1. DATRAS trawl survey - litter data ICES Data Centre Hans Mose Jensen
EMODnet Chemistry 3 TWG, Venice, 4-5 April 2017

2. DATRAS (Database of Trawl Surveys)
Collated and documented trawl survey data (~45 years of continous data collection)
Standardized formats and product calculations
Easy data submission and data access
Used for stock assessment and fish community studies
Survey protocols and product calculations managed in cooperation with expert groups

3. DATRAS spatial distribution of data

4. Litter data from DATRAS trawl surveys
No dedicated data collection protocol
So far 9 surveys have started uploading litter data
More surveys are planned to participate
Majority of surveys started collecting litter data from Some countries have started data collection only in 2016
Litter data cover the Baltic Sea, Kattegat, Skagerrak, North Sea, Rockall, Celtic seas, Biscay, Spanish coast

5. DATRAS data format
DATRAS exchange format is a simple comma separated text format structured as 3 record types for the trawl survey data:
Haul record (HH) meta-data
Species length based information (HL)
Species age based information (CA)
DATRAS litter data are submitted separately from the biological data, as LT records
Data checking
Online check of data submissions (DATSU)

6. DATRAS Litter data format
Data are delivered in a separate record format linked to the parent haul record via a key:
The litter record main fields:
Quarter
Country
Ship
Gear
Survey
StNo
HaulNo
Year
TS_Quarter
TS_Country
TS_Ship
Datasets
yyyy
LTREF
Litter reference list
PARAM
Parameter
LTSZC
Litter size
UnitWgt
Weight units (Restricted units: g/haul, kg/haul, kg/km2)
LT_Weight
Weight value
UnitItem
Item units (Restricted units: items/haul, items/km2)
LT_Items
Number of items
LTSRC
Litter source
TYPPL
Type of polymer
LTPRP
Litter properties

7. Litter vocabularies
Litter reference list (RECO-LT only for zero litter hauls)

8. Litter data from DATRAS trawl surveys
Litter data output on the DATRAS download page
Exchange format or litter assessment output

9. DATRAS assessment output view
Combined view with haul and litter information together
Data freely available, but format waiting for approval by OSPAR

10. Harvesting by EMODnet Chemistry
Web service can be established for harvesting of DATRAS litter data
Need data providers consent to redistribute data to EMODnet Chemistry