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Sperm Whale Seismic
Study (SWSS)
Summer Breeze
Daily Reports - July 4,
2005
Position on 07/04/2005, 02:49
UTC; 29 07.656N; 087 04.487W
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We managed to track the group of
whales we had encountered yesterday throughout the night.
Fortunately, they made our job relatively easy, since they continued
to click regularly for most of the night, and pauses in
vocalizations were brief and far between.
At some point, we had tracked them that closely that we could
hear their blows somewhere to the starboard of our vessel. We
wondered what, upon hearing these strange sounds people in the old
days must have felt, not knowing what produced them… To us, these
blows indicated that we were literally on the right track.
The animals moved about 20 nautical miles in an
almost straight line towards the north-east. Once again, their
orientation mirrored that of the continental slope. Since we were
that close to the whales all night, we got the first ID photo just
after daylight, at 6:30 local time. |

Risso's Dolphin or "Grampus" is rarely seen
close-in in larger vessels - one of several
animals photographed from the Summer
Breeze. |
We worked with these whales all
day, obtaining 15 ID photos. They kept clicking and fluking
regularly all day, while continuing their north-eastward movement.
They did not join in groups and socialize at all while we were with
them today. After a first glimpse at the photos, we had five or six
animals in the area (several IDs show a very smooth fluke, which may
or may not belong to the same individual).
By 16:00 winds had increased to
above 20 knots, seas became too rough to continue staying with this
group and we decided to leave them. In light of the threatening
tropical storm to the south and west, we agreed on surveying
eastward. In contrast to our original plan to survey block 2 on this
leg, we will now work in block 1, since the group of whales has
taken us to the east already and to avoid the fringes of the storm
as much as possible. |