442 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



Figure 16. — Caranx sp. larva, 3.8 mm. standard length, 

 measured from tip of snout to vertical from tip of 

 urostyle (TJSNM 164486). It is suspected to be C. 

 crysos. 



Characters 



Dorsal spines. — VIII and I. All spines are well 

 formed at 5.4 mm. standard length (fig. 17). 



The fourth spine averages the greatest length to 

 about 37 mm.; above 37 mm., the third spine is 

 longest. An interspinous membrane connects the 

 first and second dorsal fins (eighth and ninth 

 spines) to about 90 mm. 



The regression of length of third dorsal spine on 

 standard length is shown in figure 25 and table 

 3. A line fitted to this regression for specimens 

 from 5.4 to 88.0 mm. standard length shows a 

 proportional rate of increase for the two variates 

 within this size range (0.13-mm. increase in spine 

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

 The majority of the coordinates of specimens 

 larger than 88 mm. fall above the extension of the 

 calculated regression line, indicating an increase 

 in the spine growth rate above this size. 



Anal sjiines. — II and I. All spines are well 



Figure 17. — Caranx crysos larva, 5.4 mm. standard length (Gill 3, Reg. 38). 



Table 3. — Caranx crysos: Statistics describing regressions of body parts on standard length 



x=mean of independent variable z 

 y = mean of dependent variable y 

 iv"=number of specimens 

 6=rate of increase of y 

 a = y-intercept of regression line 

 S?'X=standard deviation from regression (standard error of estimate) 



Independent variable z 



Dependent variable y 



Size range of 



specimens 



(mm.) 



St* 



Standard length. 



Do 



Do 



Do 



Do.. 



Do 



Do 



Do 



Do 



Do 



Do 



Dorsal-fin spine length (3d) . 

 Dorsal soft -ray length (1st).. 



Pectoral length _ 



...do 



Bodv depth 



do 



Head length 



do 



Eye diameter 



do 



Snout length 



5. 4-88. 



5. 6-83. 5 



7. 0-58. 5 

 58. 5-266 



5. 4-22. 9 

 22. 9-88. 



5. 4-22. 9 

 22. 9-88. 



5. 4-30. 3 

 30. 3-145 



5.4-145 



0. 358 

 .261 

 .244 



2. 321 

 .289 

 .565 

 .238 

 .332 

 .123 

 .414 

 .247 



