Harbor Porpoise Survey 1992 (AJ92-01)

NOAA Northeast Fisheries Science Center (NEFSC)

Dataset credit

NOAA Northeast Fisheries Science Center (NEFSC)


Primary contact Debi Palka NOAA Northeast Fisheries Science Center
Data entry Ei Fujioka Duke University



The ship survey was performed from 29 July 1992 to 06 September 1992,
starting and ending in Woods Hole, MA. The study area, covering approximately 13,300 nmi2, was from Portland, ME to St. John, New Brunswick over to Port Joli, Nova Scotia on the southeast side of Nova Scotia.


Estimate the abundance of harbor porpoises in the Gulf of Maine - Bay of Fundy - Scotian shelf

1) Determine the spatial distribution patterns of harbor porpoises, and investigate if the patterns are correlated with hydrographic or biological features, such as, the depth, temperature or salinity of the water or with targets seen on an acoustic fish finder.
2) Estimate the abundance and spatial distribution of other cetaceans.
3) Determine if harbor porpoise avoid this ship, and if so, at what distance.
4) Use a 17 foot Zodiac rigid-hulled inflatable boat (RIB) and the R/V Abel-J to survey the Penobscot Bay - Blue Hill Bay area and other bays and harbors along the Maine and Nova Scotia coast.
5) Determine if there is a spatial distribution pattern of mother-calf pairs of harbor porpoise.
6) Compare the abundance estimate and spatial distribution of harbor porpoise as seen this year with that seen in previous years.
7) Determine dive time patterns of individual and groups of harbor porpoises around the sighting platform.
8) Investigate the utility of 2 new electronic data entry systems.
9) Determine the distribution of marine mammals between the northeastern edge of the study area and Halifax, Nova Scotia, on Brown' s Bank, and on the continental shelfbreak in the area south of Brown' s Bank.

Supplemental information

In addition to the sighting data, effort data was recorded every half hour or whenever conditions change.
This dataset, therefore, should be used with the effort data.


David Potter, National Marine Fisheries Service. 1992. CRUISE REPORT OF THE HARBOR PORPOISE SURVEY - 1992; AJ92-01.



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
datasetDataset name
linenoLine number
cruiseCruise number designated by NEFSC
dateDate when the record was recorded
timeTime of the observation (local time)
latitudeLatitude in decimal degrees
longitudeLongitude in decimal degrees
speciesCode of species sighted
commonSpecies common name.
tsnITIS Taxonomic Serial Number added by OBIS-SEAMAP
scientificSpecies scientific name
group_Group name the species belongs to
rankRank such as species, genus and family
herdsizeAn estimate of the number of individuals.
transectTransect no.
legLeg no.
excludedFor internal use
geomGeometry field added by OBIS-SEAMAP
oidUnique ID number (generated by OBIS-SEAMAP)
Marine mammals1,238
Sea turtles1
Rays and sharks14
Other species7
Non spatial0
Non species0
Date, Begin1992-07-31
Date, End1992-09-05
Temporal prec.111111
Latitude42.47 - 45.04
Longitude-69.96 - -64.71
Coord. prec.3 decimal digits
Data typeAnimal sighting
EffortYES (ID: 303)
Traveled (km)3,292
Effort hours193
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