NOAA Ship Gordon Gunter Vessel Line-transect Survey 2023 (GU2301)

NOAA Southeast Fisheries Science Center (NEFSC)

Dataset credit

NOAA Southeast Fisheries Science Center (SEFSC)


Primary contact Laura Dias NOAA Southeast Fisheries Science Center
Secondary contact Lance Garrison NOAA Southeast Fisheries Science Center
Data entry Ei Fujioka Duke University



As part of the Atlantic Marine Assessment Program for Protected Species
(AMAPPS), the Southeast Fisheries Science Center (SEFSC) conducted a
shipboard survey of the U.S. waters of the Western North Atlantic (WNA)
from approximately the 200m isobath out to the U.S. Exclusive Economic
Zone (EEZ). The survey was conducted between February 4 and April 27,
2023 onboard the NOAA Ship Gordon Gunter, for a total of 44 days at sea
split into three survey legs. Multiple days were lost due to mechanical
problems with the ship (Jan 23 to Feb 2) and unfavorable weather
conditions (April 8 to 10). February 3 and April 28 were departure (start
survey) and arrival (end survey) days, respectively. The survey was
designed for a two-team independent visual observer approach with
distance sampling to estimate the detection probabilities for marine
mammal sightings. A sighting constituted a single or group of marine
mammals (whales and dolphins) seen at the same location and time. This
dataset includes marine mammal visual observation data and effort points
with surveying conditions that can be used in abundance and density
modeling per visual line-transect survey protocols. This dataset also
includes opportunistic marine mammal photographs and non-marine
mammal sightings such as sea turtles.


The primary goal was to conduct visual line-transect survey for abundance
estimation, and distribution of cetaceans in the U.S. waters of the Atlantic

Supplemental information

This is a reformatted version of the archive stored in U.S. National Centers for
Environmental Information (NCEI;

Non-animal observations (14 records) are removed.




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
oidUnique ID number (generated by OBIS-SEAMAP)
geomGeometry field added by OBIS-SEAMAP
surveyidSurvey ID (GU2301)
parenteventidParent Event ID
eventidEvent ID
occurrenceidOccurrence ID
recordedbyRecorded by
associatedmediaAssociated media (blank)
verbatimidentificationVerbatim identification
vernacularnameSpecies vernacular name
scientificnameidWoRMS AphiaID
scientificnameScientific name
scientificnameauthorshipScientific name authorship
identificationremarksIdentification remarks
identificationreferencesIdentification references
occurrenceremarksOccurrence remarks
materialsampleidMaterial sample id
preparationsPreparations (blank)
occurrencestatusOccurrence status ("present")
id_levelTaxon level of the identification
sp_tsnTaxonomic Serial Number added by OBIS-SEAMAP
eventdateEvent date
verbatimeventdateSighting date and time
decimallatitudeLongitude in decimal degrees
decimallongitudeLatitude in decimal degrees
eventtypeEvent type ("sighting" for marine mammal sighting; "other" for other species sighting)
basisofrecordBasis of record ("occurrence")
samplingprotocolSampling protocol
eventremarksEvent remarks
datasetnameDataset name by provider
bibliographiccitationBibliographic citation
countrycodeCountry code
highergeographyHigher geography
highergeographyidHigher geography id
geodeticdatumGeodetic datum ("WGS84")
verbatimcoordinatesystemVerbatim coordinate system
institutioncodeInstitution code ("DOC | NOAA | NMFS | SEFSC")
institutionidInstitution id
accessrightsCccess rights
licenseLicense (public domain)
behaviorchangeBehavior change
behaviorinitial1Behavior initial 1
behaviorinitial2Behavior initial 2
behaviorinitial3Behavior initial 3
behaviornew1Behavior new 1
biopsyattemptedBiopsy attempted
biopsycollectedBiopsy collected
birdidentificationBird identification
birdpresenceBird presence
calvesattributesCalves attributes
calvespresenceCalves presence
cookiecuttersharkbitescarCookie cutter shark bite scar
effort1Effort 1
effort2Effort 2
fishidentificationFish identification
fishpresenceFish presence
individualcountIndividual count (average if multiple best counts)
individualcountbestIndividual count best (may be multiple numbers)
individualcountcalvesIndividual count calves
individualcountmaxindividual count max (may be multiple numbers)
individualcountminIndividual count min (may be multiple numbers)
multiplespeciesMultiple species
multiplespeciesremarksmultiple species remarks
neonatespresenceNeonates presence
shapechangeShape change
shapeinitialShape initial
shapenewShape new
sightingremarksSighting remarks
speciesdescriptionSpecies description
vesselapproachVessel approach
vesselmaneuverVessel maneuver
sighting_attributessighting attributes including cues in JSON format
Marine mammals445
Sea turtles7
Rays and sharks4
Other species12
Non spatial0
Non species0
Date, Begin2023-02-04
Date, End2023-04-27
Temporal prec.111111
Latitude24.00 - 38.41
Longitude-86.36 - -70.54
Coord. prec.6 decimal digits
Data typeAnimal sighting
EffortYES (ID: 2292)
Traveled (km)0
Effort hours-1,275
Contr. through
Sharing policy CC0 no rights reserved
Shared with OBIS
GBIF (via DOI)
See metadata in static HTML
See metadata in FGDC XML
See download history / statistics