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FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



Figure 24. — Caranx crysos: Preopercular spines of a 14- 

 mm. specimen, showing measurement (a) of the length 

 of the preopercular-angle spine. 



length is shown in figure 26 and table 3. Two 

 lines were fitted to this regression: for specimens 

 from 7.0 to 58.5 mm. and from 58.5 to 266 mm. 

 standard length. An extension of the lower line 

 intersects the upper line at approximately 70 

 mm., indicating that an inflection occurs at about 

 that size and that a faster pectoral growth rate 

 prevails above that size. The proportional rates 

 of increase for the two variates are 0.195-mm. 

 (below 70 mm.) and 0.41-mm. (above 70 mm.) 

 increase in pectoral length per 1.0-mm. increase 

 in standard length. 



Pelvic. — 1-5. The pelvic fin has formed by 

 5.4 mm. standard length (fig. 17), but. the 6 rays 

 are not distinguishable below about 6.2 mm. 

 (fig. 18). Branching has begun by about 15 mm. 



Body depth. — At corresponding body lengths 

 the depth at first anal spine averages less than the 



depth at pelvic from 16.1 to about 40 mm. 

 standard length, approximately equals the latter 

 to about 75 mm., and averages greater above 

 75 mm. The body depth at pelvic for specimens 

 smaller than 10 mm. is illustrated in figure 9. 



The regression of body depth at pelvic on stand- 

 ard length is shown in figure 27 and table 3. 

 Two lines were fitted to this regression: for 

 specimens from 5.4 to 22.9 mm. and from 22.9 

 to 88.0 mm. standard length. The lines intersect 

 at 23 mm., indicating that an inflection occurs 

 at about that size and that a slower body-depth 

 growth rate prevails above that size. The pro- 

 portional rates of increase for the two variates 

 are 0.41-mm. (below 23 mm.) and 0.29-mm. 

 (above 23 mm.) increase in body depth per 1.0- 

 mm. increase in standard length. The majority 

 of the coordinates larger than 150 mm. fall below 

 the extension of the calculated regression line, 

 indicating a possible further decrease in body- 

 depth growth rate somewhere above that size. 



Head. — The nostril becomes divided at about 

 8 mm. standard length (figs. 17 to 19). The 

 serrations on the supraoccipital crest persist to 

 about 7 mm. (figs. 17 and 18). Three postero- 

 lateral^- projecting spines are located on the 

 cleithrum just below its junction with the oper- 

 culum at 5.4 mm. (fig. 17); 1 to 2 similar spines 

 occur on specimens 5.6 to 7.5 mm.; and none is 

 present at 8.5 mm. or above. 



The regression ot head length on standard 

 length is shown in figure 27 and table 3. Two 

 lines were fitted to this regression: for specimens 

 from 5.4 to 22.9 mm. and from 22.9 to 88.0 mm. 

 standard length. The lines intersect at approxi- 

 mately 22 mm., indicating that an inflection 

 occurs at about that size and that a slower head 

 growth rate prevails above that size. The pro- 

 portional rates of increase for the two variates 

 are 0.35-mm. (below 22 mm.) and 0.26-mm. 

 (above 22 mm.) increase in head length per 1.0- 

 mm. increase in standard length. The coordinates 

 of specimens larger than 88 mm. fall above the 

 extension of the calculated regression line, indi- 

 cating an increase in the head growth rate at 

 around that size. 



Eye . — The regression of eye diameter on stand- 

 ard length is shown in figure 28 and table 3. 

 Two lines were fitted to this regression: for 

 specimens from 5.4 to 30.3 mm. and from 30.3 

 to 145 mm. standard length. An extension of 



