Habitat and Biology
Depth zone: Slope (200 m - 1000 m). Vertical distribution: Demersal. Sebastes mentella
is a species with late maturation (matures between 10 and 14 years old), slow growth (can get older than 50 years), and a schooling behaviour. Hence it is considered to be vulnerable to overexploitation. It can therefore only sustain low exploitation rates, and management should be based on that consideration.
Subarea XIV in Greenland waters is believed to be an important nursery area for S. mentella
found in Icelandic waters, but data to estimate the magnitude of this contribution are not available.
Jurisdictional distribution: Shared between nations
Water Area Overview
Spatial Scale: Sub-Regional
Ecoregion: Iceland and East Greenland.
Considered a single stock: Yes
Beaked redfish is taken by Icelandic trawlers using bottom trawl on the continental slope at depths between 450 and 700 m. Small amounts (<2%) of S. marinus
are caught in the fishery and are possibly classified as beaked redfish in the catches.
The average annual catches in 2001–2011 have been about 20 thousand tonnes.
|Catch distribution ||Total landings (2011) = 13 kt, 100% bottom trawl. |
The 2011 data (landings and survey) do not change the perception of the stock and give no reason to change the advice from that given last year: “ICES advises that catches should be no higher than 10 000 t. This value should be a starting point for the adaptive part of a management plan”.
Overall Assessment Results
|Figure 184.108.40.206 Beaked redfish (Sebastes mentella) in Division Va and Subarea XIV (Icelandic slope stock). Left: Landings (thousand tonnes, 1978–2010). Right: Survey biomass in Division Va (Autumn survey). |
Assessment ModelQuality consideration
There are a number of uncertainties in the assessment of Sebastes mentella.
The lack of long time-series of abundance indices prevents the determination of stock status.Scientific basis
|Assessment type ||Trend-based assessment. |
|Input data ||Survey index (Autumn survey Division Va). |
|Discards and bycatch ||There are no discard data, but discarding is not considered to be a major problem. |
|Indicators ||None. |
|Other information ||Stock benchmarked in 2012, but no assessment method agreed. |
|Working group report ||NWWG |
Management unit: YesManagement plans
There are no explicit management objectives for this stock.
Biological State and Trend
|Figure 220.127.116.11 |
Available survey biomass estimates indicate that in Division Va the biomass shows no trend in recent years. No survey biomass estimates where available for 2011.
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 Division Va and Subarea XIV (Icelandic slope stock). Report of the ICES Advisory Committee, 2012. ICES Advice, June 2012. http://www.ices.dk/committe/acom/comwork/report/2012/2012/smn-con.pdf