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Fact Sheet Title Fact Sheet |
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Common cuttlefish - Northern Adriatic Sea |
Sepia officinalis - Northern Adriatic Sea (GSA 17) |
| 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 - Common cuttlefish, fr - Seiche commune, es - Sepia común |
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| ident Block Common cuttlefish - Northern Adriatic Sea
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gfcm Sub Area |
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17 | Northern Adriatic |
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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 Overexploited with low fishing mortality. [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. Vertical Dist: Demersal/Benthic. Geo Dist Geo Dist: Unspecified Water Area Overview Spatial Scale: Sub-Regional Water Area Overview | Water Area Overview Common cuttlefish - Northern Adriatic Sea
gfcm Sub Area | 17: Northern Adriatic |
| | | | Water Area Overview
| | | | Water Area Overview |
Water Area OverviewCommon cuttlefish - Northern Adriatic 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 common cuttlefish is a valuable resource in the northern Adriatic Sea (GSA 17) where it is targeted by trawled gear (otter trawl, “rapido” trawl) and set gear (trammel nets, pots and fyke nets). The stock is shared by Slovenian, Croatian and Italian fleets, with the latter accounting for an average of more than 90 percent of catches per year. The reproductive behaviour of the species influences its catchability: during fall the recruits move from coastal waters (nursery) to the circalittoral zone (feeding ground) and in the next spring the same cohort goes back to the shallower infralittoral region to spawn and, subsequently, die (semelparous species). Indeed, recruits dominate trawl landings whether the coastal fishery targets mainly adults during the spawning time. Historical catches trend is declining, and from 2010 onward some of the lowest values have been registered. Bio Assess Data Landings for Italy (1973-2019), Slovenia (1992-2019) and Croatia (1992-2019); and SoleMon survey index (2005-2019). Data for Croatia and Slovenia were available from 1992 onward, while Italian data were available from 1973. To obtain a coherent time series, Croatian and Slovenian landings were reconstructed back to 1973 for each country (x) and year (y) as Catch x, y = Catch ITA, y*. Assess Models Type: Biomass-aggregated CMSY CMSY (Froese et al., 2017): Bayesian state-space implementation of the Schaefer surplus production model. Priors for final depletion obtained with abundance maximum sustainable yield (AMSY) (Froese et al., 2020). Comparison were made with Just Another Bayesian Biomass Assessment (JABBA) model (Winker et al., 2018). Results The biomass trend showed an almost monotonous decline in the early part of the time series, until 1988, then it oscillated without large spikes until 2007. In 2008 a steep decline was observed which led the biomass to fall below 0.5 B/Bmsy in 2009. From 2012 onward, the biomass gradually increased and in 2019 it was approaching again 0.5 B/Bmsy. Exploitation highly oscillated during the whole time series. Until 2001 high spikes were observed, alternated to years of exploitation at values close to Fmsy. Subsequently F remained quite above Fmsy for the period 2002-2016, with many ups and downs. In 2016-2019 F continuously declined and was slightly below Fmsy in 2019. Sci Advice Reduce fishing mortality and/or implement recovery plan. 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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