Abundance of sea trout spawners and parr 2018
Short description
This core indicator evaluates the status of coastal sea areas of the Baltic Sea based on the abundance of sea trout parr in rivers where they breed. The determination of whether good status is reached is based on a comparison of the observed parr densities in rearing habitats with the reference potential parr densities in the specified habitats. This dataset displays the result of the indicator in HELCOM Assessment Scale 3 (Division of the Baltic Sea into 17 sub-basins and further division into coastal and offshore areas). Attribute information: "HELCOM_ID" = ID of the HELCOM scale 3 assessment unit "level_2" = Name of the HELCOM scale 2 assessment unit "level_3" = Name of HELCOM scale 3 assessment unit "ICES Subdivision" = ICES assessment unit number "Area (km2)" = Area of the HELCOM scale 3 assessment unit "Indicator_" = Name of the indicator "Unit" = Unit of the indicator "Type" = 1 = boundary values increase/decrease monotonically, 2 = optimum range indicator "Status" = Status of the indicator (“Achieve”, “Fail” or “Not assessed”) "ConfA" = Confidence of classification "ConfT" = Temporal confidence of classification "ConfS" = Spatial confidence of classification "ConfM" = Methodological confidence of classification "notes" = additional info "AULEVEL" = Assessment unit level used for the indicator
Point of contact
HELCOM Secretariat
data@helcom.fi
Spatial extent
['7.526438', '33.796674', '52.535858', '66.424283']
Type
dataset
Metadata information
Identifier
Keywords
Habitats and biotopes ; GEMET - INSPIRE themes, version 1.0 ;

fish ; spawning ground ; GEMET ;

MADS ; HOLAS2 2018 Core indicator ; Core indicator ;

Resource provider(s)
HELCOM Secretariat
data@helcom.fi

Lineage
In total, data was available from 240 sites in about 120 streams and rivers for period 2012-2014. ICES subdivisions 21 to 32 are represented. At least ten sites are included from each of the ICES sub-divisions 25, 27, 30, 31 and 32. The Baltic assessment model focuses on the state of recruitment, which is defined as the observed recruitment (i.e. observed densities) compared to the potential reference recruitment (i.e. maximal densities that could be expected under the given habitat conditions). The model uses electrofishing data of the individual sea trout populations, together with habitat information collected at the same sites, to calculate the trend in population development over time. The examination of the data is site-specific (several sites can exist in one river) but the evaluation of the state of the stock can be concluded on the river level and also at a sub-area level. Average values of recruitment state are calculated for assessment areas, sub-divisions, and, where more countries have streams in one sub-division, for each individual countries (ICES 2011; ICES 2017). At the annual meetings of the International Council for the Exploration of the Seas Baltic Salmon and Trout Assessment Working Group (ICES WGBAST), all available data from the Baltic countries on estimated abundance of sea trout parr (per 100 m2 ) from individual sites are compiled. In 2017, data was available from a total of 257 sites in about 132 streams, which reflects the general situation of data availability. Additional information: http://www.helcom.fi/baltic-sea-trends/indicators/abundance-of-sea-trout-spawners-and-parr/ Link to metadata of dataset used for indicator calculation: http://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/248a0684-cd10-4152-988e-416ad6078208