462 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



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100 150 200 



STANDARD LENGTH IN MM. 



250 



300 



Figure 39. — Caranx ruber: Relation of length of the first dorsal soft-ray and of the third dorsal spine to standard length. 



standard length; above 25 mm., the dorsal ray 

 averages the greater length. The second anal 

 spine averages slightly more than one-half the 

 length of the longest anal ray to about 75 mm., 

 and only about one-third at 169 mm. and 246 mm. 



Interneural and interhemal spines. — Posterior 

 lateral projections of these spines are not extended 

 above the body surface (as occurs in latus and 

 hippos). 



Caudal. — 9 + 8 principal rays; about 7 to 9 + 7 

 or 8 secondary rays. The principal rays are all 

 segmented, branching has occurred, and forking 

 of the tail is pronounced at 12.4 mm. (fig. 34). 

 Branching is pronounced at about 15 mm. (figs. 

 35 and 36). 



Pectoral. — 1-18 to 21. The full complement of 

 rays is formed at 12.4 mm. standard length (fig. 

 34). Branching has begun by 25 mm. The 

 distal end of the fin is rounded from 12.4 mm. to 

 about 35 mm., above which it becomes pointed 

 and falcation begins (figs. 34 to 37). Falcation 

 is pronounced by 83 mm. 



The regression of pectoral length on standard 

 length is shown in figure 40 and table 7. Two 

 lines were fitted to this regression: for specimens 

 from 12.4 to 74.5 mm. and from 74.5 to 230 mm. 

 standard length. The lines intersect at approxi- 

 mately 75 mm., indicating that an inflection occurs 

 at about that size and that a faster pectoral 

 growth rate prevails above that size. The propor- 



