37 



36 



35 



34 



33 



32 



31 



30 



29 



27 



26 



34 33 32 3 1 30 29 28 27 26 25 24 23 22 



o 



I 



SEfiLS PER HOUR^ 

 



1 TO 2.0 



2 1 TO 5.0 



5,1 TO 9 9 

 10 OR MORE 



Figure 18. — Number of seals seen per hour of effort in each square (areal unit) occupied by a research vessel In 

 August 1968 In Alaska waters near the eastern Aleutian Islands, The sides of each square measure 18.52 km. (10 

 nautical miles). Squares occupied for less than 0.5 hours are marked "X." 



43 



