SWFSC Marine Mammal Survey, Vaquita 1997, Cruise 1608
NOAA Southwest Fisheries Science Center (SWFSC)

Dataset credit

Marine Mammal and Turtle Division, Southwest Fisheries Science Center, NMFS, NOAA


Primary contact Tim Gerrodette NOAA Southwest Fisheries Science Center
Data entry Ei Fujioka Duke University



The 1998 Vaquita Abudance Survey was a collaboration between the National Marine Fisheries Service and SEMARNAP’s Instituto Nacional de la Pesca (INP) of Mexico. This line-transect survey was designed to collect data to estimate the abundance of vaquita, or Gulf of California harbor porpoise. The study area was from the northern end of the Gulf of California south to about 30 degrees north latitude in waters less than 100 meters deep. This survey was conducted by the NOAA Southwest Fisheries Science Center aboard the NOAA ship David Starr Jordan for a total of 1,560 kilometers surveyed from mid-August to mid-September 1997. 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 objective was to collect data to estimate the abundance vaquita, or Gulf of California harbor porpoise.

Supplemental information

This dataset is supplemental to the following datasets:
SWFSC Marine Mammal Survey, Vaquita 2008, Cruise 1637


Jaramillo-Legorreta, A. M., L. Rojas-Bracho, and T. Gerrodette. 1999. A new abundance estimate for vaquitas: First step for recovery. Marine Mammal Science. 15(4):957-973.



Attributes described below represent those in the original dataset provided by the provider.
Only minimum required attributes are visible and downlodable online. Other attributes may be obtained upon provider's permission unless otherwise noted below.

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 in dataset provided

Attribute (table column)Description
Marine mammals627
Sea turtles1
Rays and sharks0
Other species0
Non spatial0
Non species2
Date, Begin1997-08-05
Date, End1997-09-18
Temporal prec.111111
Latitude22.84 - 31.52
Longitude-116.57 - -109.87
Coord. prec.2 decimal digits
Data typeAnimal sighting
EffortYES (ID: 1032)
Traveled (km)4,491
Effort hours359
Sharing policy CC-BY-NC (Minimum)
Also availalbe from iOBIS
See metadata in static HTML
See metadata in FGDC XML
See download history / statistics