|Marine Resource Fact Sheet|
|Pelagic Redfish - Barents and Norwegian Seas|
|Beaked Redfish (Sebastes mentella) in Subareas I and II|
|FAO Names: en - Beaked redfish, fr - Sébaste du Nord, es - Gallineta nórdica, ru - Клювач|
|Considered a single stock: Yes Spatial Scale: Sub-Regional|
Management unit: Yes Reference year: 2012
Habitat and Biology
Depth zone: Shelf (50 m - 200 m). Vertical distribution: Demersal/Benthic.
This species is long-lived (maximum age 75 years), and inhabits pelagic and epibenthic habitats from 300 to 1400 m in the North Atlantic. The male and female aggregate to mate; the female releases live larvae (ovoviviparous) along the continental slope from 62°N to 74°N during March–April. The size and age at first maturity (50%) are 31 cm and 11 years. Larvae are pelagic and drift northward along the continental slope in the surface layers and eventually disperse over the shelf in the Barents Sea. The juveniles are predominantly distributed in the Barents Sea and Svalbard areas. Adults are widely distributed on the shelf, slope, and the open ocean, but south of 69°N hardly on the shelf.
Jurisdictional distribution: Shared between nations
Water Area Overview
Spatial Scale: Sub-Regional
Ecoregion: Barents Sea.
Considered a single stock: Yes
A pelagic fishery for S. mentella
has developed in the Norwegian Sea outside EEZs since 2004. This fishery is managed by the North-East Atlantic Fisheries Commission (NEAFC) who, by consensus, adopted a TAC for 2012 of 7500 t. Other catches of S. mentella
are taken as bycatches in the demersal cod/haddock/Greenland halibut fisheries, as juveniles in the shrimp trawl fisheries, and occasionally in the pelagic blue whiting and herring fisheries in the Norwegian Sea.
|Catch distribution ||Total landings (2011) = 12.4 kt, of which 67% is taken by pelagic trawl in international waters in the Norwegian Sea and 33% as bycatch in the Barents Sea and adjacent waters. |
ICES advises on the basis of the MSY approach that a commercial fishery can operate on Sebastes mentella
in Subareas I and II, given that the total catch level, including bycatches and discards, does not exceed 47 000 tonnes. Measures currently in place to protect juveniles have proven successful and should be maintained.
Assessment ModelScientific basis
|Assessment type ||Statistical catch-at-age 1992–2011. The Gadget model and the Schaefer biomass model are used in addition. |
|Input data ||Catch numbers-at-age from the pelagic and demersal fleets and numbers-at-age from three surveys in the Barents Sea (BS-NoRu-Q1-Btr, Eco-NoRu-Q3-Btr, Ru-Q4-Btr). |
|Discards and bycatch ||Not available. |
|Indicators ||Additional information from the Norwegian Sea pelagic surveys, international 0-group survey in Barents Sea (Eco-NoRu-Q3), and Norwegian Sea slope surveys. Cod consumption on juveniles (BS-NoRu-Q1-Btr, Eco-NoRu-Q3-Btr, Ru-Q4-Btr). |
|Other information ||Last benchmark was in February 2012 (ICES, 2012b). Assessment methodology has been revised. |
|Working group report ||AFWG (ICES, 2012a) |
Management unit: YesManagement plans
No specific management objectives have so far been implemented.
Biological State and Trend
|Figure 188.8.131.52 |
Spawning-stock biomass has steadily increased from 1992 to 2005. Due to poor year classes during the period 1996–2003, the spawning-stock biomass is decreasing.
Source of information
The above excerpts are from the first two pages of the ICES advice, the supporting information to this advice can be read in full at the following reference:
ICES. Beaked redfish (Sebastes mentella) in Subareas I and II. Report of the ICES Advisory Committee, 2012. ICES Advice, June 2012. http://www.ices.dk/committe/acom/comwork/report/2012/2012/smn-arct.pdf