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Skate, longnosed

Dipturus oxyrinchus

Method of production - Caught at sea
Capture method - All applicable methods
Capture area - North East Atlantic (FAO 27)
Stock area - All Areas
Stock detail - I-IX
Accreditation -
Fish type - White flat fish

Sustainability rating Click for explaination of rating

This fish, caught by the methods and in the area listed above, is the least sustainable fish to eat and should be avoided. Click on the rating icon above to read more and on the alternatives tab below to find sustainable fish to eat.


Sustainability overview

Although little is known about the stock status or biology of longnose skate, it is likely to be highly vulnerable to over-exploitation given its large body size, slow growth, time taken to mature, and low intrinsic rate of population increase. Avoid eating.

Biology

Longnosed skates belong to the Rajidae family which includes skates and rays. The longnosed skate is a large offshore species growing to a maximum total length of 150cm and weight of 73kg. Length at maturity is above 90cm for females and 70-80cm for males.

Stock information

Stock area
All Areas

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Stock information
The longnosed skate is an offshore species uncommon in UK waters. It is thought that in the Mediterranean, the species is moderately abundant with a standing stock biomass estimated at 1,899t in the western, northern and eastern Mediterranean. Research surveys suggest that it has disappeared from the Irish Sea where it was once targeted commercially. The stock status of this species around Norway, Iceland and the Faroes and in French and Iberian waters is unknown. The International Conservation Union (IUCN) assesses longnosed skate as Near Threatened (2007). The TAC for skates and rays in the North and Norwegian Seas was reduced by 25% from 2007 to 2008. The TAC for areas IIa (Norwegian Sea) and IV (North Sea) dropped by a further 15% between 2009/2010.

Management

There is no specific management plan for demersal elasmobranchs. Given the regional differences in skate assemblages and fisheries, ICES recommends that management measures for elasmobranchs be devloped on a case-by-case basis. Currently these species are managed under a common Total Allowable Catch (TAC). There are also prohibitions on fishing for, retaining and landing some species, including the most severely depleted species taken as bycatch in mixed demersal fisheries. ICES does not advise that general or species specific TACs be established at present because they are not the most effective means to regulate these bycatch species. TACs alone may not adequately protect these species as there are differences amongst species in their vulnerabilities to exploitation and a restrictive TAC may lead to discarding. Instead seasonal and/or area closures, effort restrictions and measures to protect spawning grounds for example are recommended.

Capture information

Skates and rays form an important component of mixed demersal fisheries, taken as bycatch in beam and otter trawls, in seine fisheries and also in targeted fisheries using lines and set nets. This species is routinely landed under a general category of 'skate and rays', however recently the MMO (Marine Management Organisation) has issued a new instruction and guidance for fishermen and merchants to record all individual species of skates and rays around England and Wales, to help build an accurate picture of stocks of skates and rays here. Also targeted by sea anglers. No Minimum Landing Size (MLS) is specified for skates and rays in EU waters outside 6 miles. MLS specified in some coastal waters of England and Wales, e.g. Kent and Essex Sea Fisheries District, 40cm (wing to wing), South Wales 45cm, Cumbria SFC 45cm. Under current EU legislation, where a directed fishery for skates takes place, a mesh size in the cod-end of no less than 28cm is required and no less than 22cm in the rest of the trawl. In 2007, Fisheries Science Partnership projects (fishermen and scientists working together) were conducted to investigate discard survival rates in trawl fisheries to find out the survival rate for skates and rays that would be discarded with the introduction of a maximum landing length. The projects also aimed to develop species identification onboard and contribute to improved data collection. The Skate and Ray Producers Association has recently been working to improve the lack of species specific data by reporting their catches by species, into a central database. This follows previous collaborative work with the Shark Trust and Seafish Industry Authority, to produce an identification guide to help distinguish different species. There is a potential for damage to the seabed from trawling. Trawling is also associated with discarding of unwanted fish, i.e. undersized and/or non-quota and/or over-quota species.

Read more about capture methods

Alternatives

Based on method of production, fish type, and consumer rating: only fish rated 2 and below are included as an alternative in the list below . Click on a name to show the sustainable options available.

Dab Depending on how and where it's caught this species ranges from sustainable to unsustainable. Click the name to display only the sustainable options.

Halibut, Atlantic Depending on how and where it's caught this species ranges from sustainable to unsustainable. Click the name to display only the sustainable options.

Halibut, Pacific

Sole, Dover sole, Common sole Depending on how and where it's caught this species ranges from sustainable to unsustainable. Click the name to display only the sustainable options.

Turbot Depending on how and where it's caught this species ranges from sustainable to unsustainable. Click the name to display only the sustainable options.


References
Shark Trust ID Guide Factsheet www.sharktrust.org

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