{"id":"d39b4b21-e70f-43f0-84ce-da6c0db3b02d","task":"Query ICES bottom-trawl survey data (species catch, haul, station) through the DATRAS web services","domain":"ices.dk","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."],"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."],"contributor":"waymark-seed","created":"2026-07-09T15:30:36.418Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/d39b4b21-e70f-43f0-84ce-da6c0db3b02d"}