15 



X ,0 

 o 



Q. 

 CO 



< 

 CO 



CE 

 O 

 Q 



Q 



cr 



YOUNG JACK CREVALLES 



— i 



427 



-r 



~r 



-r 



5 — 



25 



50 75 



STANDARD LENGTH IN MM 



100 



125 



Figure 3. — Comparison of the regression lines for the relation of length of the third dorsal spine to standard length 



for five species of Caranx. 



A composite graph of the regression lines for 

 length of the first dorsal soft-ray on standard 

 length of the five common species is shown in figure 

 5. The species can be adequately compared be- 

 tween about 32 mm. and 83 mm. standard length. 

 C. latus apparently has the fastest soft-ray growth 

 rate and ruber the slowest (0.21-and 0.12-mm. in- 



STANDARD LENGTH IN MM. 



Figure 4. — Caranx crysos, Caranx sp. ("latus and/or 

 hippos"), and C. bartholomoei: Relation of length of 

 the second anal spine to standard length for specimens 

 smaller than 10 mm. standard length. 



crease in soft -ray length, respectively, per 1.0-mm. 

 increase in standard length). ( '. h ippos apparently 

 averages the greatest soft-ray length at comparable 

 body lengths to about 80 mm. where it is equaled 

 and at a larger size exceeded by latus. Above ap- 

 proximately 38 mm., ruber apparently averages the 

 least soft-ray length at comparable body lengths. 



The greater average length of the first soft-ray 

 of latus and hippos above approximately 50 mm. 

 standard length (fig. 5) expresses the more pro- 

 nounced fin lobe of these two species as compared 

 with that of crysos, ruber, and bartholomaei. The 

 lobe of lugubris may be even more pronounced 

 (fig. 98). C. dentex differs from the other six 

 species in lacking a distinct lobe, and in having 

 the third dorsal spine longer than the first dorsal 

 soft-ray (figs. 25 and 97). 



Anal soft-rays. — C. latus, hippos, and lugubris 

 are separable from bartholomaei, dentex, and ruber 

 by the lesser number of anal rays; crysos overlaps 

 these two groups (fig. 1). A trend of direct rela- 

 tion between numbers of dorsal and anal soft- 

 rays is shown for these members of the genus. 

 The same intraspecific relationships of the lengths 

 of the first and second soft-rays and interspecific 



