Kendall et al.: Vertical distribution of eggs and larvae of Theragra chalcogramma 



545 



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E 100 



I 150 



200 



250 



i i i i i i 



4 5 6 7 



I I I I I I | I I ! I I I I I 



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i i i i i i i i i i i i i i i i i i i i i i i i i i 



105 1 1 O 115 1^0 125 



Day of year 



1 30 135 



Figure 2 



Eggs of walleye pollock, Theragra chalcogramma. Depth of occurrence 

 by day of year and tow series number. Mean and standard deviation 

 of the mean are shown for each tow. 



50 



E 100 



I 150 



200 



250 



i i i i i i i 



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I w- I I I i I I I 



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115 120 125 130 135 UO 145 



Day of year 



Figure 3 



Larvae of walleye pollock, Theragra chalcogramma. Depth of occur- 

 rence by day of year and tow series number. Mean and standard de- 

 viation of the mean are shown for each tow. 



When pollock larvae were first present in April as 

 hatchlings in the lower part of the water column, they 

 experienced temperatures of 4.9° to 5.3C (Fig. 8). 

 When the larvae first reached the upper part of the 

 water column they experienced lower temperatures 



(~3.6°C during series four), but temperature at the 

 mean depth of larval occurrence increased to about 

 5.7°C during series nine (Fig. 8). 



Temperatures during series nine decreased with 

 depth from about 6.2°C at the surface to just above 



