DATRAS trawl survey litter data ICES Data Centre

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

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

DATRAS spatial distribution of data

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 2012 -2013. 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

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)

DATRAS Litter data format • Data are delivered in a separate record format linked to the parent haul record via a key: Quarter TS_Quarter • Country TS_Country Ship TS_Ship Gear Survey Datasets St. No Haul. No Year yyyy The litter record main fields: LTREF Litter reference list PARAM Parameter LTSZC Litter size Unit. Wgt Weight units (Restricted units: g/haul, kg/km 2) LT_Weight value Unit. Item units (Restricted units: items/haul, items/km 2) LT_Items Number of items LTSRC Litter source TYPPL Type of polymer LTPRP Litter properties

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

Litter data from DATRAS trawl surveys Litter data output on the DATRAS download page Exchange format or litter assessment output https: //datras. ices. dk/Data_products/Download_Data_public. aspx

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

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