DFO Newfoundland and Labrador Region Ecosystem Trawl Surveys

Debbie Power, Fisheries and Oceans Canada

Dataset credit

OBIS and OBIS Canada

Contacts

RoleNameOrganization 
Primary contact Debbie Power Fisheries and Oceans Canada
Secondary contact Fran Mowbray Fisheries and Oceans Canada

Citation

Brodie, Bill, Mowbray, Fran and Power, Debbie, 2013. DFO Newfoundland and Labrador Region Ecosystem Trawl Surveys. Version 1 In OBIS Canada Digital Collections. Bedford Institute of Oceanography, Dartmouth, NS, Canada. Published by OBIS, Digital http://www.iobis.org/. Accessed on –INSERT DATE
Power, D. 2020. DFO Newfoundland and Labrador Region Ecosystem Trawl Surveys. Data downloaded from OBIS-SEAMAP (http://seamap.env.duke.edu/dataset/103152590) on yyyy-mm-dd and originated from OBIS (https://obis.org/dataset/f1a11336-64b8-46f4-ba10-5095d150039f)

Abstract

An OBIS version of the Fisheries and Oceans Canada Newfoundland and Labrador region (DFO-NL) ecosystem trawl survey data from 1977-2011. Survey data are collected by DFO stock assessment staff during stratified random seasonal (spring and fall) bottom trawl surveys. These surveys were initially designed to estimate abundance and distribution of commercial groundfish species, but since 1995 have also been regularly recording non-commercial species and invertebrates. The area surveyed has varied over time, as has the trawl gear used and the fishing methodology (tow duration) employed. Note in some years the ‘fall’ survey (usually Oct-Dec), continued January of the following calendar year.

This dataset is the OBIS version of the 'bottom trawl' dataset and only species presence information is included at this time for standard sets.

Taxonomic limitations
Due to the emphasis on commercial fish species, taxonomic classifications of non-commercial fish and invertebrates prior to 1995 were frequently limited to genus or family and sometimes order. With the introduction of the Campelen trawl came a major change in the taxonomic detail recorded and by 2008 efforts were made to identify all fish to species, when possible. However although improved, identifications of some invertebrate taxa continue to be recorded at higher taxonomic levels. Consequently the absence of records for a particular species cannot be equated with an absence of the species, particularly when higher taxonomic classifications are present.

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/f1a11336-64b8-46f4-ba10-5095d150039f
Data Provider's dataset page:
http://ipt.iobis.org/obiscanada/resource?r=dfo_nl_groundfish

References

Brodie, Bill, Mowbray, Fran and Power, Debbie, 2013. DFO Newfoundland and Labrador Region Ecosystem Trawl Surveys. Version 1 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 ID103152590
Seabirds1
Marine mammals39
Sea turtles0
Rays and sharks484
Other species0
Non spatial0
Non species0
Total524
Date, Begin1980-12-06
Date, End2011-12-18
Temporal prec.111110
Latitude42.74 - 57.60
Longitude-59.92 - -44.95
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