MOSER: DEVELOPMENT AND DISTRIBUTION OF SEBASTOLOBUS 



Figure 4. — Developmental stages of Sebastolobus altivelis. Above, 53.5-mm late pelagic juvenile from mid-water trawl. Below, 53.0- 



mm benthic juvenile from bottom trawl. 



occurs in 40.0- to 56.0-mm specimens and early 

 benthic juveniles average 38'7c . Virtually the 

 same changes in relative head size occur in S. 

 alascanus. 



The eyes of early-stage Sebastolobus larvae are 

 relatively smaller than in Sebastes larvae of com- 

 parable size. Eye diameter averages 26% of the 

 head length for larvae up to the beginning of 

 notochord flexion, 27% during flexion, and 28% in 

 post-flexion larvae up to 10.0 mm in length. 



Sebastes larvae average 33 to 35% during com- 

 parable stages. Eye diameter in larvae and pelagic 

 juveniles of S. altivelis 10.0- to 56.0-mm range) 

 averages 31% of the head length, while in those of 

 S. alascanus, eye diameter is slightly larger 

 (mean 33%). In early benthic juveniles of both 

 species, relative eye diameter increases sharply to 

 a mean of 38% of head length. The snout is rela- 

 tively short in pre-flexion larvae o( Sebastolobus 

 where snout length averages 27% of head length. 



875 



