RICHARDSON and LAROCHE; DEVELOPMENT AND OCCURRENCE OF ROCKFISHES 



Table 12.- 



-Development of spines in the head region o(Sebastes helvomaculatus larvae and juveniles. Specimens above dashed 

 line are undergoing notochord flexion. + denotes spine present and - denotes spme absent. 



8.8 

 9.9 

 10.9 

 '12.0 

 '12.0 

 '13.4 

 '13.4 

 '13.6 

 '17.8 

 '17.9 

 '18.4 

 '18.4 

 '18.6 

 =19.8 

 '20.3 

 321.6 

 322.1 

 322.2 

 322.4 

 323.8 

 341.6 



'136-4 



'183 



+ + 







+ + 







+ + 



+ + 



9.9 



10.9 

 '12.0 

 '12.0 

 '13.4 

 '13.4 

 '13.6 

 '17.8 

 '17.9 

 '18.4 

 '18.4 

 '18.6 

 319.8 

 320.3 

 321.6 

 322.1 

 322.2 

 322.4 

 323.8 

 341.6 



'136.4 



'183 



I}) 

 I}) 





-(') 





(') 





'Transforming 



^Bump indicating beginning of spine formation 



^Pelagic juvenile 



'Benttiic juvenile 



ion, transforming, and pelagic juvenile stages. 

 The nuchal and parietal spines are fused together 

 by the time juveniles are 42 mm long. 



The posterior preopercular spine series is prom- 

 inent in S. helvomaculatus larvae. The third spine 



of the series is weakly serrated in larvae >8 mm 

 up to pelagic juveniles. It is relatively long in 

 larvae averaging 27 to 31'7f HL in flexion and 

 postflexion stages. Its length decreases to 2'7f in 

 benthic juveniles when it is no longer serrated. 



35 



