YOUNG JACK CREVALLES 



403 



tional rates of increase for the two variates are 

 0.20-mm. (below 75 mm.) and 0.38-mm. (above 

 75 mm.) increase in pectoral length per 1.0-mm. 

 increase in standard length. 



Pelvic. — 1-5. The rays are well formed at 

 12.4 mm. standard length (fig. 34), and branching 

 has begun by 15 mm. (fig. 35). 



Body depth. — At corresponding body lengths the 

 depth at first anal spine averages less than the 

 depth at pelvic to about 35 mm. standard length, 

 approximately equals the latter from 35 mm. to 

 about 55 mm., and averages greater above 55 mm. 



The regression of body depth at pelvic on 

 standard length is shown in figure 41 and table 7. 

 Two lines were fitted to this regression: for speci- 

 mens from 12.4 to 23.1 mm. and from 23.1 to 106 

 mm. standard length. The lines intersect at 

 approximately 24 mm., indicating that an inflec- 



tion occurs at about that size and that a slower 

 body-depth growth rate prevails above that size. 

 The proportional rates of increase for the two 

 variates are 0.41 -mm. (below 24 mm.) and 0.29- 

 mm. (above 24 mm.) increase in body depth per 

 1.0-mm. increase in standard length. The coordi- 

 nates of the four specimens larger than 106 mm. 

 fall slightly below the extension of the calculated 

 regression line, but these data are insufficient to 

 indicate a possible decrease in body-depth growth 

 rate. 



Head. — The regression of head length on stand- 

 ard length is shown in figure 41 and table 7. A 

 line fitted to this regression for specimens from 

 12.4 to 118 mm. standard length shows a propor- 

 tional rate of increase for the two variates within 

 this size range (0.27-mm. increase in head length 

 per 1.0-mm. increase in standard length). The 



80 



70 



60 



2= 50 



x 

 \- 

 o 



3 40 



< 



tr 

 o 



h- 

 o 



UJ 

 Q_ 



30 



20 — 



"i — r 



i — r 



T — i — i — r 



-i — r 



n — r 



l — r 



10 



01 L 



i__J I 1_ 



i i i 



100 150 200 



STANDARD LENGTH IN MM. 



250 



Figure 40. — Caranx ruber: Relation of pectoral length to standard length. 



