KENDALL and NAPLIN: DIEL-DEPTH DISTRIBUTION OF ICHTHYOPLANKTON 



Table 2.— Transformed i log,,, A' * 1 1 mean numbers of larvae per 100 m'' and f- values from analysis of variance for eight species 

 offish taken during the vertical distribution study of ichthyoplankton in the Middle Atlantic Bight, July 1974. 



0.05; -P = 0.01. 



1200 1500 1800 2100 OOOO 0300 0600 090O 



SAMPLING TIMES (EST) 



Figure 4. — Mean percentage (surface/4 m) of bluefish larvae in 

 the 4 m tow relative to those in the m tow (line) and percentage 

 of bluefish larvae with food in their guts (dashed line) by time of 

 day from the vertical distribution study of ichthyoplankton in 

 the Middle Atlantic Bight, July 1974. 



Table 3. — Mean standard lengths (millimeters) of bluefish 

 larvae taken at various times of day and depths during the 

 vertical distribution study of ichthyoplankton in the Middle 

 Atlantic Bight, July 1974. 



showed no increased net avoidance during day- 

 light, nor any difference in depth distribution 

 with size. The apparent lack of larval growth over 

 the 72-h sampling period may be related to the 

 difference between the drift of bluefish larvae and 

 that of our drogue. 



Since bluefish egg incubation takes about 48 h 



711 



