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| Marine Resource Fact Sheet |
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| | Sea trout - Baltic Sea, 2006 |
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| | Owned by | International Council for the Exploration of the Sea (ICES)
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| Related observations | Locate in inventory | | | | Species: | Salmo trutta | | | Fao Names : en - Sea trout, fr - Truite de mer, es - Trucha marina |
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| | Distribution of Sea trout - Baltic Sea | |  Map legend
Area Details 
FAO Fishing Statistical Subdivision Areas27.3.c.22: Atlantic, Northeast / 27.3.c.22 27.3.b.23: Atlantic, Northeast / 27.3.b.23 27.3.d.24: Atlantic, Northeast / 27.3.d.24 27.3.d.25: Atlantic, Northeast / 27.3.d.25 27.3.d.26: Atlantic, Northeast / 27.3.d.26 27.3.d.27: Atlantic, Northeast / 27.3.d.27 27.3.d.28: Atlantic, Northeast / 27.3.d.28 27.3.d.29: Atlantic, Northeast / 27.3.d.29 27.3.d.30: Atlantic, Northeast / 27.3.d.30 27.3.d.31: Atlantic, Northeast / 27.3.d.31 27.3.d.32: Atlantic, Northeast / 27.3.d.32 More Geo References | |
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| Main Descriptors | Considered a single stock: Yes
Spatial Scale: Sub-Regional
Considered a management unit: Yes |
| Considered a single stock: A group of individuals in a species occupying a well defined spatial range independent of other stocks of the same species. It can be affected by random dispersal movements and directed migrations due to seasonal or reproductive activity. |
| Spatial Scale: Spatial scale contains a standard term such as Global, Regional (e.g. for the whole Atlantic), sub-regional (e.g. for a part of the Atlantic), national, local (for sub-national levels). |
| Considered a management unit: An aquatic resource or fishery is
declared as [Fishery] Management Unit if it is
effectively the focus for the application of selected
management methods and measures, within the broader
framework of a management system. According to the FAO
Glossary for Responsible Fishing, "a Fishery Management
Unit (FMU) is a fishery or a portion of a fishery
identified in a Fishery Management Plan (FMP) relevant
to the FMP's management objectives." FMU's may be
organised around fisheries biological, geographic,
economic, technical, social or ecological dimensions ,
and the makeup and attribute of a fishery management
unit depends mainly on the FMP's management
objectives. |
| Jurisdictional distribution: Jurisdictional qualifier (e.g.
"shared", "shared - highly migratory") of the aquatic
resource related with its spatial distribution. |
| Environmental group: Classification of the aquatic
resource according to the environmental group (e.g.
pelagic invertebrate, or demersal fish) to which the
species belong. |
| | | | | | Habitat and Biology Depth zone: Shelf Vertical distribution: Demersal/benthic Geographical Distribution Jurisdictional distribution: Shared between nations Water Area Overview Spatial Scale: Sub-Regional Geo References | | Distribution of Sea trout - Baltic Sea
| FAO Fishing Statistical Subdivision Areas | 27.3.c.22: Atlantic, Northeast / 27.3.c.22 | | 27.3.b.23: Atlantic, Northeast / 27.3.b.23 | | 27.3.d.24: Atlantic, Northeast / 27.3.d.24 | | 27.3.d.25: Atlantic, Northeast / 27.3.d.25 | | 27.3.d.26: Atlantic, Northeast / 27.3.d.26 | | 27.3.d.27: Atlantic, Northeast / 27.3.d.27 | | 27.3.d.28: Atlantic, Northeast / 27.3.d.28 | | 27.3.d.29: Atlantic, Northeast / 27.3.d.29 | | 27.3.d.30: Atlantic, Northeast / 27.3.d.30 | | 27.3.d.31: Atlantic, Northeast / 27.3.d.31 | | 27.3.d.32: Atlantic, Northeast / 27.3.d.32 |
| | | | | | Intersecting Major FAO areas and LME areas |
The following area codes have been found as intersecting the distribution of Sea trout - Baltic Sea Resource Structure Considered a single stock: Yes Exploitation Factors affecting the fisheries and the stockThe total sea trout catch from the Baltic Sea was 826 tonnes in 2006, which is 20 tonnes less than in 2005. About 65% of the catch is taken by Poland which mainly targets Polish stocks and potentially long migrating stocks from Sweden and Denmark. Many stocks in the Baltic are supported by stocking. Most of the stocks in the Baltic Sea migrate in the coastal area within about 150 km of the home river, but particularly those from Poland and some from southern Sweden and Denmark migrate further into offshore areas. The fish that migrate only short distances are mainly exploited in coastal and river fisheries, and the coastal salmon fisheries also affects them. In the Gulf of Bothnia and Gulf of Finland there is no specific sea trout fishery, but sea trout are caught as bycatch in fisheries for other species like whitefish, pikeperch, and perch. The majority of the sea trout are caught during their first two years in the sea and before reaching sexual maturity. In the Gulf of Bothnia, sea trout become mature mainly at the age of 3SW (>55 cm). According to the tagging data, less than 5% of the catch has been 3 sea-winter or older fish in the last 15 years (Figure 8.4.16.3). The bottom gillnet fishery targeted at other species than sea trout has had a high effort level in the past 10 years in Finland. Swedish authorities implemented new fishing regulations in the Bothnian Bay area in May 2006, banning gillnet fishing during spring and fall in waters deeper than 3 meters because of the high bycatch of sea trout. The minimum landing size was also raised from 40 to 50 cm in this area. Assessment Assessment Model Assessment Model Entry Data Scientific basisInformation is available from scientific electrofishing, smolt-trapping, fish ladder counts, tag returns, and catch data from the fisheries. The framework for evaluating the state of the sea trout stocks is being reconsidered by ICES and is expected to be finalized in 2008. Overall Assessment Results Landing tableLandings (tonnes) Landing table | | Image |
Figure 8.4.16.1 Densities of 0+ (one-summer-old) trout parr in the trout reproduction areas of some of the Gulf of Bothnian rivers.  | | Image |
Figure 8.4.16.2 Densities of 0+ (one-summer-old) trout parr in the trout reproduction areas of some of the Gulf of Finland rivers. Figure 8.4.16.3Age distribution of recaptures of Carlin-tagged sea trout released in the Bothnian Bay (Subdivision 31) and recaptured in Finland 1984–2005.  | | Image |
Table 8.4.16.1 Sea trout smolt releases (in thousands) to the Baltic Sea by country and Subdivision in 1988–2006. GraphsScientific Advice Management considerationsSea trout that migrate offshore are to a large extent taken as a bycatch in the offshore salmon fishery. Salmon catches are misreported as trout in this offshore salmon fishery and therefore improvement of control measures should be carried out in order to prevent such misreporting.. Many sea trout stocks are widely migratory in the Baltic main basin. This requires an international cooperation when managing these stocks. There is no TAC set for the sea trout, but national regulations include minimum landing size, local and seasonal closures, and minimum mesh sizes for gillnet fishery. Management Considered a management unit: Yes Biological State and Trend Exploitation rate: Undefined
Abundance level: Undefined There are approximately 1000 sea trout stocks in the Baltic Sea and about half of them are wild. There are no estimates of the historical numbers of sea trout populations or quantitative estimates of the total natural smolt production in past years. The status of these populations is very variable – some appear to be in a good state whereas others appear to be in a poor state. Densities of 0+ parr observed in electrofishing surveys show variable recruitment (Figures 8.4.16.1 and 8.4.16.2). Management advice The framework for evaluating the state of the sea trout stocks is being reconsidered by ICES. In the absence of an agreed framework, ICES does not provide advice for the sea trout stocks this year. Source of information Report of the Baltic Salmon and Trout Assessment Working Group, 11–20 April 2007 (ICES CM 2007/ACFM:12). ICES  . |
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