NEFSC 1995 AJ9501 (Part I)

NOAA Northeast Fisheries Science Center (NEFSC)

Dataset credit

National Marine Fisheries Service


Primary contact Debi Palka NOAA Northeast Fisheries Science Center
Data entry Benjamin Best Duke University



The ship survey was performed from 22 July 1991 to 30 August 1991 to estimate the abundance and spatial distribution of harbor porpoises. The study area, covering approximately 13,300 nm, was from Port Clyde, Maine to St. John, New Brunswick over to the Nova Scotian coast, up to Liverpool, Nova Scotia.


The primary objectives were:

1) Estimate the abundance of harbor porpoises in the Gulf of Maine - Bay of Fundy - Nova Scotia area; and

2) Investigate if there are any spatial distribution patterns of the harbor porpoises, and if those patterns are correlated with water depth or harbor porpoise group size.

The secondary objectives were:

1) Estimate the abundance and spatial distribution of other cetaceans;

2) Determine if harbor porpoise avoid this ship, and if so, at what distance;

3) Determine if there is a spatial distribution pattern of mother-calf pairs of harbor porpoise;

4) Compare the abundance estimate and spatial distribution of harbor porpoise as seen this year with that seen in previous years;

5) Investigate if inland bays can be surveyed using a rigidhull inflatable boat as the observation platform in a line transect survey; and

6) Determine if Buckland's sighting procedure (1991), which is a line transect survey using both a primary and marking team, is a feasible procedure to estimate the abundance of harbor porpoise in the Bay of Fundy area.

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.


Potter, D., National Marine Fisheries Service. 1991. Cruise report of the harbor porpoise survey. Cruise report. 1991 AJ91-02.



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
cruiseCruise number designated by NEFSC
yeardefinition not provided
monthdefinition not provided
daydefinition not provided
timeTime when the record was recorded
latLatitude in decimal degrees
longlongitude in decimal degrees
speciesCode of species sighted
sizeHerd size
transectTransect no.
legLeg no.
col_11definition not provided
geomdefinition not provided
oiddefinition not provided
Marine mammals150
Sea turtles0
Rays and sharks0
Other species0
Non spatial0
Non species0
Date, Begin1995-07-11
Date, End1995-08-01
Temporal prec.111111
Latitude36.58 - 39.31
Longitude-74.16 - -68.36
Coord. prec.3 decimal digits
Data typeAnimal sighting
EffortYES (ID: 57)
Traveled (km)2,143
Effort hours130
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