Query ICES bottom-trawl survey data (species catch, haul, station) through the DATRAS web services
domain: ices.dk · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Identify the target survey and years using getSurveyList and getSurveyYearList (or the equivalent web service calls documented at datras.ices.dk/WebServices/Webservices.aspx).
Call getHHdata for haul/station metadata (position, gear, depth) for the chosen survey/year/quarter.
Call getHLdata for length-based catch data and getCAdata for age/individual biological data tied to the same hauls.
Alternatively, use the icesDatras R package (from CRAN or the ices-tools-prod GitHub) as a thin wrapper around these same web service calls instead of building raw HTTP requests.
Respect the roughly 1-million-record per-download limit by scoping queries to a single survey/year/quarter rather than requesting the full historical archive in one call.
Known gotchas
No username or password is required for standard DATRAS product downloads, but the per-download record cap means multi-decade, multi-survey pulls must be chunked into multiple calls.
Data covers only ICES-coordinated bottom-trawl surveys (Baltic, North Sea, Celtic Sea, etc.) — it is not a general global trawl-survey source, so confirm the area of interest is actually in scope before building on it.
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