RICHARDSON and LAROCHE: DEVELOPMENT AND OCCURRENCE OF ROCKFISHES 



Table 8. — Measurements (millimeters) of larvae and juveniles of Sebastes pinmger from waters off Oregon. Specimens above 



dashed Ime are undergoing notochord flexion. 



'Usually third or fourth in larvae, fifth or sixth in juveniles 



^Usually midfin 



^The second spine 



*Bump 



^Not formed 



^Forming 



'Transforming 



"Pelagic juvenile 



'Benthic juvenile 



The posterior series of preopercular spines are 

 prominent in S. pinmger larvae. The heavily ser- 

 rated third spine is relatively long averaging 32 

 to 34'7( HL in flexion and postflexion larvae. Its 

 relative length then decreses to 5^f in benthic 

 juveniles. All five spines of the series are present 

 in larvae >10 mm. Serrations are visible on the 

 second, third, and fourth spines until =29 mm. 



The first posterior preopercular spine is some- 

 times bifid in pelagic juveniles. The smaller first 

 and third spines of the anterior preopercular 

 series are also conspicuous on small larvae, but 

 decrease in prominence until they are no longer 

 visible in pelagic juveniles >26 mm. The second 

 anterior preopercular spine never becomes appar- 

 ent. 



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