Commerical fisheries catches by ICES Squares 2003-2007 (2010)
requires spatially explicit information on fishing activity affecting the
Baltic Sea marine ecosystem for policy purposes. In order to obtain this
information a joint ICES/HELCOM/OSPAR data call was issued to relevant
authorities of Contracting Parties to deliver information on fishing activity
based on VMS/Log book data. Upon a request by HELCOM the data was processed to
advice data products by ICES Working Group for Spatial Fisheries (WGSFD). Processing of the raw data was
done by ICES WGSFD following Conditions for VMS data use, so as to make use of required specific resources,
knowledge and guarantee of anonymity for specific vessels.
ICES collated Vessel Monitoring System (VMS) and logbook data received; data
from Russia were not received. HELCOM requested advice, as fishing
abrasion pressure maps as well as fishing effort maps, were provided by ICES.
Spatial scope: HELCOM Marine area. All contracting parties except Russia provided data.
Temporal scope: 2009-2013. Calculated values for each year and for each quarter of 2013
Spatial resolution: C-square grid 0.05 x 0.05 degrees
Format: ESRI shapefile (polygon)
maps and shapefiles of fishing intensity and effort were calculated for bottom
contact gear and mid-water trawl and longline for every year in the
period from 2009 to 2013 and for each quarter of 2013. The following
maps were produced:
i) intensity of fishing by each fishing activity for each year in the period from 2009 to 2013;
ii) total intensity for each year in the period from 2009 to 2013;
iii) total intensity and by each fishing activity by quarter in 2013
HELCOM secretariat did the following further processing to the data:
- Conversion to ETRS89LAEA coordinate system
- Added attribute "Reported" to display unreported area (Russian EEZ).
Dataset attribute information:
c-square: Unique reference of the c-square polygon
mid_lat: latitude coordinate of the centroid of c-square inWGS84 decimal degrees
mid_lon: longitude coordinate of the centroid of c-square inWGS84 decimal degrees
Year: Year of fishing activity
quarter: Quarter of the year, if applicable
geargroup: Fishing gear group (Effort maps)
SubsurfSAR: Subsurface swept area ratio (Intensity maps)
SurfSAR: Surface swept area ratio (Intensity maps)
Fishing_ho: Total fishing effort in hours within c-square (Effort maps)
Reported: Yes=Reported data. No= No reported data (area that does not contain effort/intensity value due to lack of reported data).
definitions given in ICES advice to OSPAR, understanding of "fishing intensity" is clarified in the fishing
abrasion pressure maps produced for the advice to OSPAR. Abrasion
pressure is not appropriate for midwater trawls and longlines;
therefore, maps for all gears have been produced using fishing effort as
the number of hours fished, extracted from the submitted VMS data.
methods described by ICES WGSFD, fishing abrasion pressure maps were
produced for mobile bottom-contacting gears. In line with the
methodology, separate maps were produced for surface and subsurface
abrasion. The resulting maps showing fishing abrasion and fishing effort
have also been provided as ESRI shapefile data to HELCOM and are
available via HELCOM Map and Data service. When using these data caveats listed in the section "Conditions of Use" should be considered.
data products display fishing intensity and effort in the Baltic Sea. Largest
swept area ratios and fishing effort for subsurface abrasion of mobile bottom
contacting gear were found in the Southern Baltic and Kattegat. Highest fishing
effort for midwater trawls was located in Eastern Gotland Basin and Gulf of
Riga. Fishing effort using longline gear was mainly focused in Bornholm Basin.
The fishing effort was also calculated per each 174 HELCOM Marine Protected
was also carried out on proportion of fisheries represented by the data. The
proportion of the total landings (by weight) that was recorded by logbooks and are
represented by VMS data increased in 2012 compared to earlier years, in 2012 VMS became mandatory for >12
m vessels. In 2013 VMS data captured 81.6% of total fisheries for all mobile
bottom-contacting gear, for midwater trawls 99.6% of the landings are covered
by VMS, and for the longlines only 23% of the landings are covered by VMS.
Read full advice text here.
The data products derived from the HELCOM requested advice from ICES are downloadable from HELCOM Map and Data service and can be used freely given that the source is cited. Requested advice can be used as appropriate by HELCOM when embarking on further marine policy related issues.
The correct data product citation is following:
ICES. 2015. Fishing abrasion pressure maps for mobile bottom-contacting gears in HELCOM area. HELCOM requested advice from ICES.
When using the data for analysis/assessments the following caveats need to be taken into consideration:
HELCOM Fish Group