macrochir, is deeper bodied than the North 

 American species and has a relatively narrower 

 caudal peduncle. Counts of its spinous dorsal rays 

 and vertebrae are close to those of S. altivelis. 



Hubbs ( 1926), Barsukov ( 1964), and Miller and 

 Lea (1972) have given information on the 

 bathymetric ranges of the adults. In summary, S. 

 altivelis occurs typically at 550 to 1,300 m with 

 known depth extremes of 200 to 1,550 m. Every- 

 where along its latitudinal range S. altivelis is 

 deeper living thanS. alascanus, although there is 

 some overlap and the two species are occasionally 

 taken in the same trawls. Sebastolobus alascanus 

 commonly occurs at 180 to 440 m, with known 

 depth extremes of 18 to 1,524 m. Sebastolobus 

 macrochir occurs commonly at 400 to 640 m. 



MATERIALS AND METHODS 



Larvae of Sebastolobus from 2 yr (1960, 1966) 

 of CalCOFI survey cruises were identified and 

 counted. From these a developmental series that 

 encompassed the entire larval period was estab- 

 lished. Larvae of this series were measured with 

 the ocular micrometer of a stereoscopic micro- 

 scope, according to the methods of Moser (1967, 

 1972), to produce the tables of morphometries 

 (Tables 1-3) needed for comparison of body pro- 



FISHERY BULLETIN: VOL. 72, NO. 4 



portions of S. altivelis and S. alascanus. This 

 series also provided the specimens needed to de- 

 scribe the general morphology and melanophore 

 pattern of the larvae. Measurements of four 

 pelagic juveniles of S. macrochir are given in 

 Table 4. An abbreviated series of S. altivelis and 

 S. alascanus was selected, cleared with a graded 

 series of KOH-glycerin solutions and stained 

 with Alizarin Red-S to produce tables of meristics 

 (Tables 5, 6). 



The pelagic juvenile stages of the two species 

 were obtained from the mid-water trawl collec- 

 tions of the Los Angeles County Museum of 

 Natural History (LACM), the Scripps Institution 

 of Oceanography (SIO), and the Southwest 

 Fisheries Center. Demersal juveniles were ob- 

 tained from otter trawl collections of LACM and 

 SIO. As for larvae, series of juveniles were estab- 

 lished for analysis of morphometries (Tables 2-4), 

 pigment pattern, and meristic characters (Tables 

 5, 6). In this paper the term "body length" refers 

 to the distance from the snout to the tip of the 

 notochord in larvae which have not yet formed 

 the caudal fin. After dorsad flexion of the tip of 

 the notochord and completion of caudal fin forma- 

 tion "body length" refers to standard length (dis- 

 tance from snout to posterior edge of hypural 

 plate). 



866 



