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Pelagic Redfish - Barents and Norwegian Seas, 2012
Marine Resource  Fact Sheet
ICES Advice 2012
Pelagic Redfish - Barents and Norwegian Seas, 2012
Fact Sheet Citation  
Beaked Redfish (Sebastes mentella) in Subareas I and II
Owned byInternational Council for the Exploration of the Sea (ICES) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
FAO Names: en - Beaked redfish, fr - Sébaste du Nord, es - Gallineta nórdica, ru - Клювач
Geographic extent of Pelagic Redfish - Barents and Norwegian Seas
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Sub-Regional
Management unit: Yes
 
 
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.
Geographical Distribution
Jurisdictional distribution: Shared between nations

Water Area Overview
Spatial Scale: Sub-Regional


Ecoregion: Barents Sea.
Geo References
Resource Structure
Considered a single stock: Yes
Exploitation
 

The fisheries


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.
Assessment
 
Scientific Advice

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.
Overall Assessment Results
Figure 3.4.5.1 Results from the statistical catch-at-age assessment run showing the estimated recruitment-at-age 2, spawning-stock biomass from 1992 to 2011, and annual fishing mortality coefficients from the demersal and pelagic fleets.
Figure. 3.4.5.2 Beaked redfish Sebastes mentella in Subareas I and II. Recruitment-at-age 2, spawning-stock biomass and total stock biomass estimated from statistical catch-at-age for the period 1992–2011.
Figure 3.4.5.3 Sebastes mentella in Subareas I and II. Total international landings 1965–2011 in national and international waters.
Assessment Model

Scientific 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
Management unit: Yes


Management plans


No specific management objectives have so far been implemented.
Biological State and Trend
Exploitation rate: Appropriate
Abundance level: Unknown
Figure 3.4.5.1

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. Click to openhttp://www.ices.dk/committe/acom/comwork/report/2012/2012/smn-arct.pdf
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