 pp. https://www.fao.org/3/i4381b/i4381b.pdf |
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