16 3 23 6 40 I 

 • • • • • • 



; Pelagic Juveniles 



Benthic Juveniles 



"■■■'I 'i ^' ^1 



Figure 7, — Number of specimens and location of capture of larvae and juveniles of Sebastes flavidus ofTOregon ( 1961-78) described in 



this paper. 



side of two specimens of S. melanops, 36 and 39 

 mm long.) The interopercular spine is present on 

 specimens >10 mm and persists as a sharp spine 

 to =71 mm on S. flavidus and —52 mm on S. 

 melanops. This spine becomes skin covered and 

 appears as a bump on large specimens. 



The ridge anterior to the postocular spine is 

 usually finely serrated on specimens - 16 mm in 

 S. flavidus and <22 mm in S. melanops. Preocu- 

 lar and supraocular spines never develop on 

 either species. The second inferior infraorbital 

 spine is visible as a bump at 10.3 and 11.7 mm on 

 S. flavidus and S. melanops, respectively, and as 

 a sharp spine by =12 mm on both species. A third 

 inferior infraorbital spine appears on both species 

 between 13.5 and 14.5 mm. The second and third 

 inferior spines are reduced to a pair of rounded 

 bony lobes on S. flavidus =36-67 mm and S. 

 melanops 33-50 mm long. Sebastes flavidus -67 

 mm and S. melanops >50 mm have a single fleshy 

 lobe which encases the bony lobes. The first 

 superior infraorbital spine is present through the 

 larval periods of both species and becomes re- 

 duced and then absent on S. flavidus >45 mm 

 and S. melanops -38 mm long. The fourth 

 superior infraorbital spine develops by =10 mm, 

 is present to =45-48 mm, and then is absent in 

 both species. The third superior infraorbital spine 

 appears on S. flavidus 15-35 mm and on S. 

 melanops 19-33 mm long. A second superior in- 

 fraorbital spine never develops. The nasal spine 

 appears as a bump between 11 and 12 mm and 

 becomes a sharp spine, between 12 and 13 mm, 

 which persists on all larger specimens of both 

 species. 



The tympanic spine never becomes well de- 

 veloped, appearing as a small bump on =24-63 

 mm S. flavidus and 30 to =40 mm S. melanops 

 and as a small spine on larger specimens. The 

 pterotic spine is present on all larvae <24 mm; is 

 usually a bump on specimens 24-41 mm; and is 

 absent on larger specimens. The inferior post- 

 temporal spine is reduced to a bump and then 

 absent on S. flavidus >67 mm and S. melanops 

 ■45 mm. The supracleithral spine and superior 

 posttemporal spine first appear at =11 or 12 and 

 = 19 or 20 mm, respectively, and persist in 

 benthic juveniles. These spines are scale covered 

 on benthic juvenile S. melanops >67 mm. The 

 cleithral spine usually appears as a bump at =24 

 mm in S. flavidus and at =30 mm in S. melanops. 

 Specimens -33 mm have a sharp spine which is 

 scale covered in larger juvenile and adult S. flav- 

 idus and S. melanops >67 mm long. 



Scale Formation. — Lateral line organs are visible 

 on transforming specimens 14.8 mm in S. flav- 

 idus and >17.2 mm in S. melanops, indicated by 

 a row of light colored spots on the flesh. Develop- 

 ing scales are first visible on unstained specimens 

 =23 or 24 mm long in the region above the pec- 

 toral fin, near the posttemporal and supracleithral 

 spines, and over the upper two-thirds of the body 

 in the postanal region. The body is scale covered by 

 =28 mm. 



Pigmentation. — The smallest larvae (10.1 and 

 10.6 mm) of both S. flavidus and S. melanops 

 have melanistic pigment on the head over the 

 brain. Melanophores are usually present on the 



912 



