may expand to more than 200 yards, but the 
resulting slight overestimate is sore than 
FUR SEAL ii aa AREA NEAR JAPAN “alineed up cbeateatigne during ‘ecarh 
weather when many animals are undoubtedly 
overlooked. There was practically no dan- 
ger of ever counting the same seal twice 
because the cruising speed of the vessel 
was greater than that of a ewimming seal, 
and the course was constantly forward over 
previously unexamined waters. 
The total 
area ecanned in a day, therefore, is the 
product of the average latitudinal visi- 
bility of 200 yards, multiplied by the 
miles run. The observations are shown in 
fable E. 
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The data in Table E show an aver— 
age observed population density throughout 
the period of one seal per 2.1 square niles 
of sea surface. The ninimur was sero, ae 
on many days no seale were seen. These 
voyages never encountered the maximum den- 
sity of seals, because the area covered 
was linited and the field work was stopped 
before the season when the larger herds 
normally approach the coast. Catches re- 
ported by Japanese huntere later in spring 
during the war years show obviously higher 
densities than any encountered by the Eatu- 
ral Resources Section observers. 
If this 
average observed density be assumed to 
cover the entire area of 170,600 square 
miles, the wintering population would be 81,000 seals. Almost surely this estimate is 
far on the low side because of animale overlooked during rough weather and failure to en- 
counter the presumptive maximum densities. 
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Figure 13 
It probably represents the minimun. 
TABLE BE. ~ ITINSRARY AND OBSERVATIONS OF FUR SEALS 
FROM RISHO MARU, 1948-49 a/ 
Distance 
Traveled 
(miles) 
18 Dec 48 
21 Jan 49 
25 Jan 49 
29 Jan 49 
29 Jan 49 
3. Feb 49 
Off Fean-saki, Hokknido 
Uchiura-wan, Hokkaido 
Off Muroran, Hokkaido 
Muroran to Todohokke, Hokkaido 
Todohokke to Muroran, Hokkaido 
36 
11 Feb 49 
15 Feb 49 
17 Feb 49 
19 Feb 49 
21 Feb 49 
26 Feb 49 
2 Mar 49 
5 Mar 49 
6 Mar 49 
Muroran to Hakodate, Hokkaido 
Hakodate to Hachinohe, Honshu 
Muroran to Hachinohe, Honshu b/ 
Hachinohe to Ozuchi, Honshu 
Ozuchi to Hosoura, Honshu 
Hosoura to Onagawa, Honshu 
Onagawa to Onahama, Honehu 
Off Onahama, Honshu 
Off Onahama, Honshu 
Off Onahama, Honshu 

(Cont !a 
SCa0oc OO ONNWCAND bb 
