790 
Fishery Bulletin 96(4), 1998 
Figure 1 
Developmental series of grass rockfish, Sebastes rastrelliger. (A) 4.6 mm SL yolksac preflexion larva; (B) 
7.2 mm SL flexion larva; (C) 10.0 mm SL larva; (D) 13.8 mm SL larva; (E) 18.3 mm SL larva; (F) 21.6 mm 
SL transforming larva; (G) 27.7 mm SL pelagic juvenile. Illustrations A and B (4.6 and 7.2 mm SL, respec- 
tively) from Moreno, 1993. 
length. After transformation, the fish became more 
thick-bodied, as evidenced by the increase in body depth 
at the pectoral-fin ray base and at the anus. 
Head spination 
Several head spines had already developed by a 
length of 10.0 mm (Table 3). The nasal, postocular, 
parietal, nuchal, pterotic, inferior posttemporal, 
supracleithral, operculars, and preoperculars were 
all well formed, whereas the 1st inferior and 1st su- 
perior infraorbital were barely perceptible at 10.0 
mm. By 13.8 mm, the preocular, 2nd inferior infraor- 
bital, and the superior posttemporal were developed. 
At 18.8 mm, the 4th superior infraorbital was formed. 
The tympanic formed at 19.7 mm. The pterotic be- 
came overgrown and embedded by 21.6 mm. The 
supraocular, coronal, 3rd inferior infraorbital, and 
2nd and 3rd superior infraorbital were not apparent 
at any length examined. 
Body pigmentation 
A distinct pattern of heavy dorsal and postanal ven- 
tral midline pigment, along with strong lateral mid- 
line pigment, was characteristic at a length of 10.0 
