134 University of California Puhlications in Zoology ["Vol. 13 



TABLE 9 



Distribution of Euphausia at the Sukface, by Two-Hour Periods Through the Day, 



FOR THE Summer Months 



Time of 



Day 



A.M. 



1. 6- 8 



No. 

 Total 

 A 



29 



of hauls : 

 Success. 

 B 







No. of hours: 

 Total Success. 

 C D 



20.4 



No. of 

 Total 

 E 







animals : 

 Per hour 

 F 







Frequency : 



Haul Time 



G H 







2. 8^10 



24 







22.3 























3. 10-12 



19 







11.5 























P.M. 



















4. 12- 2 



16 







11.0 























5. 2- 4 



10 







5.25 























6. 4- 6 



10 







6.6 























7. 6- 8 



26 



2 



15.2 



0.8 



161 



10.6 



8 



5 



8. 8-10 



7 



1 



3.8 



0.4 



8 



2.1 



14 



11 



9. 10-12 



1 







1.1 



2.8 



















A.M. 



















10. 12- 2 



2 































11. 2- 4 



10 



3 



8.0 



3 



16 



2.0 



30 



37 



12. 4- 6 



35 







26.0 























months alone do not provide for judging whether it takes place or 

 not. The Kofoid nets took only 17 Euphausias during the summer, 

 while the Nansen nets took five, and the surface nets obtained very 

 few animals during the months when the surface net captured many. 

 It is possible to show, however, that there is some evidence for the 

 occurrence of vertical movements, in the results of collecting with the 

 Kofoid and Nansen nets. Table 10, which follows, treats of the dis- 

 tribution of Euphausia during the winter, as shown by collections with 

 the Kofoid net. 



TABLE 10 



Distribution of Euphausia at Different Levels and at Different Times of Day 

 AS Shown by the Kofoid Net; Winter Months 





Depth in meters 





A 



6 A.M.-6 P.M 



A 







B 



2 A.M-6 a.m. 



A 







9- 



100 



1 



101- 



200 



2 



201- 

 400 

 3 



401 + 

 4 



9- 



100 



1 



101- 

 200 



2 



201- 

 400 

 3 



^ 



401 + 

 4 



1. 



Total hauls 



50 



17 



13 



7 



3 















2. 



Successful hauls 



2 



2 



4 



1 



3 















3. 



Total hours 



9.0 



3.6 



2.9 



1.7 



0.65 















4. 



Successful hours 



0.65 



; 0.4 



0.9 



0.25 



0.65 















5. 



Total animals 



4 



11 



28 



1 



334 















6. 



Animals per hour 



0.3 



3 



10 



0.6 



515 















7. 



Haul frequency 



4 



12 



31 



14 



100 















8. 



Time frequency 



7 



11 



31 



15 



100 















