Red mullet

Striped red mullet in this region are not subject to overfishing and are not being overfished.Stock assessments are carried out annually by the International Council for the Exploration of the Sea (ICES). The most recent stock assessment was published in 2025 using data up to 2024. The next assessment is expected in 2027.The stock assessment defines reference points for fishing pressure (F) and biomass (B). For fishing pressure, there is a target to keep F at or below Maximum Sustainable Yield (MSY). For biomass, there is no target. However, there is a trigger point (MSY Itrigger). Below this level, F should be reduced to allow the stock to increase.The stock size indicator shows considerable fluctuation over the time series but has remained above the maximum sustainable yield trigger point (MSY Itrigger = 107.27 kg/km²) since 2017. In 2024, stock biomass declined to 266.48 kg/km², down from 447.93 kg/km² in 2023 and 280.46 kg/km² in 2022, but still remained above significantly above MSY Itrigger. Therefore, the stock is currently not subject to overfishing.Fishing pressure (F) has remained slightly above the Maximum Sustainable Yield target (FMSY proxy = 1) since 2019, but below 1.1 FMSY, and has generally been at or close to FMSY since the early 2000s. In 2024, fishing pressure was estimated at 1.035, a decrease from 1.056 in 2023 and 1.072 in 2022. Overall, fishing pressure remains slightly above target levels, though the stock is not considered to be overfished.ICES advises that when the MSY approach is applied, catches should be no more than 1,932 tonnes in each of the years 2026 and 2027. All catches are assumed to be landed. This is a 2.7% decrease in advice from the previous years.

Few appropriate management measures are in place. The main concern in this fishery is that catches have been consistently higher than scientific recommendations.The EU multiannual plan (MAP) for stocks in the North Sea and adjacent waters applies to bycatches of this stock. It aims to ensure that stocks are exploited sustainably and that the decisions on fishing opportunities are based on the most up-to-date scientific information. UK and Norway have not requested ICES to provide advice based on the EU MAP.Striped red mullet is not managed through a Total Allowable Catch (TAC) or quota system, and catches have consistently exceeded scientific advice since 2012, with the exception of 2013. Between 2014 and 2019, average catches were around 473% above recommended levels. Although this gap narrowed in recent years, to 48% and 102% above advice in 2022 and 2023 respectively, catches remain too high. In 2024, reported landings reached 3,289 tonnes, 66% above the advised level of 1,985 tonnes, indicating that management measures continue not follow scientific recommendations.There is no minimum landing size for striped red mullet, and small fish are commonly landed, with recent catches dominated by ages 0 and 1. The species begins maturing at age 1 but is not fully mature until around age 3. Therefore, the stock would benefit from technical measures such as larger mesh sizes, sorting grids, and spatial or temporal closures to reduce catches of juveniles and improve yield stability. Some protection exists in within some Inshore Fisheries Conservation Authorities (IFCA) districts. A 15 cm Minimum Conservation Reference Size applies in the Southern, Cornwall and North Western IFCAs, although sexual maturity typically occurs at approximately 16.9 cm for females and 16.2cm for males.Discards are assumed negligible.The EU and UK both have fishery management measures, which can include catch limits, population targets, and gear restrictions. However, compliance in the EU and UK has been inconsistent, with ongoing challenges in implementing some regulations. The goal of reaching Maximum Sustainable Yield (MSY) by 2020 was missed, with less than half of UK TACs in 2024 following ICES advice. In 2024, the EU and UK reaffirmed their commitment to sustainable fisheries by aligning management with scientific advice to gradually approach MSY. However, no new target date has been set for achieving MSY across all fisheries. The Landing Obligation (LO), an EU law retained by the UK post-Brexit, requires all quota fish to be landed, even if unwanted (over-quota or below minimum size). It aims to encourage more selective fishing methods, reduce bycatch, and improve catch reporting. However, compliance is poor, and accurate discard levels are hard to quantify with current monitoring programmes. The UK is in the process of replacing the LO with country-specific Catching Policies.The Marine Conservation Society views Remote Electronic Monitoring (REM) with cameras is one of the most cost-effective tools for providing reliable fisheries data and aiding informed management decisions. Fully monitored fisheries enhance collaboration, data accuracy, stock recovery, and reduce impacts on marine wildlife and habitats. However, the full potential of REM may only be achieved when it tracks fishing location and documents catch and bycatch, particularly where vulnerable species and habitats are at risk. As of January 2024, the EU is introducing a Remote Electronic Monitoring (REM) mandate for EU vessels, including CCTV cameras on vessels 18m or more that pose a potential risk of non-compliance, within the next 4 years. Across the UK, different approaches to REM are being taken and legislation is expected to be in place across all 4 countries within the next few years.The Fisheries Act (2020) requires the development of Fisheries Management Plans (FMPs) (replacing EU Multi-Annual Plans) in the UK. 43 FMPs have been proposed and are at various stages of development and implementation, these should all be published by the end of 2028. FMPs have the potential to be very important tools for managing UK fisheries, although data limitations may delay them for some stocks. It is also essential the UK governments define and adopt a standardised approach or model across the four nations to a universally defined FMP design, to ensure the consistence, quality and coherence of all the proposal FMPs.The Marine Conservation Society is keen to see publicly available Fishery Management Plans for all commercially exploited stocks, especially where stocks are depleted, that include:An overview of the fishery including current stock status, spatial coverage, current fishing methods and impactsTargets for fishing pressure and biomass, and additional management when those targets are not being met, based on the best 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, including habitat impacts and minimising bycatchStakeholder engagementA Southern North Sea non-quota demersal FMP has been proposed, coordinated by DEFRA that incorporates this stock. At the time of writing, it is too soon to know whether proposed management measures will be effective in managing the stock. For more information about this FMP and expected progress and timelines, see [https://www.gov.uk/government/collections/fisheries-management-plans#published-fmps].

A small proportion of striped red mullet is taken by gillnets. Gillnets in this area can encounter bycatch of non-target fish, mammals and birds. This includes the harbour porpoise which is vulnerable in Europe.In this region, only a small proportion of striped red mullet is taken by gillnets, accounting for around 3.5% of catches. In 2024, most landings were made by demersal seine fisheries (74%), followed by otter trawls (22%), with the remaining 3.5% taken by other gears, including gillnets. Younger fish tend to be found in coastal areas, whereas adult striped red mullet are more widely distributed in offshore waters.Fixed gillnets are vertical panels of netting anchored to the seabed and have minimal physical impact on benthic habitats. However, they pose a high risk of bycatch to non‑target species, particularly cetaceans, and are considered the most harmful fishing gear for small cetaceans globally. In UK waters, harbour porpoises are especially affected, though most cetacean species are vulnerable where their distribution overlaps with gillnet fisheries. Harbour porpoises are listed as Vulnerable in Europe, are protected under UK and EU law, and are a priority feature of several Special Areas of Conservation, though these sites are not yet actively managed. Risk is highest in the Celtic Seas, where gillnet fishing effort is concentrated and bycatch levels are well documented.Gillnets also pose risks to elasmobranchs and seabirds. Threatened shark species such as porbeagle and spurdog are caught as bycatch, although reporting is limited, particularly for prohibited species. Seabird bycatch in gillnets is a growing concern, with diving species most at risk and particularly vulnerable populations in southwest UK waters. Lost gillnets may continue to catch wildlife for weeks through ghost fishing, although economic incentives exist to minimise gear loss. Acoustic deterrent devices, such as pingers, have been shown to reduce harbour porpoise bycatch, but their effectiveness has been limited to date and they may cause disturbance or be less effective for other species. Additional measures, such as larger mesh sizes and spatial restrictions on fishing in sensitive areas, can help reduce bycatch of undersized fish and vulnerable species.UK regulations to reduce the impacts of fishing on marine habitats and wider species are under development, in the meantime most EU regulation have been adopted. Under EU legislation, bycatch species should be managed within scientifically defined or, where data isn’t available, suitability precautionary sustainable exploration limits. If stocks fall below a certain threshold, measures can be brought in such as gear limitations (e.g., mesh size or depth of use), time and/or areas closures, and Minimum Conservation Reference Sizes (MCRS).