EARLY DEVELOPMENT OF THE TEN-POUNDER 



639 



Table 10. — Measurements used in calculating regressions 

 of body parts on standard length, arranged by specimen 

 size and stage of development 



[Measurements in millimeters] 



Table 10. — Measurements used in calculating regressions 

 of body parts on standard length, arranged by specimen 

 size and stage of development — Continued 



[Measurements in millimeters] 



1 Either leptocephalus or an early metamorphic larva. 



period, and to a juvenile size of 138 mm., the head 

 increases 0.294 mm. per millimeter increase in 

 standard length. The extension of this regression 

 line beyond 138 mm. suggests an inflection at about 

 120 mm., and that the rate of increase above 

 120 mm. is less than for smaller specimens. 



Eye diameter. — During the leptocephalus period 

 the eye diameter increases 0.015 mm. per milli- 

 meter increase in standard length (fig. 26, table 

 11). During the early metamorphic period the 

 increase is 0.002 mm. per millimeter decrease in 

 standard length. During the late metamorphic 

 period and juvenile period to 138 mm. it increases 

 0.069 mm. per millimeter increase in standard 

 length. The extension of the regression line be- 

 yond 138 mm. indicates a lower rate above 120 mm. 

 (as was seen in regression of head length on stand- 

 ard length). A curve might better fit the data 

 in the late metamorphic period to adult size range 

 since most of the values for specimens smaller than 

 50 mm. and larger than 120 mm, fall below the 

 calculated straight line. 



