Mackerel

Scomber scombrus

Method of production — Caught at sea
Capture method — Handline
Capture area — North East Atlantic (FAO 27)
Stock area — Southern, Western & North Sea
Stock detail

South West


Picture of Mackerel

Sustainability rating two info

Sustainability overview

The best choice for mackerel remains fish caught locally using traditional hand lining methods.

Biology

Mackerel is a fast swimming species belonging to a group of fish known as the scombrid family, which are related to the tuna. They are found in brackish marine waters in depths of up to 1000 m (though more normally in depths of 0-200 m). Abundant in cold and temperate shelf areas, they form large schools near the surface. They overwinter in deeper waters but move closer to shore in spring when water temperatures range between 11 degrees and 14 degrees C. Mainly diurnal, they feed on zooplankton and small fish. Mackerel are batch spawners, they spawn mainly in March to July; the eggs and larvae are pelagic. After spawning, the adults feed very actively, moving around in small shoals. By 3 years old, most mackerel are mature (at a length of approximately 28 cm). Females shed their eggs in about twenty separate batches over the course of the spawning season. Juvenile mackerel grow quickly and can reach 22 cm after one year, and 30cm after 2 years. Mackerel can attain a maximum length of about 70 cm and weight of 3.4 kg.They may live for more than 20 years.

Stock information

Criterion score: 0.5 info

Stock Area

Southern, Western & North Sea

Stock information

Northeast Atlantic (NEA) mackerel is assessed as one stock, but comprises three spawning components: the combined southern and western components and a separate North Sea spawning component. Only the North Sea component is sufficiently distinct to be clearly identified as a separate spawning component. Catch and survey data from recent years indicate that the stock has expanded northwestwards during spawning and the summer feeding migration. This distributional change may reflect changes in food availability and may be linked to increased water temperature, and/or increased stock size.

The spawning component of the stock has increased considerably since 2002 and remains high, above all required levels of sustainability. The North Sea component, however, has been long depleted and requires maximum possible protection and the recommendation is that measures to protect this component remain in place.

Based on the most recent scientific advice (September 2017), the stock is assessed as having full reproductive capacity. Spawning Stock Biomass (SSB) is estimated to have increased since the early 2000s and has been above MSY-Btrigger since 2008. The fishing mortality (F) has been declining from high levels in the mid-2000s but remains above FMSY. There has been a succession of large year classes since the early 2000s.

ICES advises that when the MSY approach is applied, catches in 2018 should be no more than 550 948 tonnes (857 185 tonnes in 2017; 667 385 tonnes in 2016; between 831 000 tonnes and 906 000 tonnes in 2015; 927 000 tonnes and 1,011,000 tonnes in 2014; 497,000 and 542,000 t in 2013).

Management

Criterion score: 0 info

Since the introduction of the coastal states agreement in the mid 90’s between the EU, Norway and Faroe Islands, the management of this stock has evolved into a successful, science-based plan with fishing effort set at a sustainable level.
The management plan for the NEA mackerel stock, evaluated by ICES as precautionary, was agreed by Norway, Faroe Islands, and the EU in October 2008.

The Mackerel Industry Northern Sustainability Alliance (MINSA) North East Atlantic mackerel fishery, formed of 7 fisheries previously engaged in the MSC programme independently, and made up of over 700 fishing boats from small coastal handline vessels through to large ocean-going pelagic trawlers from eleven countries, was certified in May 2016 as a well-managed and sustainable fishery in accordance with the MSC’s Principles and Criteria for Sustainable Fishing. The handline fishery in southwest England was one of the first fisheries to be certified as an environmentally responsible fishery by the Marine Stewardship Council (MSC) in 2001. Due to the cost of maintaining it a decision not to renew its certification was made in February 2012.

Capture Information

Criterion score: 0 info

The fishery is located off the southwest coast of England, from Start Point to Hartland Point within UK territorial waters; this falls within the International Council for the Exploration of the Seas (ICES) areas VIIe,f,g & h. Most of the fishing occurs within 6-8 nautical miles of shore and targets mackerel from the western component of the stock. The main ports are Newlyn and Looe, with landings also taking place in Plymouth, St Ives, Mevagissey and other ports. The handline method uses either braided twine or strong nylon lines to which hooks are attached. Coloured plastic or feathers are attached to these hooks to attract fish and the line is weighted with lead. Each handline has 25-30 hooks. Since 1998 the fishery has been granted special quota allocation under authority of the Marine Management Organisation (MMO). Allocation is set at 1,750 tonnes or 0.83% of the UK quota, whichever is the larger. Up to 150 vessels can be fishing in winter. Most of these are under 10m. Many are 5-8 m single-handed open boats. The minimum landing size for mackerel in EU waters is 20cm (30cm in the North Sea). Juvenile mackerel are protected within an area known as the Mackerel Box, an area off the Cornish coast in the South Western Approaches, created in 1981 and extended in 1989, in which there is a ban on targeted fishing for mackerel by trawlers and purse seiners and where handliners are the only fishermen allowed to target mackerel.

References

ICES Advice 2017 http://www.ices.dk/sites/pub/Publication%20Reports/Advice/2017/2017/mac.27.nea.pdf
ICES Advice 2016, Book 9 http://www.ices.dk/sites/pub/Publication%20Reports/Advice/2016/2016/mac-nea.pdf
ICES Advice 2015, Book 9 http://www.ices.dk/sites/pub/Publication%20Reports/Advice/2015/2015/mac-nea.pdf
http://www.msc.org/track-a-fishery/fisheries-in-the-program/in-assessment/north-east-atlantic/minsa-north-east-atlantic-mackerel https://www.msc.org/track-a-fishery/fisheries-in-the-program/certified/north-east-atlantic/minsa-north-east-atlantic-mackerel/minsa-north-east-atlantic-mackerel