DFO Maritimes Research Vessel Trawl S…

Occurrence dataset published by Ocean Biogeographic Information System

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Full Title

DFO Maritimes Research Vessel Trawl Surveys Fish Observations (OBIS Canada)


This is the OBIS-formatted view of the Canadian Department of Fisheries and Oceans (DFO) Maritimes Research Vessel Trawl Surveys. This data is created using a Structured Query Language (SQL) program run against the DFO production database. Refer to the parent metadata record for more information about the surveys. This OBIS product reports the abundance and weight of demersal fish species captured by a variety of trawl gear. Catch rates can be derived using the effort data provided in the "samplesize" field of the OBIS schema. Care should be taken when using multiple types of gear since the catchability of different fish species varies from gear to gear. The OBIS field "locality" contains the DFO stratum number where each tow was conducted. PURPOSE: OBIS-formatted data from Canadian Department of Fisheries and Oceans (DFO) Maritimes Research Vessel Trawl Surveys. OBIS Schema fields implemented in this data set are: InstitutionCode, CatalogNumber, Citation, FieldNumber, collector, YearCollected, MonthCollected, DayCollected, TimeOfDay, startYearCollected, startMonthCollected, startDayCollected, startTimeOfDay, endYearCollected, endMonthCollected, endDayCollected, endTimeOfDay, ContinentOcean, locality, StartLatitude, StartLongitude, EndLatitude, EndLongitude, Latitude, Longitude, MinimumDepth, MaximumDepth, Temperature, samplesize, ScientificName, kingdom, phylum, class, order, family, genus, species, ObservedWeight, ObservedIndividualCount For OBIS Schema concept details see http://www.iobis.org/tech/provider/ Additional fields that can be provided upon request: gear, geardescription, MINIMUMSIZE, MAXIMUMSIZE, AVERAGESIZE, AVERAGESIZE5CM

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129,456 Georeferenced data