DFO Newfoundland and Labrador Region Ecosystem Trawl Surveys

OBIS and OBIS Canada

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.

N/A

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

The dataset has been updated over time as outlined below. Each entry includes the version number, release date, type of change, and a short description.

Overview

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
oid
id
dataset_id
scientificname
vernacularname
aphiaid
taxonrank
individualcount
eventdate
eventtime
decimallatitude
decimallongitude
coordinateprecision
catalognumber
collectioncode
occurrencestatus
basisofrecord
modified
node_id
occurrenceid
occurrenceremarks
eventid
institutioncode
lifestage
sex
species
datasetid
country
locality
waterbody
dropped
absence
marine
obs_datetime
tprecision
on_land
date_in_future