HELCOM Metadata catalogue
Cod abundance
Baltic International Trawl Survey (BITS) data (2011-2016) from ICES DATRAS database was used as a base to create a map of cod relative abundance (quarter 1 data, CPUE values per ICES subdivision). Cod = 30cm was included.
For ICES rectangles surveyed by BITS, values shown are the mean CPUE per ICES subdivision based on BITS data, average for 2011-2016. For ICES rectangles not surveyed by BITS, values are calculated as: MAX-value x Weighting factor. The weighting factor is specific to each ICES rectangle, calculated as the ratio between the commercial landings in that rectangle and the commercial landings in the ICES rectangle with highest landings (based on averages for 2011-2016). MAX-value = CPUE according to BITS in the ICES rectangle with highest landings.
ICES rectangles outside the BITS survey area with no reported cod landings were given the value 0.
Values were first log transformed and then normalized.
Simple
- Date (Creation)
- 2018-06-01
- Unique resource identifier
- https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/fa9017eb-a70e-46b2-a2c4-b0c03b9ab581
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GEMET - INSPIRE themes, version 1.0
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Species distribution
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GEMET
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fish
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marine ecology
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- Keywords
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MADS
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HOLAS2
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ecosystem component
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- Use constraints
- Other restrictions
- Other constraints
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Use constraints: Data can be used freely given that the source is cited.
- Access constraints
- Other restrictions
- Other constraints
- Access constraints: No limitations on public access.
- Spatial representation type
- Grid
- Metadata language
- English
- Topic category
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- Environment
- Biota
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- Begin date
- 2011-01-01
- End date
- 2016-12-31
- Unique resource identifier
- EPSG:3035
- Distribution format
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TIFF
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TIFF
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- OnLine resource
- Download dataset ( WWW:LINK-1.0-http--link )
- OnLine resource
- Open in Map Viewer ( WWW:LINK-1.0-http--link )
- Hierarchy level
- Dataset
Conformance result
- Date (Publication)
- 2010-12-08
- Statement
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Data source:
Baltic International trawl survey (BITS) data
- downloaded from DATRAS database ( https://datras.ices.dk)
- average over 2011-2016, quarter 1 only
- fish <30cm excluded
Landings data from EU Joint research Centre ( https://datacollection.jrc.ec.europa.eu/dd/effort/maps) from years 2011-2016 (= fisheries data). Data reported as tonnes / ICES statistical rectangle
Data quality:
The fisheries independent BITS surveys are designed for estimating demersal fish abundance in the Baltic Sea. However, the data in SD 21 (Kattegat) is not standardized with the rest of the area, thus it may not be comparable. Further, the areas outside BITS survey area are based on an estimate derived using landings data.
Attribute information: Ecosystem abundance value from 0 to 1. (Originally: Raster value representing CPUE value / ICES subdivision (within BITS area) or estimated CPUE value / ICES rectangle (outside BITS area), log-transformed and normalised).
Spatial resolution: Original data in ICES rectangles, here 1 km x 1 km grid.
- File identifier
- fa9017eb-a70e-46b2-a2c4-b0c03b9ab581 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2021-09-09T12:02:07
Overviews
Spatial extent
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