Herring
Clupea harengus
What to check for
Location
Northwest and West of Ireland
Technical location
Atlantic, Northeast, Porcupine Bank, West of Ireland, West of Scotland
Caught by
Net (pelagic trawl)
Rating summary
There is no concern for the biomass of autumn spawning Atlantic herring in the Northwest and West of Ireland, and no concern for fishing pressure. Management measures have not been in place long enough to understand their effectiveness. Although catch limits have historically exceeded advice, stock biomass is reported to have recently increased in the stock assessment for this area. Herring in the Northwest and West of Ireland are caught by pelagic trawls. This fishery is well targeted, with little bycatch and no habitat impacts.Rating last updated July 2022.
How we worked out this Rating
There is no concern for the biomass of autumn spawning Atlantic herring in the Northwest and West of Ireland, and no concern for fishing pressure.Route 2 scoring has been applied to this rating owing to the lack of reference points for fishing pressure and biomass. Herring is considered to have medium resilience. This is a data limited stock, and trends are used to indicate fishing pressure and biomass.Stock assessments previously included this Northwest and West of Ireland area (6a south and 7b-c) with the West of Scotland (6a north), the stocks are now assessed separately. This was made possible by the development of a genetically split acoustic survey index. The new stock assessment only uses data from a short time period, more data is needed to provide a more certain assessment.Spawning Stock Biomass (SSB) has generally been increasing since 2016. In 2021 SSB was 189,856 tonnes (t) compared to the average between 2016-2020 of 85,377 t. Therefore, there is no concern for biomass. No indication of recruitment of young fish into the stock is reported.Fishing pressure (F) has predominantly declined since 2016 from a harvest rate of 0.06 to 0.01 in 2021, and is at the lowest level since 2015. The harvest rate in 2021 (0.01) was below the level of fishing at maximum sustainable yield (Fmsy) of 0.034. As the harvest rate is considerably below Fmsy and lower than the long term average (0.024) there is no concern for fishing pressure.ICES advises that when the precautionary approach is applied, catches in 2023 should be no more than 1892 tonnes. Zero catch for this area had been recommended since 2016 due to stock level concerns for the combined stock of this area and West of Scotland (6a north).There are indications that the average length of herring caught in the area has been below target lengths since 2015. This is a cause for concern as it could mean reproductive capacity of individuals is reduced. This is thought to be mostly driven by environmental factors i.e. rising sea temperature, in addition to local factors, such as changes in salinity and trophic and fishery related indicators.
This stock is being assessed separately from autumn spawning herring in Northwest and West of Ireland from 2022. Stock information and management measures have not been in place long enough to be assessed for the separated stocks. Although they exceeded advice, catch limits for this fishery appear to have been effective at improving stock status.There is no precautionary management plan in place for this fishery. The stock has been steadily increasing since 2016 in line with declines in harvest rate which has been consistently below Fmsy since 2017, suggesting that advice to reduce catches has started to be effective at helping the stock to recover. This stock has only been separated from stocks in the wider area for stock assessments in 2022 so effectiveness of management of the stock cannot be assessed yet. ICES advises that when the precautionary approach is applied, catches in 2023 should be no more than 1892 tonnes. However, no total allowable catch (TAC) has been set for this stock area.In 2022 two herring stocks in this area (herring in Division 6a North and herring in Divisions 6a South and 7b-c) that had previously been assessed as one were segregated into two for the stock assessment.The development of a genetic method to split the summer acoustic survey (MSHAS) into the component stocks means that separate advice is now possible. The survey index has been genetically split from 2014–present, but catches are still apportioned geographically (south of 56°N and west of 7°W). This has not been an issue in recent years, as the agreed 6.aS, 7.b–c monitoring TAC has been taken close to the Irish coast at a time when the stocks are geographically isolated. Genetic sampling to split the commercial catches is required, particularly as the stocks recover and fishing expands.Discards are considered negligible.Scientific advice is to avoid negative impacts on the spawning habitat of herring, unless the effects of these activities have been assessed and shown not to be detrimental to the stock. There has been an increase in marine anthropogenic activity, especially in the area of marine renewables. The construction and development of wind farms, for example, results in disturbance to the seabed, as does aggregate extraction. Gravel is an essential habitat for spawning herring.Beyond the advised TAC, harvesting of herring is controlled through an EU Minimum Landing Size (MLS) of 20cm (MCRS, 2018) which is above herring size at maturity of around 17cm.The Republic of Ireland fisheries for the 6a South and 7.b-c stock are managed by local committees. These committees each have a set of local management objectives.Both the EU and UK have fishery management measures in place, which can include catch limits, targets for population sizes and fishing mortality, and controls on what fishing gear can be used and where. In the EU, compliance with regulations has been variable, and there are ongoing challenges with implementing some of them. There was a target for fishing to be at Maximum Sustainable Yield by 2020, but this was not achieved. The Landing Obligation (LO), an EU law that the UK has kept after Brexit, requires all quota fish to be landed, even if they are unwanted (over-quota or below minimum size). It aims to promote more selective fishing methods, reduce bycatch, and improve recording of everything that is caught, not just what is wanted. Compliance with the LO is generally poor and actual levels of discards are difficult to quantify using the current fisheries observer programme. UK administrations are in the process of replacing the landing obligation with country-specific Catching Policies.In the UK, it is too early to tell how effective management is, as the Fisheries Act only came into force in January 2021. The Act requires the development of Fisheries Management Plans (FMPs) (replacing EU Multi-Annual Plans). FMPs are currently in development, but the scope of them remains unclear. They have the potential to be very important tools for managing UK fisheries, although data limitations may delay them for some stocks. MCS is keen to see publicly available FMPs for all commercially exploited stocks, especially where stocks are depleted, that include:Targets for fishing pressure and biomass, and additional management when those targets are not being met, based on the best available scientific evidenceTimeframes for stock recoveryImproved data collection, transparency and accountability, supported by technologies such as Remote Electronic Monitoring (REM)Consideration of wider environmental impacts of the fishery
Herring in the Northwest and West of Ireland are caught by pelagic trawls. This fishery is well targeted, with little bycatch and no habitat impacts.The major part of the herring fishery in the area is carried out by vessels from Ireland and the UK; vessels from the Netherlands, Germany and the Faroes participate in the fishery to a lesser extent. The fishing season runs from late autumn into the spring; 1st October to the end of March the following year. This seasonal herring fishery, is exploited in the open sea by pelagic trawls (single, pair, and freezer-trawlers), with 100% of catch taken by pelagic trawl in 2021. Ring netters have been known to participate, but catch is negligible.Herring fisheries are well targeted and tend to be clean with little bycatch of other fish. The pelagic fisheries on herring are deemed to be some of the cleanest fisheries in terms of bycatch, disturbance of the seabed and discarding. The pelagic spring spawning herring fishery in the West of Scotland and West of Ireland, has little impact upon the seabed, although seabed contact can sometimes occur. Incidental catch of non-target species (bycatch) is negligible. Where incidental catch does occur species may include sprat, horse mackerel or mackerel.Pelagic trawls can be associated with bycatch of marine mammals. Nonetheless, Scottish observer programs, which have been running since 1999, have never recorded any catch of cetaceans within this fishery. Occasional catches of seals have been recorded but it is unclear when this last occurred and what species have been affected. Therefore, interactions with Protected, Endangered or Threatened Species is considered to be low.A potential impact of the herring fishery is the removal of fish that could provide other ecosystem services. Herring are an important forage fish, and important planktivores, and are an integral part of the ecosystem. The ecosystem needs a biomass of herring to graze the plankton and act as prey for other organisms. Ecosystem models of the West of Scotland show herring to be an important mid-tropic level species along with sprat, sandeel, and horse mackerel. They also predate on fish eggs, such as cod, and recent work suggests a link between herring biomass and North Sea cod. If herring biomass is very low other species, such as sandeel, may replace its role or the system may shift in a more dramatic way. There is, however, no recent research on the multispecies interactions in the food web in which herring interact and it is difficult to predict the impact of increasing or reducing the herring biomass on the ecosystem functions as a whole.Research suggests that herring recruitment is better in cooler temperatures, so any increase in sea surface temperature could have negative impacts on the stock.To improve monitoring and reporting of fishing activity, MCS would like to see remote electronic monitoring (REM) with cameras implemented, used and enforced. To reduce the impacts of fishing on the marine environment we would like to see a just transition to the complete removal of bottom towed gear from offshore Marine Protected Areas designated to protect the seabed. We also want to see reduction and mitigation of environmental impacts including emissions and blue carbon habitat damage.
References
Binohlan, C. and Nicolas, B. (Editors) (2022). Atlantic herring (Clupea harengus). Available at https://www.fishbase.se/summary/Clupea-harengus.html [Accessed 03.07.2022]EC (1983). COUNCIL REGULATION (EEC) No 2931/83 of 4 October 1983 amending Regulation (EEC) No 171 /83 laying down certain technical measures for the conservation of fishery resources. Available at https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:31983R2931&from=EL [Accessed 28.07.2022]ICES (2019). Stock Annex: Herring (Clupea harengus) in divisions 6.a and 7.b–c (West of Scotland, West of Ireland). Available at https://www.ices.dk/sites/pub/Publication%20Reports/Stock%20Annexes/2019/her.27.6a7bc_SA.pdf [Accessed 19.07.2022]ICES (2020). Herring Assessment Working Group for the Area South of 62degrees N (HAWG). ICES Scientific Reports, 2:60. 1054 pp. Available at http://www.ices.dk/sites/pub/Publication%20Reports/Expert%20Group%20Report/Fisheries%20Resources%20Steering%20Group/2020/HAWG/01%20HAWG%20Report%202020.pdf [Accessed 06.07.2020]ICES. 2021. EU standing request on catch scenarios for zero TAC stocks 2021; herring (Clupea harengus) in divisions 6.a and 7.b–c (West of Scotland, West of Ireland). In Report of the ICES Advisory Committee, 2021. ICES Advice 2021, sr.2021.07b. https://doi.org/10.17895/ices.advice.8215 [Accessed on 29.07.2021].ICES. 2021. Herring (Clupea harengus) in divisions 6.a and 7.b-c (West of Scotland, West of Ireland). In Report of the ICES Advisory Committee, 2021. ICES Advice 2021, her.27.6a7bc. https://doi.org/10.17895/ices.advice.7772 [Accessed on 29.07.2021].ICES, 2022. Herring (Clupea harengus) in division 6.a South of 56°00’N and West of 07°00’W and 7.b-c (Northwest and West of Ireland). In Report of the ICES Advisory Committee, 2022. ICES Advice 2022, her.27.6aS7bc. https://doi.org/10.17895/ices.advice.20179979ICES. 2022. Working Group on Bycatch of Protected Species (WGBYC). ICES Scientific Reports. 3:107. 168 pp. https://doi.org/10.17895/ices.pub.9256Seafish, 2022. Pelagic Trawl. Available at: https://www.seafish.org/responsible-sourcing/fishing-gear-database/gear/pelagic-trawl/ [Accessed on 11.8.22]
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