DFO Maritimes Research Vessel Trawl Surveys Fish Observations

Helen Hayden, Fisheries and Oceans Canada

Dataset credit

OBIS and OBIS Canada

Contacts

RoleNameOrganization 
Primary contact Helen Hayden Fisheries and Oceans Canada
Secondary contact Don Clark Fisheries and Oceans Canada

Citation

DFO. 2016. DFO Maritimes Research Vessel Trawl Surveys Fish observations. Version 11 In OBIS Canada Digital Collections. Bedford Institute of Oceanography, Dartmouth, NS, Canada. Published by OBIS, Digital http://www.iobis.org/. Accessed on –INSERT DATE
Hayden, H. 2020. DFO Maritimes Research Vessel Trawl Surveys Fish Observations. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/103152409) on yyyy-mm-dd and originated from OBIS (https://obis.org/dataset/3d922162-062c-4ad2-bf4a-f2493bd3a95d)

Abstract

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 project section 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 and vessels. Catch data appear in the "individualcount" and "observedweight" OBIS fields (DwC dynamic properties field)and have been normalised for distance towed. The swept area of each tow can be found in the "samplesize" field of the OBIS schema (DwC dynamic properties field). 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. The OBIS field "collectioncode" identifies which survey series each data record comes from.
Strata statistics required to derive stratified random estimates of catch abundance and biomass can be found on the OBISCanada website http://obiscanada.marinebiodiversity.ca/database/dfo-maritimes-survey-strata-statistics).

Purpose

N/A

Supplemental information

This dataset was downloaded from OBIS (https://obis.org/). The records for only marine mammals, seabirds, sea turtles and rays and sharks were extracted. Records with no longitude/latitude or no date (eventDate) were excluded.
OBIS dataset page:
https://obis.org/dataset/3d922162-062c-4ad2-bf4a-f2493bd3a95d
Data Provider's dataset page:
http://ipt.iobis.org/obiscanada/resource?r=dfogfsdbfish

References

DFO. 2016. DFO Maritimes Research Vessel Trawl Surveys Fish observations. Version 11 In OBIS Canada Digital Collections. Bedford Institute of Oceanography, Dartmouth, NS, Canada. Published by OBIS, Digital http://www.iobis.org/. Accessed on –INSERT DATE

Attributes

Overview

This section explains attributes included in the original dataset. OBIS-SEAMAP restricts the attributes available to the public to date/time, lat/lon and species names/counts only. Should you need other attributes described here, you are encouraged to contact the data provider.

Attributes described below represent those in the original dataset provided by the provider.
All attributes are included in the downloadable file (CSV or ESRI File Geodatabase) for "Complete Set of Dataset".

Attributes in dataset

Attribute (table column)Description
oidInternal ID
idRecord ID
dataset_idDataset ID
scientificnameScientific name
vernacularnameVernacular name
aphiaidAphia ID
taxonranktaxononic rank
individualcountGroup size / individual count
eventdateEvent date (precision varies)
eventtimeEvent time
decimallatitudeLatitude in decimal degrees
decimallongitudeLongitude in decimal degrees
coordinateprecisionCoordinate precision
catalognumberCatalog number
collectioncodeCollection code
occurrencestatusOccurrence status
basisofrecordBasis of record (HumanObservation / MachineObservation)
modifiedDate/time the record was modified
node_idNode ID
occurrenceidOccurrence ID
occurrenceremarksOccurrence remarks
eventidEvent ID
institutioncodeInstitution code
lifestageLife stage
sexGender of the animal if known
speciesSpecies by provider
datasetidDataset ID by provider
countryCountry
localityLocation of ocean
waterbodyDetails of ocean
droppedFlag indicating the record was dropped (always false)
absenceFlag indicating the record represents the absence of the species (always false)
marineFlag indicating the record is for marine life (always true)
OBIS-SEAMAP ID103152409
Seabirds1
Marine mammals2
Sea turtles0
Rays and sharks27
Other species0
Non spatial0
Non species0
Total30
Date, Begin1972-06-28
Date, End2014-08-10
Temporal prec.111110
Latitude40.34 - 45.88
Longitude-69.41 - -56.79
Coord. prec.6 decimal digits
PlatformVarious
Data typeAnimal sighting
EffortN/A
Traveled (km)0
0
Contr. throughiOBIS
Registered2020-06-29
Updated2021-02-05
StatusPublished
Sharing policy CC-BY (All)
Also available in None
See metadata in static HTML
See metadata in FGDC XML
See download history / statistics