Table ii.- 

 from the 



FISHERY BULLETIN: VOL. 78, NO. 2 



-Vertical distribution (percentage of stage at depth) of larvae and adults of Euphausia eximia in day and night samples 

 California Current terminus off the mouth of the Gulf of California (Station 10) and number/1,000 m^ in each stage. 



Table 12. — Vertical distribution (percentage of stage at depth) of larvae and adults of Euphausia eximia in day and night samples 

 from the South Equatorial Current (Station 21) and number/1,000 m^ in each stage. 



sinking of calyptopes and early furcilia larvae; 

 almost the entire population remained in the sur- 

 face layer until furcilia III. Diurnal vertical mi- 

 gration again developed in the last half of the 

 furcilia phase. 



The pattern of vertical distribution at Station 21 

 in the South Equatorial Current (Table 12) had 

 features in common with the distribution observed 

 at Station 6 but was less clearly defined. The posi- 

 tion of the calyptopes reflected a developmental 

 ascent from the depth at which eggs had hatched; 

 calyptopis I was more abundant in the surface 

 layer during the day than at night, and there was 

 also some evidence of nighttime sinking in calyp- 

 topis II and III. In the furcilia phase the pattern of 

 vertical migration was modified in that the larvae 

 appeared to avoid the surface 0-35 m stratum to 



332 



some extent. The population structure differed 

 with calyptopis II being the most abundant larval 

 stage. 



The differences in larval vertical distribution 

 appeared not to be related to time of sampling; in 

 the upper 150-200 m, where most of the larvae 

 were found, the three night samples were taken 

 between 0000 and 0030 and the day samples in 

 midaftemoon (1600) at Stations 6 and 21 and 

 midmorning (0800-0900) at Station 10 (Brinton 

 1979, figure 3). 



DISCUSSION 



The species of Euphausia were separated into 

 groups, characterized by adult armature of 

 carapace, abdomen, antennule, and petasma, by 



