Seabass

Dicentrarchus labrax

?: Under review How we work out the ratings

What to check for

Location

Bay of Biscay (South), Atlantic Iberian waters

Technical location

Atlantic, Northeast, Bay of Biscay (South), Portuguese Waters (East)

Caught by

Net (purse seine or ring)

Rating summary

Updated: July 2020

Sea bass in southern Bay of Biscay and Atlantic Iberian waters is a data limited stock, and stock identity remains poorly understood. The state of the stock and fishery relative to reference points is unknown and information on abundance and catches is unavailable. There is no concern for the stock biomass but concern for fishing pressure, as catches have been significantly above advised limits. The combination of slow growth, late maturity, spawning aggregation and strong site fidelity, increase the vulnerability of sea bass to overexploitation and localized depletion. The EU multiannual plan for stocks in the Western Waters and adjacent waters applies to this stock, however, as a data-limited stock ICES precautionary approach is applied. Sea bass are not subject to EU TACs (Total Allowable Catch) or quotas, and are caught both commercially and recreationally, at similar levels. Sea bass are caught using a variety of fishing gears (e.g. gillnet, hook and line, trawl and seine), some of which, can have high levels of bycatch of non-target species, and habitat impacts upon the seabed, by abrasion and smothering in this ecoregion. Pelagic trawling in the Bay of Biscay is associated with concerning levels of dolphin bycatch and mortality, particularly of common dolphin. Harbour porpoises are being caught as bycatch off Iberia in set-nets to the extent that the local population of the species may become extinct.

How we worked out this Rating

IN DRAFTCHECKING RE RELEVANCE TO UK MARKET AND FISHERIES.For seabass in southern Bay of Biscay and Iberian waters there is concern for biomass and concern for fishing pressure.This is a data limited stock and does not have reference points, trends are used instead to determine the stocks state. European seabass has a medium resilience to fishing pressure.

There are management measures in place, but they are not precautionary. The stock is poorly managed and requires considerable improvement or specific management measures implemented.

The EU multiannual plan for stocks in the Western Waters and adjacent waters applies to this stock. The MAP stipulates that when the FMSY ranges are not available, fishing opportunities should be based on the best available scientific advice. Consequently, as a data-limited stock, ICES precautionary approach is applied.

ICES cannot quantify total catches as recreational catches cannot be quantified. There is anecdotal information that underreporting is occurring in small artisanal fleets. This presents a number of challenges for management. Relatively little historical data are available on recreational fisheries although several European countries are now carrying out surveys to meet the requirements of the EU Data Collection Framework and for other purposes.

Sea bass are not subject to EU TACs (Total Allowable Catch) and quotas. Landings have been above advice, throughout the period advice has been provided (except in 2013, at 17% of advice). Between 2014 and 2018, on average landings have exceeded advice 152%, which ranged between 137% and 159%.

Under EU regulation, the Minimum Landings Size (MLS) of sea bass in the Northeast Atlantic, is 36 cm total length (EC regulation 850/98). However, in the Bay of Biscay the size at which 50% of females mature is just over 42 cm (ranging between 41.31 cm and 43.08 cm). Therefore, seabass are being caught before they have had chance to reproduce.

Discarding is assumed to be negligible. Portugal: Sea bass discards are recorded by the DCF on-board sampling program, no discards are observed. Spain: No sea bass discards were observed, 2003-2019.

In addition, a variety of national restrictions on commercial fishing for each metier also apply to sea bass. The measures affecting recreational fisheries in Portugal include gear restrictions, a minimum landing size equal to the commercial fishery MLS (36 cm), the total catch of fish and cephalopods by each fisher must be less than 10 kg per day, and prohibition on the sale of catch.

The UK is due to leave the EU on 31st December 2020, and new UK Fisheries legislation is being developed during 2020. MCS will update ratings with new management information when new legislation comes into force.

In the European Union (EU), EU fishing vessels can fish up to 12 nautical miles of any Member State coast, and closer by agreement. There is overarching fisheries legislation for all Member States, but implementation varies between fisheries, Member States and sea basins.
The EU Common Fisheries Policy (CFP) is the primary overarching policy. Its key environmental objectives are to restore and maintain harvested species at healthy levels (above BMSY), and apply the precautionary and ecosystem-based approaches to fisheries management. To achieve the MSY objective, the MSY exploitation rate is supposed to be achieved by 2020, but this seems unlikely to happen.
The CFP also introduced a Landing Obligation (LO) which bans the discarding at sea of species which are subject to catch limits. Some exemptions apply to species with high post-capture survival, and where avoiding unwanted catches is very difficult. These exemptions are outlined in regional discard plans. Despite quota 'uplift' being granted to fleets under the LO, available evidence suggests there has been widespread non-compliance with the policy, and illegal and unreported discarding is likely occurring.
Multi-Annual Plans (MAPs) are a tool for implementing the CFP regionally, with one in place or being developed for each sea basin. They specify fishing mortality targets and ranges for the main targeted species, as well as lower biomass reference points. If populations drop below these points it should trigger a management response. The MAPs also empower Member States to jointly apply measures such as closures, gear or capacity limits, and bycatch limits. There is concern however that the MAPs do not provide adequate safeguards to maintain all stocks at healthy levels.
The EU Technical Measures regulation addresses how, where and when fishing can take place in order to limit unwanted catches and ecosystem impacts. There are common measures that apply to all EU sea basins, and regional measures that vary between sea basins. Measures include Minimum Conservation Reference Sizes (MCRS, previously Minimum Landing Sizes, MLS), gear specifications, mesh sizes, closed areas, and bycatch limits.
The Control Regulation, which is being revised in 2019, addresses application of and compliance with the above, e.g. keeping catches within limits, recording and sharing data, and satellite tracking of vessels over 12 metres (VMS).

Sea bass are caught by a variety of methods (i.e. gillnet, trammel net, longline or hand-line, trawl, and purse seine) in the southern Bay of Biscay and Atlantic Iberian waters.

Sea bass (Dicentrarchus labrax), are caught by commercial and recreational fishers. Seabass fisheries in this area are mainly artisanal, and recreational catch is thought to be as significant as commercial catch, but cannot be quantified. Most commercial sea bass catches are taken in targeted fisheries, although some are caught as bycatch in other fisheries. Spanish and Portuguese vessels represent almost all of the total annual commercial landings in the area. Landings from Portugal are only from the 9a area, while the Spanish landings are distributed equally between the two zones 8c and 9a (186 tonnes and 187 tonnes in 2019, respectively). Artisanal fisheries are mainly observed in this area. Inshore, small day boats operate with relatively little activity in late winter/early spring. Most landings come from the polyvalent mixed fishery (80-99%) using mostly gill nets, trammel nets and longline or hand-line. The landings by purse seiners and trawlers represent a small amount.

Mid-water seine net fisheries have little to no impact on the seabed, as no seabed contact occurs. Vessels mostly operate in depths of 10-200m and use varying mesh sizes. A purse seine is a large wall of netting deployed around an entire school of fish. The seine has floats along the top line with a lead line threaded through rings along the bottom. Once a school of fish is located (either by visual cues such as congregations of seabirds or dolphins, or through use of sonar), a skiff encircles the school with the net and the lead line is pulled in, pursing the net closed. Purse seine sets can easily encircle marine mammals such as dolphins, sea turtles, whales and sharks, along with the target species as the net is set. However, generally purse seines have a very low bycatch rates, and there have been no reports of bycatch of protected, endangered or threatened species within this ecoregion by seine nets.

Sea bass is a widely distributed species in northeast Atlantic shelf waters with a range from southern Norway, through the North Sea, the Irish Sea, the Bay of Biscay, the Mediterranean and the Black Sea to North-west Africa. The species is at the northern limits of its range around the British Isles and southern Scandinavia. Expansions of sea bass populations is thought to coincide with periods of ocean warming. Therefore, temporal changes may alter the distribution of sea bass stocks over time.

References

Bycatch Management Information System (2020). Purse seine. Available at https://www.bmis-bycatch.org/fishing-gear/purse-seine [Accessed 23.07.2020]

Dars, C., Dabin, W., Demaret, F., Doremus, G., Meheust, E., Mendez-Fernandez, P., Peltier, H., Spitz, J. and Van Canneyt, O. (2017). Les echouages de mammiferes marins sur le littoral francais en 2017. Reseau National Echouages (RNE), Rapport annuel. Available at http://www.observatoire-pelagis.cnrs.fr/IMG/pdf/rapportechouages2017.pdf [Accessed on 23.07.2020]

Drogou, M. (2013). Stock Annex: Seabass (Dicentrarchus labrax) in divisions 8.c and 9.a (southern Bay of Biscay and Atlantic Iberian waters). Available at http://www.ices.dk/sites/pub/Publication%20Reports/Stock%20Annexes/2016/bss-8c9a_SA.pdf [Accessed 22.07.2020]

EU (2019). Regulation (EU) 2019/472 of the European Parliament and of the Council of 19 March 2019 establishing a multiannual plan for stocks fished in the Western Waters and adjacent waters, and for fisheries exploiting those stocks, amending Regulations (EU) 2016/1139 and (EU) 2018/973, and repealing Council Regulations (EC) No 811/2004, (EC) No 2166/2005, (EC) No 388/2006, (EC) No 509/2007 and (EC) No 1300/2008. Official Journal of the European Union, L 83. 17 pp. Available at http://data.europa.eu/eli/reg/2019/472/oj [Accessed 22.07.2020]

Froese, R. and Luna, S. (2020). European seabass, Dicentrarchus labrax. Available at https://www.fishbase.se/summary/dicentrarchus-labrax.html [Accessed 24.07.2020]

ICES (2019). Bay of Biscay and the Iberian Coast ecoregion - “ Ecosystem overview. Available at http://ices.dk/sites/pub/Publication%20Reports/Advice/2019/2019/EcosystemOverview_BayofBiscayandIberianWaters_2019.pdf [Accessed 23.07.2020]

ICES (2019). Bay of Biscay and Iberian Coast ecoregion - “ Fisheries overview, including mixed-fisheries considerations. Available at http://ices.dk/sites/pub/Publication%20Reports/Advice/2019/2019/FisheriesOverviews_BoBIberian_2019.pdf [Accessed 23.07.2020]

ICES (2019). Seabass (Dicentrarchus labrax) in divisions 8.c and 9.a (southern Bay of Biscay and Atlantic Iberian waters). In Report of the ICES Advisory Committee, 2019. ICES Advice 2019, bss.27.8c9a, https://doi.org/10.17895/ices.advice.4758. Available at http://ices.dk/sites/pub/Publication%20Reports/Advice/2019/2019/bss.27.8c9a.pdf [Accessed 22.07.2020]

ICES (2020). EU request on emergency measures to prevent bycatch of common dolphin (Delphinus delphis) and Baltic Proper harbour porpoise (Phocoena phocoena) in the Northeast Atlantic. Available at http://ices.dk/sites/pub/Publication%20Reports/Advice/2020/Special_Requests/eu.2020.04.pdf [Accessed 22.07.2020]

ICES (2020). Working Group for the Bay of Biscay and the Iberian Waters Ecoregion (WGBIE). ICES Scientific Reports. 2:49. http://doi.org/10.17895/ices.pub.6033. Available at http://www.ices.dk/sites/pub/Publication%20Reports/Expert%20Group%20Report/Fisheries%20Resources%20Steering%20Group/2020/WGBIE_2020.pdf [Accessed 22.07.2020]

Peltier, H., Authier, M., Deaville, R., Dabin, W., Jepson, P. D., van Canneyt, O., Daniel, P. and Ridoux, V. (2016). Small cetacean bycatch as estimated from stranding schemes: The common dolphin case in the northeast Atlantic. Environmental Science and Policy, 63: 7-18. doi: 10.1016/j.envsci.2016.05.004. Available at https://www.sciencedirect.com/science/article/abs/pii/S1462901116301514 [Accessed 23.07.2020]

Peltier H., Authier M., Caurant F., Dabin W., Dars C., Demaret F., Meheust E., Ridoux V., Van Canneyt, O. and Spitz, J. (2019). Etat des connaissances sur les captures accidentelles de dauphins communs dans le golfe de Gascogne - “ Synth ¨se 2019. Rapport scientifique dans le cadre de la convention avec le MTES. Observatoire PELAGIS - “ UMS 3462, La Rochelle Universit © / CNRS, 23 pages. Available at https://www.observatoire-pelagis.cnrs.fr/IMG/pdf/Rapports/ByCatch_Rapport_CAPECET_DEB_2019.pdf [Accessed 18.09.2020]