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Prawn, Northern, prawns

Pandalus borealis

Method of production - Caught at sea
Capture method - Demersal otter trawl
Capture area - North East Atlantic (FAO 27)
Stock area - Skagerrak and Norwegian Deep
Stock detail - IIIa and IVa
Accreditation -
Fish type - Shellfish

Sustainability rating Click for explaination of rating

This fish, caught by the methods and in the area listed above, is a good sustainable fish to eat. Click on the rating icon above to read more and on the alternatives tab below to find similar fish to eat.


Sustainability overview

The stock is fished sustainably and the stock at the required level. Deep-sea species, e.g. Argentines, roundnose grenadier, rabbitfish and sharks are frequently caught in shrimp trawls in the deeper parts of the Skagerrak and the Norwegian Deep. Sorting grids have been introduced in the Skagerrak to reduce bycatch of non-target fish since February 2013. Grids are compulsorily fitted in nets in all other prawn fisheries in the North Atlantic, including in Norwegian, Canadian and US waters.

Biology

Pandalus borealis, the northern prawn, or cold-water prawn (also known as pink or deepwater shrimp in North America), are crustaceans belonging to the family Pandalidae. The species has a wide distribution throughout the North Atlantic and North Pacific Oceans (the Pacific form is generally regarded as a subspecies, Pandalus borealiseous). The species occurs as far south as the North Sea, Massachusetts, Oregon and Japan. Northern shrimp are hermaphroditic. They develop initially as males, then become female after around 3 years, and complete their lives as females. Life span is around 5 years, although possibly up to 8 years in northern latitudes. They spawn in autumn and females carry the eggs until April/May, when they hatch and the pelagic larvae are released. Total adult length is about 15cm. This species inhabits areas of soft, muddy sediment with a depth range from 20-1300m. Prawns migrate vertically at night to feed on zooplankton. Northern prawn are heavily predated on by fish and marine mammals.

Stock information

Stock area
Skagerrak and Norwegian Deep

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Stock information
The 2012 ICES advice was based on the stock being a data limited stock and not evaluated with regard to precautionary reference points. In 2013 an analytical assessment of the stock is provided. The biomass has been above the MSY trigger level since the beginning of the 1990s and fishing mortality below the required level. ICES advises catches of no more than 6000 t in 2014. ICES also advises that measures should also be taken to address discarding through highgrading.

Management

Capture information

Northern shrimps are mainly caught by 35-45mm single- and twin-trawl nets (minimum legal mesh size 35mm). Demersal nets may be towed between 2 boats as in pair-trawling, or one boat may tow more than one net as in twin or multi-rig otter trawling. It is not unknown for some boats to tow up to 8 or 10 nets. A large number of vessels use sorting grids, to reduce bycatch, on a voluntary basis. When sorting grids are not used bycatch species, dominated by saithe and cod, may constitute up to 30% of the landed catch. Deep-sea species, e.g. Argentines, roundnose grenadier, rabbitfish and sharks are frequently caught in shrimp trawls in the deeper parts of the Skagerrak and the Norwegian Deep. Legislation requiring a species-selective grid has been implemented in the Skaggerak since February 2013.

Read more about capture methods


References
ICES Advice 2013, Book 6

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