RICHARDSON and LAROCHE: DEVELOPMENT AND OCCURRENCE OF ROCKFISHES 



Scale Formation. — Lateral line pores are visible 

 on transforming specimens >18.2 mm. Develop- 

 ing scales are first visible on unstained specimens 

 =20 mm on the posterodorsal region of the head 

 and anterodorsal region of the trunk above the gut 

 cavity. Scale development proceeds posteriorly 

 with the body being covered by 29 mm. 



Pigmentation. — Melanistic pigment on 8.0 mm 

 specimens of S. crameri (similar to the 9 mm 



specimen illustrated) is present on the head over 

 the brain. Melanophores line the inside tip of the 

 lower jaw and may also be present along the an- 

 teroventral margin of the maxillary. In the ab- 

 dominal region interna! melanophores are dense- 

 ly concentrated on the dorsal surface of the gut and 

 more sparsely distributed laterally and ventrally. 

 Additional external melanophores are present on 

 the body wall over the gut cavity. A heavy con- 

 centration of external melanophores and some in- 



TABLE 6. — Development of spines in the head region o^ Schastcs crameri larvae andjuveniles. Specimens above dashed line are 

 undergoing notochord flexion. + denotes spine present and - denotes spine absent. 



Standard 

 length 

 (mm) Parietal Nuctial 



Preopercular 

 (anterior series) 



Preopercular 

 (posterior series) 



Opercular 



5tti Supenor Interior cular 



(') 



V) 



'Bump indicates beginning of spine formation. 



^Transtorming 



^Pelagic )uvenile 



^Benthic juvenile 



^Parietal and nuchal spines fused 



^Spine IS bifid 



15 



