WhaleNet
Harbor Porpoise
Satellite Data
New England Aquarium
"Brewster" History

Stranded on May 20,2002, in Brewster, MA. He was rescued from the beach by the Cape Cod Stranding Network (CCSN) and transported to the New England Aquarium's facility in Duxbury, MA for prompt treatment and rehabilitation.

Upon arrival, he was found to be 116-cm (about 1 year old), underweight (25 kg), dehydrated, lethargic, and with inflamed lesions over much of his body. The most severe lesions were found on both sides of the tailstock - most likely resulting from bite wounds, which left him unable to move his tail properly. He also had a respiratory infection, as revealed through coughing ("chuffing") and chest radiographs, and a heavy burden of internal parasites (lungworms, tapeworms, and roundworms).

Over the course of his 4.5 month stay, "Brewster" made tremendous progress. Prior to release, he was robust, strong, and able to catch live fish. He measured 132 cm and weighed 35 kg or 78 pounds.

RELEASE - On October 9, 2002, 2002 he was taken to the waters just northwest of Stellwagen Bank and released (42 28.567 N and 70 39.133 W).

Sighting Data
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Harbor porpoises (Phocoena phocoena) tagged and released by researchers with the New England Aquarium.


Satellite Fixes

Data Format key:
Date (dd.mm.yy): 22.08.98 23:06:55 Time (hr:min:sec)(in GMT), LC (fix quality)

LC just stands for Location Class. Location Classes of 0 and up are the best (derived from 4 or more messages)- a Class 0 is good to within between 1,000 and 5,000 meters. Classes 1,2,3- get consistently more accurate. The letter classes are given no estimate of error, but the A's are better than the B's etc. (Argos Accuracy Table) It appears that some of the letter class locations are pretty good (i.e. several fixes over a short period are quite similar), but then others vary wildly- especially the longitude.

> Lat1: 48.275N [latitude] Lon1: 69.232W [longitude]

"Brewster" Data

27572 Date : 09.10.02 RELEASE Lat1 : 42.476N Lon1 : 70.652W
27572 Date : 09.10.02 14:48:52 LC : A IQ : 07 Lat1 : 42.467N Lon1 : 70.770W
27572 Date : 09.10.02 15:13:20 LC : 0 IQ : 58 Lat1 : 42.471N Lon1 : 70.811W
27572 Date : 09.10.02 16:53:24 LC : 1 IQ : 56 Lat1 : 42.434N Lon1 : 70.841W
27572 Date : 09.10.02 16:54:51 LC : A IQ : 08 Lat1 : 42.517N Lon1 : 70.792W
27572 Date : 09.10.02 13:06:59 LC : 2 IQ : 58 Lat1 : 42.456N Lon1 : 70.696W
27572 Date : 09.10.02 16:53:24 LC : 1 IQ : 56 Lat1 : 42.434N Lon1 : 70.841W
27572 Date : 10.10.02 14:33:01 LC : 1 IQ : 58 Lat1 : 42.581N Lon1 : 70.658W
27572 Date : 11.10.02 14:19:55 LC : 0 IQ : 46 Lat1 : 42.814N Lon1 : 70.576W
27572 Date : 12.10.02 13:49:56 LC : 0 IQ : 56 Lat1 : 43.079N Lon1 : 70.437W
27572 Date : 15.10.02 16:43:54 LC : 2 IQ : 60 Lat1 : 43.088N Lon1 : 70.389W

TrackMap "Brewster"


Additional and more complete data is available in the WhaleNet listerv.


Analysis Tools

Sample Questions and Activities--

1. How far do harbor porpoise travel a day? (Average)
2. How far did they travel since their initial tagging?
3. Why do you think they are traveling in a particular direction?
4. Why do whales/porpoises migrate?
5. What is the average rate of travel?
6. What other questions do you have regarding "Tab"?
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