SWFSC Marine Mammal Survey, CAMMS 1991, Cruise 1426

NOAA Southwest Fisheries Science Center (SWFSC)

Dataset credit

NOAA Southwest Fisheries Science Center (SWFSC)


Primary contact Jay Barlow NOAA Southwest Fisheries Science Center
Secondary contact Jeffrey Moore Southwest Fisheries Science Center, NOAA
Data entry Benjamin Best Duke University



This 1991 line-transect survey was designed to make abundance estimates for the cetacean species commonly found in California waters and killed in commercial gill net fishing operations. This survey was conducted by the NOAA Southwest Fisheries Science Center aboard NOAA Ship McArthur for a total of approximately 10,000 kilometers surveyed from late July to early November 1991. This dataset provides the time-date and geographical
coordinates, by species/stock, of all cetaceans detected during the survey, as well as the daily and intra-daily start and end points of the line-transect survey.


The primary purpose of the cruise was to estimate the abundance and understand the distribution of dolphin and whale species that inhabit California waters and are killed in United States commercial gill net fishing operations.

Supplemental information

SWFSC MMTD Cruise Number: 1426
Perpendicular distance will be released upon permission by the contributor. Please contact the contributor if needed.




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)
eventEvent code. S = cetacean 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 only, as affected by observational conditions such as fog, rain, etc.
groupsize_sightnoRunning count ID of all cetacean groups recorded
groupsize_countNumber of observers that provided a group size estimate
groupsize_count_obsNumber of unique observer codes per sighting for S events
geomGeometry field added by OBIS-SEAMAP
Marine mammals1,014
Sea turtles0
Rays and sharks0
Other species0
Non spatial0
Non species9
Date, Begin1991-07-28
Date, End1991-11-05
Temporal prec.111111
Latitude30.89 - 42.05
Longitude-129.95 - -117.44
Coord. prec.6 decimal digits
Data typeAnimal sighting
EffortYES (ID: 208)
Traveled (km)10,426
Effort hours516
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