MARINE MAMMAL OBSERVATIONS 
EAC 38 
Observations of marine mammals during this partial Eastern Grid 
Survey (northern half) -were few. Only two species of cetaceans and one 
or possibly two species of pinnipeds were logged. 
The cetaceans consisted of two groups of 6 -9 Killer Whales 
( Orcinus orca ) and two small groups of ca. 12 of Common Dolphins 
(Delphinus sp.). The latter were of interest as they were the offshore 
type we have noted with dorsal fins colored differently from the 
usually more inshore Delphinus . The only other locality where this 
offshore form occurs'is in Japanese waters. We are currently corre¬ 
sponding with Japanese cetologists about the color forms and distribu¬ 
tion of this genus in Japanese waters. 
Pinnipeds recorded were even fewer than the meagre assemblage of 
cetaceans in the Grid. 
The Northern Fur Seal ( Callorhinus ursinus ) was observed on five 
different occasions. Four of these observations were of single animals, 
with one sighting of two recorded. Another f'ur seal noted was possibly 
the Guadalupe Fur Seal ( Arctocepholus townsendi ). Two seal species and 
four dared seals were all single observations except for one sighting 
of two. 
Weather and sea conditions were such that marine mammals had to 
be relatively close to the ship to be seen. Large Baleen and Sperm 
Whales which have been sighted in the Grid throughout the year were not 
noted (possibly due to sea conditions). 
' GRID MARINE MAMMAL OBSERVATIONS 
24 March 1968 
1045 eared seal - 2, probably Northern Fur Seal 
1403 seal sp. - 1 
1426 seal sp. - 1 
1443 eared seal - 1, probably Northern Fur Seal 
1458 eared seal - 1, probably Northern Fur Seal 
1745 Killer Whale- - 6-9 
These Orcinus were in three groups with at least two 
per pod. Each group had one large male (ca. 25 ft.). 
