SWFSC Marine Mammal Survey, CLAWS 2015, Cruise 1648

NOAA Southwest Fisheries Science Center (SWFSC)

Dataset credit

NOAA Southwest Fisheries Science Center (SWFSC)


Primary contact Jeffrey Moore Southwest Fisheries Science Center, NOAA
Secondary contact Dave Weller NOAA Southwest Fisheries Science Center
Data entry Ei Fujioka Duke University



In 2015, NOAA Fisheries Southwest Fisheries Science Center (SWFSC) undertook a Collaborative Large Whale Survey (CLaWS) from 9 July through 9 November aboard NOAA Ship Reuben Lasker. The survey was a collaborative effort between SWFSC and NOAA Fisheries Alaska Fisheries Science Center.
The study was conducted in U.S. and Canadian waters of the eastern North Pacific (ENP) between the Aleutian Islands, Alaska, and San Diego, California (Fig. 1). The survey was separated into five legs, ranging from 15 to 25 days. The fourth leg of the survey occurred in Canadian Pacific coastal waters between 28 September and 22 October and was a collaborative effort with Dr. John Ford of the Cetacean Research Program, Pacific Biological Station, Fisheries and Oceans Canada.


CLAWS = Collaborative Large Whale Survey.
Objective: photo ID study of the Pacific Coast Feeding Group (PCFG) of gray whales (Eschrichtius robustus) between central California and Kodiak, Alaska.
Vessel: NOAA Ship Reuben Lasker.
Study area: U.S. and Canadian waters of the Eastern North Pacific (ENP) between the Aleutian Islands, Alaska, and San Diego, California.

Supplemental information

SWFSC MMTD Cruise Number: 1648
Perpendicular distance will be released upon permission by the contributor. Please contact the contributor if needed.

Attribute descriptions for effort data:
dist: Length of the segment (km)
Mode: Effort mode type (C = closing mode; P = passing mode)




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)
eventS = marine mammal sighting; t = sea turtle sighting; p = pinniped sighting
datetimeDate and time of sighting (local time)
latLatitude (decimal degrees) of vessel when sighting was made
lonLongitude (decimal degrees) of vessel when sighting was made
cruiseSWFSC Marine Mammal and Turtle Divison Cruise number
sightnoSighting number (within Cruise)
nspNumber of species observed in the sighting
mixedTRUE for a multi-species sighting (nSp >= 2); FALSE otherwise (nSp = 1)
spcodeSpecies code
sp_tsnTaxonomic Serial Number added by OBIS-SEAMAP
gsspbestThe mean of all observers
gssphighThe mean of all observers
gssplowThe mean of all observers
perpdistkmPerpendicular distance (km) to sighting from trackline; Available upon permission.
bftBeaufort sea state, as assessed by looking upswell with the naked eye.
swellhghtAverage swell height from trough to crest of typical swells (estimated in feet, by eye)
visA measure of air/atmospheric clarity
groupsize_sightnoRunning count ID of all cetacean groups recorded (should be same as SightNo)
groupsize_countNumber of observers that provided a group size estimate (for calculating GsSpBest) for S events.
groupsize_count_obsNumber of unique observer codes per sighting for S events
geomGeometry field added by OBIS-SEAMAP
Marine mammals1,426
Sea turtles0
Rays and sharks0
Other species0
Non spatial0
Non species3
Date, Begin2015-07-10
Date, End2015-11-07
Temporal prec.111111
Latitude33.87 - 60.23
Longitude-155.36 - -119.51
Coord. prec.6 decimal digits
Data typeAnimal sighting
EffortYES (ID: 2146)
Traveled (km)9,831
Effort hours549
Contr. through
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